4.5.4 Regional Ozone Concentrations

Maximum ozone concentrations observed at several locations in the area are given in Table 4.5.4. With a slight reduction in 85Omb temperature to 2O°C, maximum surface ozone concentrations were somewhat below those observed on September 26. Piru, South Mt., Thousand Oaks and Moorpark were the only locations where the maximum hourly concentration exceeden the state standard. Average background ozone concentration, as measured during the aircraft spirals, was 5 pphm which is the same as found on September 26.

Time histories of the hourly ozone values for several stations are shown in Figure 4.5.2. Simi and Ojai reached their peak values about 13 PST. The main peak at Piru occurred slightly later. The hourly concentration plot for Piru suggests an early peak in agreement with Simi and Ojai and a later, more important peak which was associated with the marine layer intrusion, 2-3 hours after the peak temperature was reached. An aircraft soundi~g (Section 4.5.5) at Piru at 1458 PDT shows two ozone layers with a shallow marine layer contributing the peak ozone contributions beginning at 14 PST.

In contrast to the previous test days, the Ventura maximum ozone concentration occurred at 13-14 PST with a rather slow decrease until 19 PST. As noted in Table 4.5.4, Platform Grace had two identical peaks of 8 pphm each, at 11 and 15 PST. Concentrations associated with the second peak may have contributed to the slow decrease in ozone observed at Ventura in the late afternoon. The Pt. Hueneme, ozone concentrations, for example, peaked at 15-16 PST, similar to the previous tests.

All ozone stations shown in Fig. 4.5.2 show the usual indications of peak values from 12-13 PST which could be associated with sources in the coastal region. All stations except Simi, however, were strongly influenced by a late afternoon surge of ozone arriving from the offshore area.

4-81

10

10

pphm . 10

04 08 12 16 20 24 PST

Ojai

04 08 12 16 20 24 ?ST

Ventura

04 08 12 16 20 24 PST

Fig. 4.5.2a HOURLY OZONE CONCENTRATIONS - September 28,1980

4-82

10

10

10

pphm

Port Hueneme

04 08 12 16 20 24 PST

El Rio

04 08 12 16 20 24 PST

Moorpark

04 08 12 16 20 24 PST

10 Thousand Oaks

08 12 16 20 24 PST

Simi

04 08 12 16 20 24 PST

Fig. 4.5.2b HOURLY OZONE CONCENTRATIONS - September 28,1980

4-83

10

Table 4.5.4

Regional Maximum Ozone Concentrations (pphm)

September 28, 1980

Time of Max Wind Direction Time of Max Temp Location Max 03 (PST) at Ti me of Max (PST)

Pt. Conception 4 00-04,06-14, 300-030° 12 16-22

Goleta 7 13-14 150 14 Pl atform Hondo 5 12-16 117 Ojai Pi ru

10 12

13 14-16

295 240

12 12-13

Simi Valley South Mt.

7 12

13-14 17

280 340

14 11

Thousand Oaks 11 16 320 11 Moorpark El Rio

12 9

12-15 14

M M

M M

Ventura 7 13-14 225 09-11 Pt. Hueneme 6 15-16 270* 13-16* Pl at form Grace 8 11-15 169,240 17

Background 5

*Pt. Mugu

4.5.5 Aircraft Sampling

The air quality aircraft sampled on September 28 along the coast line from Santa Barbara to Oxnard, in the interior valleys (Ojai, Piru and Simi) and over the water as far as Platform Grace.

The first sounding on September 28 was made between Lake Casitas and Ojai at 1336 PDT (Figure 4.5.3). The vertical temperature and pollutant structures showed evidence of mixing to 600 m-msl although the well-mixed layer was shallow and only extended to 350 m-msl. Ozone concentrations were about 11 pphm throughout the layer to 700 m-msl, decreasing to 5 pphm aloft. Winds in the layer to 700 m-msl were from the west-southwest but shifted abruptly to southeast above 700 m.

A horizontal traverse was then flown from northeast of Ojai to the coastline (Figure 4.5.4). It can be seen that bscat, NOx and S02 peaked in the vicinity of Ojai while ozone also showed a slight peak. This tends to suggest the influence of local sources in the Ojai Valley. The ozone levels along the traverse to the coast average 10 pphm which was also the maximum recorded at Ojai for the day.

4-84

SANBOX STUDY TRPE/l'RSS, 18ij/2 DATE, 9 /28/80 SPIRAL AT POINT 1 Tl HE 1 1338 T!I 13q5 IPOTJ

2000. 0 -l..1..!..1..!-!-,l,.U..l.l..U..U.,!-1.J..1.~.l..l..l..l.,!-I-U..~U..U.......I..I..I..I..I..I...L.,!..1..!..l..!.U..U...l.!,.U..U.t--

. . . : . . . . . : \

. . - :

~

f 1 I 1 : ; I i l i ···········-········"'· .. . . . . . : . . : .1500.0 I I := = . = : , FULL SCALE VALUE

SO. DEG. C···:···········:···········-:·······+····· ....:...........i........... i...........;........... :·········· :;., 100. PPBz: 1000. IQ-I H•I

1000.0 ........ i•··········;-.......... ;-···--·····r······ i ; ; ; i!: ... 0 = : : . . : : . =... ! : ~ : ! : l lj ; ; : ...J "'

500.0 ; ; ; ; i ~ ; i . . . .·: ...........t...........!"....... :............!........... ! ..........i.......... :..........

o.o

20 ijQ 60 80 100 PERCENT Of FULL SCALE VALUE

0

821201.0 16,20,17

AIRCRAFT SOUND ING NEAR OJAI

(1336 PDT)

September 28,1980

SRNBOX STUDY TAPE/PASS 1 1Sij/2 ORTE, 9 /28/80 SPIRAi. RT P!IINT 1 TIHE1 1338 T!I 1Sij6 IPOTJ

2000.0 _..,.................................................................................................................................................._

. . . . . . . ...... l ................ !..........,........ I ........!........... : ........T.........T ......... 1500.0 i : : i i : : :i

FULL SCALE VALUE

. . . : . : : 13 TEMP so. DEG, C ;!

........ ! ........... ~ .......... ! ... ... . .. -,:, ........... ,,.,_ ........... ~,, ........... ~.-, ............!,, .......... .

► Na 200. PPBz: ( ~- '.: + Nat 200. PPB!: 1000.0 ·:,,· .......J.......... :,, ...........i,,···········;.···········i i i XCla soo. PPB

;:0 IU

: : :

;::: ..........i.......... :........... j ........... ~ ........... ......... ~ ........... j .......... \ ........... j........... ~ ..J

"' 500.0 : i : i i

:, ........... i........... : ........... i........... ·~ .......... .

o.o 1 •

-20 0 20 ijQ 60 80 100 PEPCENT or FULL SCALE VALUE

e21201.o !6120117Fig. 4.5.3

4-85

SANBC,X TRAVERSE fROH

STUDY POINT 2 T!I PO!HT 3 (q57

TRPE/PRSS, mt3 H HSLl TIHE1 13SO TO 1358

DAm (POTJ

s /28/80

o.o

:

············:!···········1 ········:···········'··········· .

:

.j : [ .

FULL SCALE VALUE

8 TEHP so; OEG. C t,Sll;, 100. PPB

+B,crr 1000. lo--4 )1-1

821201.0 16,20:17

FULL SCALE VALUE

t3 TEltP 50. DEG. C

200. PPB► NO

+ N!lx 200. PPB

X Clo 500. PPB

S2120!.0 l~:20, 17

o.o

: .

......... -•. ... . .. .. ... . ·: ........... ; .. -..-..... ·:........... · 1 .... -.... -~ .... -..... -

12.s ···········-··········· : : != l i : l : I ~

. : . . . . :"'%,., ............. ......... ·····••·: ........... ~ .......... :·······.... ~ ........... ~··..·······:•··•··· .....:..·····..... : : : : : .'" ;::

g 25 0.,, . .........L.......... ! . I !~ ! I I I ! Q

:!; . . : . . . : : : : ..,

···........ ·= ............!.......... - ~ .......... · ·-----·--· ~ ..........-~ ........... = ...........!····..·····1--·--···....r.......... ~··--·--·--·· 37.5 ···········'··········_:·········••:••·········;···········'··········_:···········:···········(······•·:••········_:·········••:••·········

; : : . : . : . . . . ........... ~ •••··•· ....!........... ~ ............ :······ .... ~ ·--··--··--1--...-..... i--···------:--·--······: ........... ~ ........... :--··········

50.0 • I . I .. I

-20 0 20 liO EO BC 100 ~PEP.CENT DF FULL SCALE Y~LllE

Fig. 4.5.4

4-86

a

:!; N

so.o

~ j :

. . . . . : . . . . : ....................... 1........ •••.·•••••••••··• .. ••· .. •·••:--------••·l•--·----•--:••••·•••••·.·•·• .................... j, .......... ; ...........

: , , , 1 I > , i a i , ··········+··········!.···········;···········:···········;···········:··········•:••········t···--···:···········'·.......... :...........

,. ·•····· -----;- ------ - -i

...I i . ~ ! . i ~ i ! !

. ~ j' ,.

12.5 1 0 ··········;···········l·········i· ······· ··········.!···········!·········i··········:···········1···········i··········· 1··········· ~ "' i!'l ············:.············1.·· ········:··· ·······i···········t ··········.:··· ····~·-r·········-i--········· :... ········l·······················"' .., ~ 1 ... ·........... · ...........·.. . . .~ 25.0 -.

-20 0 ~O llO 60 80 100 PERCEMT CF FIJLL SCRLE VRLUE

AIRCRAFT TRAVERSE - OJAI TO COAST

(1350 POT) September 28,1980

SANBOX STUD'r TRPEJPRSS, 15qn ORTE, s 12a1ao TRAVERSE FROH POINT 2 TO POlHT S (q57 H HSLl TIHE, 1350 TC !358 (POTJ

The next spiral was carried out in the vicinity of Platform Grace at 1410 PDT (Figure 4.5.5). The temperature structur_e shows a very shallow mixed layer (about 100 m deep) with an extensive inversion to a level of 100 m-msl. The shallow surface layer was characterized by moderate turbulence while the values within the inversion layer were extremely small. There is evidence, however, in the pollutant parameters of a deeper layer of pollutants extending to 500 m-msl with a sharp top at that level. The lack of turbulence at the levels above 100 m requires that the material be advected into the area from upwind sources or that horizontal roll vortices be present in the offshore area. Upper winds observed at Ventura at the time indicated westerly winds to a level of 662 m-msl, with easterly winds aloft. Ozone levels peaked at 17 pphm near 400 m-msl but were reduced to about 6 pphm in the surface la~er. Peak ozone recorded on Platform Grace on September 28 was 8 pphm.

A horizontal traverse was then flown at an altitude of 457 mmsl from Platform Grace to Ventura to Piru beginning at 1436 PDT (Figure 4.5.6). The approximate position of the coast line is shown in the figure. The NOx concentrations were low over the water but exhibited two peaks inland, probably associated with Santa Paula and Fillmore/Piru. bscat values were similar but with relatively higher values over the water. Ozone concentrations, however, ranged from 12-17 pphm over the water to 10-15 pphm inland. The portion of the route from Santa Paula to near Piru showed ozone values of 12-15 pphm. The peak surface value observed at Piru was 12 pphm on September 28. The highest value observed at any location in the Santa Barbara/Ventura area was 12 pphm at Piru and Moorpark although concentrations of 17 pphm were observed aloft in the offshore area.

A sounding was made at 1458 PDTat Piru (Figure 4.5.7). ,The· temperature structure indicated a wel 1-mi xed 1 ayer to 350 m-msl , topped by a stable layer to 1000 m-msl. The pollutant structure also showed the presence of two layers. Although no upper wind observations were made at Piru, the winds at Simi were west to southwest in the layer from the surface to 600 mmsl with easterly winds above that level. Ozone concentrations were about 13 pphm near the bottom of the sounding but exhibited a peak of 17 pphm at 750-850 m-msl. According to the available winds the ozone in the upper layer probably came from the San Fernando Valley.

The next sounding occurred at Santa Paula Airport at 1517 PDT (Figure 4.5.8). The temperature structure showed a mixed layer from the surface to 250 m-msl, capped with an isothermal layer to 1000 m-msl. Extensive layering was observed in the pollutant soundings at 550, 900 and 1300 m-msl. These 1 ayers were appcfrent in al 1 pollutant parameters except NO. Peak ozone was 14, 14 and 11 pphm in the three layers. Available upper wind observations suggest that these three layers occurred in the air moving from the east and southeast.

4-87

SANBCIX STUDl TAPE/PASS, !8ij/5 ORTE, 9 /28/80 SPIRAL RT P!IINT 6 TIHE, 1~10 T!I 1~22 tPOTJ

2000.0-......................................................................._................................................................_ ........................... -

. . : . : : : :

· ......... ~ ··---------~----------~ .........··!······· ... ~ ...........1-----------~ ...........!-------·--- i ···---·····j··········· [...........

1500.0 ···········-············ ········: ···········:--·········: ·•·········; ··- (p .... · ....•.••... '··········· · ........... ·••..•.•.... · .....•.....

......, :r.

:5 1000.0

·········•·j••····--·--1

j j : . . : . : . . .• , ...... f••••••..•.. ;•••hou••• I•••••••..••i•----••• •• ~ •••••••••••~•n•h•Hu : ........... ~ ..... ,, .. ,. •: ,. •••••--• . . . . .

: : :

: . i : ! : : ' : : :

....... ; .......... j........... ; ......... ....j..... . .•. : ....................... : ·······----1·•··········= .......... . : ~ ; j : : : : :

. . .. .

500.D

. . . .... ~ ....... ---~ ............~ ........... ~ ........... ~ ..........·j·········...~ ...........

. . . .

o.o I. I •• ,I.

-20 20 ~o so 80 100 PEACEN, ~~ FULL SCALE VALUE

AIRCRAFT SOUNDiilG AT PLATFORM GRACE

(1410 PDT)

September 28,1980

SANBOX STUDl TAPE/PASS, IBQ/5 ORTE, 9 /28/eo SPIRAL AT P!IINT 6 TIHE, IQI0 T!I 1~22 IPOTJ

2000.0 _ ................................................................................................................................................................................_

: : : . . . . : : : : . . . ........... ~ .......... ~ ............:..·..·······i···--······: ···-------i----------- :-..........~---------·· ~ ...........~----····---: ...........

) : \ 1500.0 ···········-············ ..... ·;···········:-·-········ ;···········;····G .... ,···········;-·-········ ;·········••:••·······•• :••········· - . . . .: . :

: : : ......... j........... .;. ........... j•.••••..•• : ........... i ........... ; ........... j............: .......... .

: :......, %

1oto.o= ~ ~ •.• ; ........... j........... j .••••••••• j............;.......... .. ,-..... a,

500.0 ···········---··········

··········••:••···--···· ········[···········i···········\··.........:........... !······· .... , :

0.0 I,

-20 0 20 QO 6~ 30 100 PERCENT ~F FULL SCRLf VALUE

Fig. 4.5.5

4-88

FULL

8 TEHP

jl, Sliz

+Ela'!

821201.0 16:20, 17

SCRLE VALUE

50. DEG. C

100. PPB

1000. lo-

75.0

SANBCIX STUDY TAPE/PASS, 18tl/7 DATE, 9 /28/8D TRAVERSE FRl!M PCINT 6 TI! Pll?NT 7 tQ57 M MSLl TIME: ltl36 Tl! 1"56 tPDTJ

D.O

~.o

E er

z "' .., "' .,, "'C> : ~o.o e,

~ "'

: : ........... [ .......... j··-----·--· ...... j· ........... i.. .........~ '.........;.. -........ ~ ...........

···········-·········.... ·-······ : : ; i ; ;

100, 0 -1i.,..,..........,..,...,...., ......... ;-,....,..,.. ""1.,..,-,-,-;-,.,....,..,....,..,.,..,....,....,..,....,..,..,..,..,....,....,.....,..,..,..,,.....,..,....,-

FULL SCALE YALUE

G TEMP 50. DEG. C

II> SO;, 100. PPB

+8-t 1000. to-' M_,

0 '!~ QO 60 80 100 rERCENT or FULL SCALE VALUE

F.21201.0 u::.2::i,11

AIRCRAFT TRAVERSE - GRACE TO PIRU

(1436 PDT) September 28,1980

SANBCX STUDY TAPE/PASS, 18U7 DATE, 9 /28/80 TRAVERSE FRCN Pll!NT 6 Tl! P!!!NT 7 (Q57 N NSLl TINE, 1tl36 Tl! ttl56 !POTJ

o.o

.......... 1,.......... . . ...... ~ ........... t · .......... ~ ........... ~ ........... ~ ...........

25.0 8 "'.. "'z.., "' .,, "'Q ~ 50.0 != ~ a,

·····:····· ···········:····..···· ..: .........1············1····..... ..

: : : : i : : . . . . . : .·: ...........: . . . . ... . . . . ........--i ........... ~ ........... ~ -- ..-...... -~-- ..........

FULL SCALE YRLUE

G TEMP so. OEG. II> NO 200. PPB

+ NIJx 200. PPB X Ila 500. PPB

C

75.0 ~.......... '···········:·······.... :...........:---........ :...........:........... :...........;,.......... :..........f ......... :........... ~ . : \ . [ . : : :

........... :.. ••·••••• .. l••••·••••••:•••••••••·• ............ :- .......... !.. •• .... •• ..:•.. ·••··•·I .. •·•· .. •·••: ....................... : .......... .I = 1 = : = · : 100.0

-20 0 2~ PERCENT

qo OF Fl)LL sc~~E

sn YALUE

80 100

821201.0 1~:20:: 7Fig. 4.5.6

4-89

SANBCJX STUD'T' TAPE/PASS, !Sij/8 ORTE, 9 /28/80 SPIRAL RT Pll!NT 7 TIME: lijS8 TO 1510 (POT!

::;...;c

1500.0

. . . =············!···········~···········!············:············ . . . . . .

····1···········l········· :·········r·······•·:···········;........ :.··········

. : : . . . : . . .

•·•••\• ......... -: .......................;........... . : : : :

FULL SCALE VALUE

0 TEHP 50. DEG. C

. o,. Sil, 100. PPS

+a,,,,,, 1000. 10-0 M·l

o.o ,· -20 0

I.

2, ~o so PERCENT ~F FULL !'CALE VALUE

80 100

821201.0 13:28, 17

AIRCRAFT SOUNDING AT PIRU

(1458 PDT)

September 28,1980

SANBOX STUDl SPIRAL RT Pft!NT 7

TAPE/PASS, 18ij/8 TIME, lij58 TO 1510

ORTE, !POT!

9 /2B/80

2000.0 _ .................................................................................................................................................................__, ........... _

......... ,: ...........:............_ ...........:........... ,: .. ---------

::; "';c

1500.0 ···········-········ : : ; : i ' : : : : . :

,:, • • • • • • • • n • ; • • • • • • • nu ~ •• • n • •• • • • ~ • .. • n .. • • • : '• • .. • • .. •

FULL SCALE VALUE

0 TEMP 50. DEG.

0,. NO 200. PPB

+ NO,: cOO. PPB

C

. . ........~-----····-- ~- --------·-~----······· ~ ...........~--------··· _: ,........ .

X ll, 500. PPB

. . .

sno.o ..........~ .... ····l········-

. ; . lJ ·:····· ···--i··--·····-- ~----------- ;........... ~ .......... 0.0

1 ·

-20 20 ijO 60 PEP.CENT OF FlJLL SCRLE VALUE

80 100

Fig. 4.5.7 821201.0 ~6: 20, 11

4-9()

SANBOX STUDY TAPE/PASS 1 1H/9 DATE 1 9 /28/80 SPIRAL AT POINT 8 TIHE, 1517 re 1527 !PDT!

2000. 0-1,.r..u..i..+-.u..w..u.....................................................................................................~....- ...........'-I-

1500.0

:::;., z:

1000.0i5 .., ;:C,

,_ ..I a:

soo.o

o.o

1500.0

:::;., X

1000.0i5 .., ;:C,

;: ..I a:

scc.o

o.o

. :

i i\1' ........... !............l. . . ....... ~.:

; ; :

~ ; . .' . ' ....... ; ·······:············:

........... !............ !. .... . .....!.... ~ ; ; : :

. . . . : : . ·•••••••••> ·•··•·••••I•• •••••••• !.. ··••--•·•:•·•••····••I···· ••••1 .. ••••••••r•••••••••-r

··••••·•·••❖ ••·•••••••·•~••~••·•••i-< ......,............,.....}...,............,........... 1] I ~ I ~ : r- \ ! I~ C?·

,"";""i""i '"i'·"i'· tj11,,;. i -20 0 ,~ ijQ 60

PERCENT cf FULL ~CALE VALUE

Fig. 4.5.8

4-91

........ . ;........ :,.···········

; : :

. : ••··•••·!•••--•••; ••••••••

FULL SCALE VALUE ·

0 TEHP 50. DEG. C

!lo- sa, 100. PPB

+Boar, 1000. Jct" H-1

82120!.0 :s,20111

FULL SCALE VALUE

0 TEHP so. DEG. C

► Nl! 200. PPB

+ Nllx 200. PP8 Xlla soo. PPB

821201.0. 16,~0. 17

···········;·········••i••······••;••·········;·········••;···········;··········i·····..··••i••·········;···········;•········.. :·····"·"'"

t j.•.]tt=t!(·•I•il·•·····••:••l·•········•[: ...[: j

·••••••••• ❖ •••••••••••!•••••••••·• ❖ •••,>·••···!. •••••:••••••·•••••I•••••• ••••:••·•••••••••l••··•·••••••:••·•••••••••l••·•••••••••:•••••••·••·•r ; 0 ; : b i· ·······! ·········i··········! ...........i..••······!••·········❖ ••••••••••• , ••••••••••••:•••••••••••• ! ! ! . . . ·i

80 100

The next spiral was made at Santa Susana Airport at 1556 PDT (Figure 4.5.9). There was a temperature inversion at 550 m-msl with an isothermal structure at higher levels. Ozone values in the low layers were about 12 pphm, somewhat higher than the peak, observed, surface concentration of 7 pphm at Simi. Aloft, however, an extensive ozone layer with peak value of 23 pphm was observed, centered between 850 and 1100 m-msl. The layer was also characterized by high values of NOx and bscat· The upper winds measured at Simi indicate that.the layer above 800 m-msl was a part of the flow from the San Fernando Valley.

The final spiral was made at 1610 PDT (Fig. 4.5.10) at the western edge of the San Fernando Valley about 20 km east of Thousand Oaks. There was a mixed layer to 1000 m-msl topped with a slight temperature inversion. Ozone, NOx and bscat all peaked at the base of the inversion. Highest ozone value observed was 22 pphm from 950 to 1100 m-msl. This was clearly the same layer observed at Santa Susana (Figure 4.5.9) and earlier with somewhat lower concentrations at Piru.

A subsequent traverse from the San Fernando Valley to Oxnard at 762 m-msl indicated that the western edge of the ozone layer was not as far west as Thousand Oaks by 1630 PDT.

4-92

SANBOX STUDY TAPE/PASS, 18~/12 ORTE, 9 /28/80 SPlRP.L AT POINT 10 TIHE1 !556 TO 1605 IPDTl

20C0.0--l~...._'-!-.W..._..._._........_ ..... ...,.._..._....,.-!-........._....._.._...,.-......______....____.._....,.-;-

: : : ............:...........:........... : ·········:··········~ ..........!·····..··· : ..........:......... (········1············~···········

15~0.0 ···········-··········· ; i i ; ···;·······..··;··········•;···········;·········•·:••········· : : :

......:············i···········1 ..........;......... : ..........;......... :·······.... i- ........ :...........

: : : . . : : :

FULL SCALE VALUE

G TEHP SD. DEG. C ::;

► SIi;, 100. PPB"' :,c

+8""" 1000, Ill"" H•11000.0,!;

"'0;: ;: ..J a;

500.0

o.o

-20 0 20 10 60 BO IOC PERCENT OF FULL SCALE ~ALUE

~21201.0 IS: ZO:l 7

AIRCRAFT SOUNDING AT SAfffA SUSANA

(1556 PDT)

September 28,1980

SANBC!X STUDY TAPE/PASS, 1eq112 DRTE1 9 /28/80 SPIRAL A• P!IINT IC TI HE 1 1556 TO 1605 !POT)

2000.0-;-..............................................................-!-......... .W. ............................................................................ '-I-

. . : . . . . : . : . ........... :····.. ······!........... : .........,........... , ........., .......... :.......... r ...·····: ..........! ........... : .......... . 1500.C ..........,_,,,........ : : : i i i ; i

: : : : . . . . . . . ...... --i ...... '"""'/ ......... ~ .......... /' ...........! ........... : ...........f..........! ...........

.. :...........:••·········~···········1···········1···········

FULL SCALE VALUE

G TEHP 50. OEG, C::;., z: ► NO 200, PPB

I0C0.0 + llllx 200. PPB!a ... 0 X 0. 500 • PPB ::; ::,

... ..J a:

500.0

o.o

-20 0 20 ~O SC 80 100 ~E~CENT ~f FULL SC~LE VRWE

821201.0 16: 20, 17Fig. 4.5.9

4-93

SANBOX STUDl TRPE/PRSS, 18~/13 ORTE: 9 /28/80 SP!R0L RT ~INT 11 T!HE, 1610 TO 1617 tl'!lTl

,!000.0-,...1...1..1..1...l..l...l..l'--'-'......"+-..................................................................................................................................,.-

. . . ........... : ........... :···········i········•--:-••········~----- . . : ·········=············=···•·······1···········:-----·-·····

1500.0

FUU SCRLE VRLUE . .

;) ~ ~ (3 TEHP SO. DEG. C. . ...-- ! .. --...--..i.......---- ........... ......... ·! ...........~------····· ! ···········1············! .......... .

100. PPB,c

1000.0 :........... ~ .........-;...........;........... ;-- .........:........... ~ ........... 1000. to-" H-1 :!: uJ 0 . .:: ....... ~ ........... j........... ·............!............:...........!--·--·-----~ .......... . ...... a:

!;0:l.O

o.o

-20 0 2'J liO 60 80 100 PERC~KT r1F FULL SC~LE VRLUE

62!201.0 16:20, 17

AIRCRAFT SOUNDING - W SAt'l FERNANDO VALLEY

(1610 PDT) September 28,1980

SANBOX STUOl TRFEIPRSS, !6ij/13 OATE1 9 /28/80 3Plllq!. A1 P!IINT 11 TIHE, 1610 TO 1617 tPOTl

2000.0 --i................ '--'-' ............................................... ....,. ..................................................................... ....,. ....................... ~-

1500.0

FULL SCRLE VRLU~ . .

(3 TEHP so. DEG. C

P,. NC 200. PPB

··---- ····t········· ·····1······--·-··\··········••i--- = . ··········~........... ~ --------- -r··· ·---- -- i--------· .. ~ . . .

+ NO,: 200. PPB~ 1000.0-• .......T" .. ·····~······--f-··········L···· ····t·········--:···· : : : : : XO,, 500. PPB

=·• i ..r:J~.......[...i ... :J-••···••i :\••••••••ii•••••••••••if: - ..... ---:------------. ------------: ..........:........... j •....•...•• '. ........... ~ ...........!............~ ----------!------------~ ..........

: : : :

o.o 1 ·

-co 0 2~ ijQ PEnCENT ~, fULl

so SCRL: YALU:

80

Fig. 4.. 5.10

4-94

82120!.~ lS:20: 17

4.5.6 Tracer Results - Test 4

Release Location: 4 mi West of Ventura Date: September 28, 1980 Time: 1240-1900 PDT Release Rate: 6.18 g SF6 per sec

The release on September 28 was a joint release with the BLM program. The release was made from the R/V Acania.

Surface winds during the release are given in Table 4.5.5 for the Acania and for Surfer's Point at Ventura whi~h was the closest available observation on land.

Table 4.5.5

Surface Winds September 28, 1980

Acania Surfer's Point Ti me w/d w/s w/d w/s

13 PDT 231° 2.0 m/s 220° 2.9 m/s 14 247 2.9 225 3.3 15 257 3.0 225 3.3 16 253 3.4 235 3.2 17 235 3.3 18 260 3.5 210 1. 7 19 257 2.3 210 0.7

Surface winds during the release were southwesterly at both locations with similar velocities until late in the period when the seabreeze flow along the coast decreased substantially. The winds in the table indicate that the release was made into the seabreeze flow which extended offshore as far as the position of the Acania (4 mi west of Ventura).

Streamline charts for September 28 are shown in Figures 4.5.11 and 4.5.12. An onshore flow had developed along the Ventura County coast line by 12 PST, continuing through 16 PST. By 20 PST offshore flow had commenced in the northern part of .the County with onshore flow continuing south of Ventura. Weak, offshore flow also prevailed at 24 PST.

Tracer trajectories for September 28 are shown in Figure 4.5.13 together with times of observed maximum concentrations at various locations. The principal tracer route was toward Piru with a secondary branch following the Ojai Valley. A portion of the material following the Piru route apparently did not escape in the upslope flow and returned to the coastal plains during the night.

4-95

w/s in knots

12 PST

w/s in knots

16 PST

Fig. 4.5.11 STREAMLINE CHARTS - September 28,1980 4-96

~~~ w/s in knots

20 PST

~SAHT~MA

~ :-~~" 0 . ~-- :\,- -DENBERG AFB vz,. -

GAVIOTA PASS PT CONCEPTION •

HONDO

~0~

• GRACE

--ANACAPAIS Release 1240-1900 PDT

20 Time of Observed Concentration

ESTU1ATED TRACER TRAJECTORIES - September 28,1980

Fig. 4.5.13

4-98

- -

Figure 4.5.14 give the hourly ozone and SF6 histories at Ojai and Piru on September 28. Peak ozone concentrations occurred at Pi·ru at 14-16 PST and 13 PST at Ojai. A strong SF6 peak was observed at Piru at 19 PST but no major tracer concentrations were found at Ojai. As indicated by the tracer concentrations at Ventura the peak of the tracer material passed the coast line between 14-21 POT. Based on the peak ozone period observed at Piru, the air parcels containing this ozone probably left the coastal area prior to the arrival of the SF6 from offshore. In view of the long release period and the short downwind distances involved, it is not possible to get a reliable estimate of travel velocity from the release point to inland locations.

Xu/Q values for September 28 have beeA-computed for observed --:

maximum tracer concentrations at various locations. These values are given in Table 4.5.6.

Table 4.5.6

Calculated Xu/Q Values Test 4 - September 28, 1980

Wind Type of Speed Location Time Sample Distance Xu/Q (x 10-6)

2.6 m/s Camari 11 o 23 PDT H 42 km . 36 m-2 Pi ru 20 H 53 .73 Santa Paula 20 H 30 3.01 Thousand Oaks 20 H 43 .OS Ventura 14 A 6 22.2 Ventura 15 A 6 24.1 Ventura 16 A 6 33.0 Ventura 16 A 6 24.4 Ventura 17 A 12 8.4 W Santa Paula 18 A 25 2.• 5 Santa Paula 17 A/C 25 3.2 Ventura 14 A 6 5. 25 Ventura 15 A 6 5.02 Ventura 15 A 6 12.68 Ventura 17 A 6 12.42 Ventura 18 A 6 7.83 Ventura 19 A 6 6.99

H - Hourly samp 1e A - Automobile sample

A/C - Aircraft sample

4-99

20

30

pphm

03

20

10

-- ..,. -.... I

I

-

I

_. -- - - .,... --

SF6

ppt

100..

.... ...... ____ - ----15 17 19 21 23 01 PST

I

I

I I

I

I I

/

,,/\ / \

/ \

\ \

\

\

\

Piru

- -.... -- ..... -

20 200

Ojai

10 100

.... - - ---- ,-..._ - -- - -15 17 19 21 23 01 PST

HOURLY CONCENTRATIONS OF OZONE AND SF 6 - September 28, 1980

Fig. 4.5.14

4-100

These values have been plotted in Figure 4.5.15 for comparison with Pasquill stability categories. Highest Xu/Q values, representing maximum impact, correspond to stability categories E-F for both hourly and automobile samples. Other values shown on the graph may represent a lack of direct tracer impact at the location.

Total tracer dosage was calculated for the 24-hour period of maximum impact at each of the hourly sampling locations. These values are shown in Table 4.5.7.

Table 4.5.7

Total SF5 Dosages Test 4 - September 28, 1980

Location Total Dosage Number of Hours ~ 10 ppt

Santa Barbara 406 ppt 8 Carpinteria 245 10 Ojai 233 13 Ventura 607 18 Santa Paula 5549 24 Pi ru 944 13 Oxnard 1450 17 Camarillo 682 20 Thousand Oaks 151 9

Although the greatest short-term impact was observed near Ventura the location did not correspond to one of the hourly sampling locations. As a result Santa Paula showed the highest total dosage impact followed by Oxnard, Piru and Camarillo. Total number of hours with concentrations of 10 ppt or more were all quite large, ranging up to 24 hours at Santa Paula. This illustrates the importance of carry-over, particularly in the coastal and inland valleys of Ventura County.

A BLM release was carried out on September 27, the day before Test 4. A general background of 15-20 ppt was found in the area on the

( morning of September 28. In isolated pockets, higher values were found. Further details appear in a later section.

There were no automobile traverses carried out on September 29 since a BLM release was scheduled on that day.

4-101

---------

* not adjusted for difference in sampling time

103

I I

• Mobile Samples*

i Hourly Samples

105 10-

%,-... 10-2 GI-a., I E-

z Q t= 4

4.6 Test 5 1 October 1980 - Release from near Platform Grace (0600-1100 PDT)

4.6.1 General Meteorology

A large surface high pressure area was centered in southern British Columbia with offshore winds from southern California to Washington (Figure 4.6.1). The therma_l trough in California was located along the coast, resulting in warm temperatures inland. Skies were clear at Santa Barbara all day until near midnight when low clouds and fog developed. Pt. Mugu reported fog for several hours in the early morning and severely restricted visibility during the balance of the day.

Table 4.6.1 gives the significant meteorological parameters for October 1.

Tab1 e 4. 6 .1

Meteorological Parameters

October 1, 1980

850 mb Temperature (Vandenberg AFB) 25°c Pressure Gradients (07 PST)

LAX-Bake rs field -2.8 mb Santa Barbara-Daggett -2.8 mb

Inversion Base (15 PST) Pt. Mugu 79 m

Maximum Surface Temperatures Thousand Oaks 100°F Pi ru 108 Santa Barbara 80

Temperatures aloft at 850 mb warmed considerably from the conditions of the previous test on September 28. A temperature of 25°C is well above average for the time of year. Although the temperature aloft was slightly higher (27°C) on October 3, surface maximum temperatures inland were higher on October 1. A maximum of 108°F at Piru represents an exceptionally high value for early October. Pressure gradients were directed offshore for all values shown in the table.

4-103

. . . \ '

I - :.""' . ~j~-- :_;~

' :,.;..:.:. \..._1-.\ - ~·

,:, ' ' .,,. ,.,. .... \..: .

Fig. 4.6.1 WEATHER MAP October 1 , 1980

4-104

4.6.2 Transport Wi rids

Surface transport winds for October 1 are given in Table 4.6.2. At Pt. Conception easterly winds prevailed early in the morning and late in the evening. Velocities of 11-12 m/s from the east were recorded before midnight. At Hondo and Santa Barbara, east to southeast winds occurred in the morning and evening. The characteristic southwest winds associated with a temporary breakdown of the eddy were observed in the afternoon at both locations. Winds at Platform Grace were southeasterly through 14 PST and the normal afternoon seabreeze from the southwest was present only briefly. Wind velocities at Platform Grace were quite light. The seabreeze flow was also absent at Ventura with light south to southeast winds dominating the flow during the day.

Table 4. 6. 2

Transport Winds - Test 5

October 1, 1980

Time Pt. Ventura PST Conception Hondo Santa Barbara Grace Surfers Point

w/d w/s w/d w/s w/d w/s w/d w/s w/d w/s 06 105° 2.0m/s 093° 4.9m/s Calm 115° 0.4m/s 125° 0.4m/s 08 112 1.8 102 1.3 120° 2.1 151 1.3 255 1.8 10 315 3.9 098 0.9 150 3.6 117 0.3 190 1.2 12 309 7.5 126 0.4 190 4.1 163 1.8 150 2.6 14 294 4.7 248 2.2 180 3.6 144 2.8 145 2.2 16 069 3.2 258 2.2 240 4.1 271 3.1 180 1.8 18 262 1.5 254 1.3 Calm 360 2.5 330 1.0 20 311 4.6 219 0.9 250 2.6 017 0.4 135 3.0 22 094 11.4 Calm 090 4.6 024 0.9 125 2.6 24 100 12.4 109 6.3 080 3.6 354 1.5 135 1. 5

4.6.3 Mixing Heights

Mixing heights observed on October 1 by various methods are shown in Table 4.6.3. Intense heating resulted in deep, convective mixed layers at all inland stations. The cool, marine layer appeared in midafternoon at these stations as indicated by the aircraft soundings. Until late afternoon there was little evidence in any of the soundings of an upper pollutant layer. ln the late afternoon indications of such a layer appeared in the Santa Susana and San Fernando Valley soundings. This layer occurred with northeasterly winds in contrast to the east to southeast winds on September 28 which brought much higher ozone values in aloft. At Platform Grace there was an elevated pollutant layer with a top of 250 m-msl within a strong temperature inversion. The maximum ozone concentration of 14 pphm occurred at 200 m-msl and was not reflected in the surface concentration of 8 pphm. It appears that the surface mixed layer did not extend to 250 m but only to 100 m which represents the apparent base of the upper pollutant1ayer.

4-105

Table 4.6.3

Mixing Heights*

October 1, 1980

1. Measured by Sampling Aircraft

Time Location Height

1341 PDT Ventura 300m 1403 Ojai 2500+ 1449 Pl at form Grace 100

(Upper 1ayer at 200m) 1539 Pi ru 400 1600 Santa Paula Airport 200 1707 Ventura 100

(Upper layer to 400m) 1746 Santa Susana Airport 400

(Upper layer to 700m) 1805 w end of San Fernando Valley 300

(Upper layer to 1000m) 1857 Santa Barbara 400

2. Measured by Pibals

Time Santa Ynez Ojai Simi Ventura

11 13 15 17 18 19

PDT 159m 758

1165 159

159

263m 758 852

1395

0

53m 53

758

263

53m 53 53

159

3. Measured by MRI Acoustic Sounder

Santa Paul a Airport Height

11 PDT 130 m 13 100 15 90 17 150 19 21 140

* Heights are above surface

4-106

4.6.4 .Regional Ozone Concentrations

Maximum ozone concentrations at several stations in the area are shown in Table 4.6.4. Temperatures aloft increased compared to the value observed on September 28. As a consequence, maximum surface ozone concentrations also increased. Peak hourly values at Goleta, Piru, Simi Valley, South Mt., Thousand Oaks, Moorpark and El Rio all exceeded the state standard. Background ozone concentrations, as measured during the aircraft spirals, showed average values of 7-8 pphm, a· relatively high value and comparable only to September 22 among the test days.

Time histories of the hourly ozone concentrations are plotted in Figure 4.6.2. Piru and S4mi peaked at about-13-14 PST. Ojai shows a flat peak extending from 11-16 PST of only 9 pphm. Peak temperatures in the inland areas occurred rather early in the day (around 11 PST). Intense surface heating (111°F at upper Ojai) resulted in deep, convective mixing and the elimination of any stable layers. As noted in the previous section the measured mixing height at Ojai at 1403 PDT was over 2500 m with no evidence of a marine layer intrusion. The time history of the ozone concentrations at Ojai indicates that this condition continued through 16 PST and resulted in uniform, but comparatively low, surface ozone concentrations.

In contrast, Piru showed a sharp increase in surface ozone between 13 and 14 PST accompanying the arrival of the marine air. This cooler air served to keep the pollutants from mixing upward and resulted in the 15 pphm peak concentration at 14 PST. An aircraft sounding (see Section 4.6.5) at i539 PDT clearly shows the presence of the marine layer and the increased ozone within that layer.

A similar layer was found in a sounding at Santa Susana Airport at 1746 PDT (see Table 4.6.3). Since the maximum temperature at Simi occurred at 10-11 PST while the peak ozone was observed at 14 PST, it is apparent that the principal ozone contribution came from the marine layer intrusion as was the case at Piru.

The plots of hourly ozone at Ventura and Pt. Hueneme show pronounced peaks at 22 and 21 PST, respectively. South to southeast winds prevailed along the coast at this time. The peak at Platform Grace occurred during mid-afternoon, also with a southerly wind. The source of the late evening ozone is not clear but transport over-water from the South Coast Air Basin is a significant possibility.

4-107

10

10

10

pphm Piru

04 08 12 16 20 PST

04 08 12 16 20 PST

Ventura

04 08 12 16 20 PST

Fig. 4.6.2a HOURLY OZONE CONCENTRATIONS - October 1,1980

4-108

10

10

10

10

pphm

Port Hueneme

04 08 12 16 20 PST

El Rio

04 08 12 16 20 PST Moorpark

04 08 12 16 20 PST

PST04 08 12 16 20

04 08 12 16 20 PST

Fig. 4.6.2b HOURLY OZONE CONCENTRATIONS - October l ,1980 4-1')9

10

Table 4.6.4

Regional Maximum Ozone Concentrations (pphm)

October 1, 1980

Time of Max \✓ ind Direction Time of Max Temp Location Max 03 (PST) at Time of Max (PST)

Pt. Conception 8 13 311 ° 17 Goleta 11 15 200 13 Platform Hondo 8 12-14 -- 126-248 Ojai• 9 11-16 165,300 11-12 Piru 15 14 255 11 Simi Valley 11 14 280 10-11 South Mt. 12 12-13 190 11 Thousand Oaks 15 12-14 320 08 Moorpark 15 14 M M El Rio 11 13,15 M M Ventura 7 22 125 11 Pt. Hueneme 7 21 180* 11* Pl at form Grace 8 14-15 170 16

Background 7-8 *Pt. Mugu

4,6.5 Aircraft Sampling

The aircraft sampling on October 1 was concentrated primarily in the vicinity of Ventura and inland valleys including Ojai, Piru and Simi. Soundings were also made near Santa Barbara and in the offshore area near Platform Grace.

The first sounding was made near the Ventura Marina at 1341 PDT (Figure 4.6.3). A strong, low-level temperature inversion was present marked by elevated levels of 03, NOx, S02 and bscat. Depth of the layer was about 300 m which represented the depth of the marine layer at that location. West to southwest winds were present in this layer. Peak ozone value in the layer was 17 pphm with a sharp reduction to 11 pphm near the surface.

A horizontal traverse from Ventura to Ojai at 213 m-msl beginning at 1357 PDT demonstrated the marked changes which occur from the coast inland (Figure 4.6.4). Note first the large change in temperature at a constant elevation of 213 m-msl. A temperature change of 15-20°C occurred from the beginning of the traverse to the end. This resulted in an increase of the mixed layer from the coast inland and a consequent decrease in pollutant concentrations. Peak bscat and S02 concentrations occurred at 6-7 km inland while NOx and 03 peaks occurred slightly later along the traverse. The ozone level at the start of the traverse was 16 pphm but decreased rapidly a short distance from the coast.

4-110

SRNBOX STUDY TAPE/PASS, 185/2 DATE, 10/1 /80 SPIRAL AT POINT 1 TIHE1 13U TO 1355 tPOTl

ll000.0 -l,..1.,1u...u..u..u..1..i..1..1.~I..I.J..1.J..I...U."4..U..U..l.l..l..l,..l.,l,..l.,IU...i.,!-U..U..U..I..I..I..I..I..I.J..I.J..I...U..i..t-

··········:· : : : . . . : . .

······· ·i l........ :.~, ...........i.::··········· =,.: ...........! ·········-·-············ ,; : :

~ ~ ~ ••••o- ■ HO• juoo•o•ono ,,, .. ,oo:,Oo•nu•••--l•nno•u< .\_

···········:···················••i••·······J··········;···········;·········J········__:·

!--r

··········+··········:············:············1···········+···········1············:············i··········-r··········i··········-r··········

3000.0 > : i : : :i FULL SCALE VllLUE

. . . . . . (3 TEHP SO. DEG. C .. 1 I 100. PPBz: ► $Oz :: ... · I . i i +Bia, 1000, 10""' M•I!: ' 2000.O ········;···········;·········••:••·········;···········i.···········

w - -~ .. C,

_. i:! . . . . . .

....... • ..•l••hOonno: • •u- ■ HnlunHHHO; .uuuon!u,uuu,." ,,,.,,,,,,

a:

1000.D , ! I

1 I~ ! !·· o.o

0 20 qo 60 80 100 PERCENT OF FULL SCALE VALUE

821201.0 17101158

AIRCRAFT SOUNDING fJEAR VENTURA MARINA

(1341 PDT)

October 1,1-980

SRNBOX STUDY TAPE/PASS, 185/2 DATE, 10/1 /80 SPIRAL RT POINT 1 TIHE1 13U TO !SSS tPDTJ

ll000. 0 --l,..l.,IU..1..!-.U...U...l.l..L.IU..1.1..U...U...U..L.IU..I..I..U..U...U..L.1U..U..U..U...U..I..IU..U..U..U...U...U..I..~

. : . . . . : . . ; . ........... : ........... ! ........... :,........... !··· .. ·· .... ~ ...........!···-----·--·~···........! ........... : ........... ! ........... : .......... .

sooo.o ··i '.---1--T--!---i--! t-:-: ! FULL SCALE YALUE :: enz:

····-·····1-·····--r·······: ··········r······r ········~··········-r·········r·········: ········r·········: ......... (3 TEHP II> Na

so.

200.

DEG.

PPB

C

I

!: 2000.0 + Nll,c 200. PPB w C,

i:! ;:_.

X llo SOD. PPB

a:

1000.0

: ········-:--......... ! ......... o.o

-20 0 20 qo 60 80 100 PERCENT OF FULL SCALE VALUE :

Fig. 4.6.3 821201.0 17101158

4-111

···········-··········:. ······ 1 ··· ·······1···········i···········1· ········1:··········1···········1···········:···········i···········

··r······, ········1···········;··········l············1···········!···········i-·········· ·······1··········1···········!···········1···········1···········:· ······••:••·········1·········••:••·········

... ·~........! .........··:·.......... r ......·r··· ..

.

SANBCJX STUDY TAPE/PASS, 185/3 DATE, 10/1 /80 TRAVERSE FMH POINT 2 ~ POINT 3 1213 M !ISL) TIHE• 1357 Ta 1~02 IPOTI

o.o

5.o 8 ~ "' ;!'; "' ... "' C, :: 10.0 C,

!; ., i i , : j I

•••••••~•----h•"""t••••Hun•~••n•n•--•; ........... nu•••• j••••..•••..~------••--• ~ •••••--••••

FULL SCALE VALUE

(:I TEHP 50. DEG. C

!>SO, 100. PPB

+~ 1000. ID"" M-•

15.0

. . . ... \..........·i·.......··: ...........!............,............!............,. .........:·.......... ·~· ........... 20.0

: :

: :

-20 0 20 qo so 80 100 PERCENT !IF FULL SCALE VALUE

AIRCRAFT TRAVERSE - VENTURA TO OJAI

(1357 PDT)

October 1,1980

SANBCIX STUDY TAPE/PASS, 185/3 DATE, 10/1 /80 TRAVERSE FROM POINT 2 TO POINT 3 1213 H HSLI TIHE, 13S7 Tl! 1qo2 IPDTJ

o.o

5.0 0

~ ., ;!';

... "' C, "' :: 10.0 C,

~

15.0

20.D

. . ·····l····..·····l············l··········••i••·····..···:-----------

. . . . ·····r········· j ••········-r···········=-···········

i : : i : : ;

: : .... ... i •• '........~--· ·······: ..........., ········r·········r··········r···········

~ ~ i : j i .......... !........... ,: .......... .

-20 0

821201.0 17:01:58

FUl.1. SCALE VALUE

(:I TEMP SO. DEG. C

~ NO 200. PPB

+ Ni!x 200. PPB XC!a S00. PPB

20 qo 80 PEACEtlT er FULL SCALE VALUE

80 100

Fig. 4.6.4 82120!.D 17:01:58

4-112

The sounding at Ojai {Figure 4.6.5)_ at 1403 PDT confirms the presence of a deep, mixed layer with strong, surface heating (38°C). An adiabatic temperature sounding was observed to 2500 m-msl. Pollutant parameters were uniform with height, representing a well-mixed layer. Ozone levels ranged from 7-9 pphm throughout the sounding. Peak ozone level for the day at the surface was 9 pphm.

A horizontal traverse was flown from Carpinteria to Platform Grace at a height of 183 m-msl beginning at 1440 PDT {Figure 4.6.6). All measured parameters showed uniform concentrations but ozone values were relatively high {13-14 pphm) throughout the traverse. These data confirmed the offshore ozone characteristics measured earlier at Ventura and pointed out the widespread nature of tile ozone layer.

The sounding at Platform Grace (1449 PDT) is shown in Figure 4.6.7. A strong surface temperature inversion was present representing very warm air aloft undercut by the cool surface temperatures. The pollutant profiles indicate a mixed layer of about 200-250m depth. Peak ozone concentration was 14 pphm, again indicating the shallow but extensive horizontal character of the layer. Peak ozone concentration at the Grace platform was 8 ~phm at about the time of the sounding.

A horizontal traverse from Platform Grace to Ventura, shown in Figure 4.6.8, began at 1519 PDT. The elevation was 213 m-msl which was still within the offshore pollution layer. Ozone concentrations were 13-14 pphm throughout the traverse except for a brief increase to 17 pphm slightly offshore. Al 1 observed pollutant parameters showed a similar increase at this location.

The traverse continued from Ventura to Piru (Figure 4.6.9) at 305 m-msl. As in the traverse to Ojai shown earlier, a substantial increase in temperature was observed along the flight path. Ozone levels increased sharply just inland from the coast to a level of 22 pphm but then ranged 12-14 pphm for the balance of the traverse. These values were significantly greater than observed earlier on the traverse from Ventura to Ojai.

A sounding was then made at Piru {Figure 4.6.10) at 1539 PDT. There is a slightly stable layer apparent in the sounding above 550 m-msl. The effect of this stability is shown in the pollutant profiles with ozone concentrations to 14 pphm below that level and 8-10 pphm above. The upper ozone layer is comparable to that observed earlier at Ojai. The lower layer represents an undercutting of marine air from the coast with restricted vertical mixing and higher ozone layers. Between 12 and 15 POT the surface temperature at Piru decreased 6°F and the surface ozone concentration increased from 6 to 15 pphm as the marine air passed the station. As indicated, the maximum surface temperature occurred prior to the arrival of the marine air; the maximum ozone concentration occurred within the marine air.

4-113

SANBOX STUO'l' DATE, 10/l /80 Sl'!IIRL RT POINT 3 TIME, lQOS TO 1Q23 {POTJ

qooo. o~......................_........_...,_...._...._...,_......,....._....._.,...........-.-....,.......................................................................--t-

: : : . : : ···········:···········t·········: ········:···········:···•·•·····:···········1 ·········1··········= ·••·······;···········:···········

sooo.o ···········1···········:···········:···········:···········:··········"("·········1···········(·········:··········•:••·········'.··········· FULL SCALE VALUE

(3 TEMP 50. DEG. C···········:······················:···········1········: .... ··!···········:··········+··········:···········i···········1···········:::;., 100. PPB:c 1000. lo-' M-l2000.0

~ : : ~j : : : : -.j , i 1 ~ ~ . . . - . . . . . . ............:................... T---------·r·····...... ~ ...........~----------- ~ ----- ----~---·······'~ ··········j·····---·--·~ ........... ~ a: : :

1000.0 : : :i i ~ i ~ ~ :

o.o

-20 0 ;io PERCENT

qo so OF FULL S'CllLE VALUE

80 !00

8cl20l.O 17101,58

AIRCRAFT sourm HIG AT OJA I

(1403 PDT)

October l , 1980

SANBOX STUD'l' SPIRAL RT P"IMT 3

TRPE/PRSS, 185/1' TIHE1 11'0S TO IQ23

DATE, lPDTJ

10/1 /80

!1000.0 ~................. _...._...._.... ................................... "'-!-.............................................. _......................'+...........................,._

. : ; .

···········1···········i---·····\···········1··········1 ·······-i--·········:···········!···········=···········1···········:···········

sooo.o : i ; : : : : : : : : . . . FULL SCRLf VRl.llE: . :

. : : : . . . : : . . (3 TEI!!' 50. OEG. C···-···· 1· ······ ·•····· ····-r--·· .··-r·····..: ..... ··~···········I_··········~···········: ··········-r·········· 1··········· ... ► NO 200. PPB"' :c + Nil,: 200. PPBcOOO.O ~ ···········--·-······ ; . i ; i - i : X C. 500. PPB ~ ~ I ~ i

: . : . ... ····1···········; ···········1···········i ... ·--·!·---------•ro••···--··!··--··---·· ~ ...........= ... a: : :

1000.0 = i l : :

: : ·········:·········;···········:··········+··········: .........;...........

: : o.o

-20 0 20 PERCENT

ijQ

OF FULL SCALE 60

VALUE 80 !00

Fiq. 4.6.5 82120!.0 17:01:58

4-114

SANBOX STUDY TAPE/PASS, 185/6 DATE, 10/1 /80 TRRVERSE FROM PISINT q TIS PISINT S {183 M MSLI TIME, 1qqO Tl! 1qq9 !POT!

o.o

1· l ! i .

I i .

! : ! i : 12.s ···········t···········;···········;· ! ! ! · ; ! i 1

!: ~

: : . :"'

.. 1!';,.,

"'

........ l ·······r··········.. ·······i---····~ ........+··········' ········r········· 1··········!··········· 1 .......... . ... :: 2s.o ···········-······················7 ·····r·········l··········r········· - .~ ; : :.. ~

: : . . . . . . . . . 6" ........... :,. .....................u ❖ uun•• 00 •luoouu••. •••••••••ulu•••••• ....❖ •• .. •••••nf, ......... ,;,,,,, ....... !•••• .. •..•• ❖ •••••·•••··

37.S --! : ! ; ! ' : ! : i : ··· ·· : i i I I : I I i ! }

so.o

-20 0 20 qo 60 BO PEIICENT aF FULL SCALE VALUE

AIRCRAFT TRAVERSE- CARPINTERIA TO GRACE

(1440 PDT) October 1 , 1 980

SANBOX STUDY TAPE/PASS, 185/6 DATE, 10/1 /80 TRAVERSE FR!!M Pe!NT q TII PISINT S {189 M MSLl TIME, iqqo TIS WIS {POTI

o.o

12.S

:. ~

... "' ,., ~

..

... ~ :0

....25 0 ~

:; :!!

37.S

. .

··········r········ ······r········ i ·········:·········· :··········

I 1 : '. i i '. ···········1··········r····

...........-.............. ..

..

·. '.,,, ·.·.·.·.·.·.·.·.·.·..·1,,·····.·.·.·..··.·.·.·.: ········r········· : ········r··········: ........... •••••••••••-••••0000000,,u,, •••••••••;•••••••••••i•••••••••••i•••••••••••;,.•••••••••

... -...... j-.........!······--·

: . . . : . . . . : . ........................., ........... : .........., .......... >..........., ........... : ..........., ........... : ..........., •••••••••• ,; ••••••••••

-1 --

1

-i-1 · l-i i ! I : : ·········1·········:··········:··········:···········:···········1···········i ·····················: ·········:············:·•·········

FULL SCALE VALUE

SO. DEG. C

100. PPB

1000. lo-' H•I

821201.0 17,01:58

FULL SCALE VRLUE

e TEHP 50 • DEG. C ► NO !NOP

+ NOx 200. PPB Xe,, 500. PPB

-20 2D qo PERCENT OF FULL SCALE

60 VALUE

80 100

Fig. 4.6.6 821201.0 17,0t.58

4-115

50.0

SANBCJX STUD'!' TAPE/PASS, 18517 ORTE, 10/1 /80 SPIRAL RT PllINT 5 TIHE1 1qqg TO 1505 tPOTJ

,000.0-....1,..1..1,..1,.1..l..J.,;U..U.. ................................................. ..,... ....................................................................... "'"'t_

: : , : I : , : I ! ·1··-sooo.o : i : ; . ; : : i : i

FULL SCALE VALUE : : :

....------..; ........... ! .......... --~ ........ ---!..-......-~ .......... ! ...... --... ~ ........... : ...--..-... ~ ........... ! ........... : .......... - (3 TEHP 50. OEG. C :::::., ~ j . . j ~ i : 9' SC,, 100. PPe

+Boat 1000. II?""""'

a:

~ !: 2000.0 ; ; ; ; ·····i·········••:-••····-·••:••········r·········i···········

~ I = ~ i ••••• ; ••••••••••• • ••••••••••• j••••••••••••: .......... .

O..... "'

····i··········+········· ❖ ••········1·········>· l ! I I 1000.0 ; i ii : i '.

...:...........l···--······t .......---·j···..····..t···········~----: : :

o.o

-20 0 20 qo so 80 100 PERCENT OF FU~ SCALE VALUE

821201.0 17:01:58

AIRCRAFT SOUN:JING AT PLATFORr1 GRACE

(1449 PDT) October 1 ,1980

SANBOX STUDY TRPE/PRSS, 18517 ORTE, 10/1 /BO SPIRAL RT PCINT 5 TIHE, 1qq9 TO 1505 !POT!

qooo. o-1..............,..................!-'-.................................. ....,. ........... ..,... ................. ....._..._..._ ........... ..._....._....._.,_._.....,....,_....,_

. . . : : . : ··········· ~ ...........~----------·~ ··--------!--·-------~ ........... ~ ........... ~ ........... ~ ........... ~ ...........;........... ~ ...........

. . . : :

:moo.a : : :: ! .

; ; : .

: : : FU~ SCALE VALUE: :

- : r • • • •• ; : • • : : • f;;J TEIII' 50. DEG. C···········i·········--r··········1·········1··········!·········r·········1.·········r·········:··········r······:- ........a

11> NC 200. PPea:

· .......... · ...........·. . : : : . + Na, 200. PPB2000.0!: : ~ ~ I ~ X 0. 500. PPB~ . .;: : : ..... ~ ........... ~ .......... • i •..•••••••·~ .......... . .. ..I . .

"' 1000.0 -...... ·...........·........... · ........

o.o

-20 20 qo so 80 100 PERCENT aF FULL SCALE VALUE

Fig. 4.6.7 821201.0 l7:0l,58

4-116

SANBCJX STUD'!' TAPE/PASS, 185/9 DAT£, 10/1 /80 TRAVERSE FRON POINT 5 Tl! POINT I 1213 N HSU TIHE1 1519 Tl! 152ll CPOTl

0.0

. . . .

····••-"(•·······j······· ········--!············!···········i··········i·········1············:··········r······· i ......... .

12.5 ···········---·················· ' . : . : : : :! : , , I : , " FULL SCALE VALUE~ :D . : . . : : : .::c.., 6 TEHP 50. DEG. C···········-;···········j........ ·····!···········1··········r········1···········:··········r·········r······:······..··· "' .,, e, sci, 100. PPB "'a

+Bs;,r, 1000, !a-' N-1: 25.0 ::! ...z . i ! ~1 '. : l : -·i : '. : '" ·······1 ........-r·········T··········~·········•· , . ········-r·········~···········~········••i ..........r······· ·: ...........

97.5

'. i '. : : : i i : : '.········•--•, ...........,........... : ...........,........... ,: ........................; .........,.,............~ .............. -........ :,,......... j : ) j j j \ [ 1 : :

so.a

-20 0 20 llO 60 80 100 PERCENT OF FULL SCAI.E VALUE

82120!. 0 17,01158

AIRCRAFT TRAVERSE - GRACE TO VENTURA

( 1519 PDT).

October l , 1980

SANBCJX STUD'!' TAPE/PASS, 185/9 DATE, 10/1 /80 TRAVERSE FRON POINT 5 Tl! P!!INT 1 1213 H NSLl TIHE, 1519 Tl! 152ll CPDTl

o.o

. . . . . ......... ~ ....... ----1----. ........!........--. j ' . .. ......!.......... -~ ...........!........... ~ ...........

12.s ···········-·················· "'

FULL SCALE VRLUE~ z n ........... ·-~ ...........i... ,.. . i I I i i:D ......1···..····1 ..........r...... ..........l........... ~ ...·..·····1··· ..····-- l........... 6 TEHP so. DEG. C"' .,, e, NII INl!P"' a I = l :. ! I= = 1

+ Nllx 200. PPB~ 25.0 ···········:··········r·········:···········(········:·········•·:••·········' ··········>··········:···········:---········:··········· a XO. 500, PPB~

"' ........... : ........... j........... : ,......... j........... ; ........... j ........... : ........... j ........... ; ........... j........... : ......... ..

!7.S : ~ I : ! : i ; : ~ : ···········: ·········!--···--····: ·········:··········r··········:········•--:••········:········· '.···········!···········=···········

so.a

0 20 PERCENT OF

ijQ FULL SCALE

60 VALUE

80 !CO

Fig. 4.6.8 4-117

821201.0 1'ir011S8

37.5

so.a

:

o.o

.......... -~ ..------... ~ ........-

. . .

FULL SCALE VALUE

SO. DEG. C

100. PPB

1000. lo-' H-l

SRNBCJX STUO'f TAPE/PASS, 185/10 ORTE, 10/1 /80 TARVER5E FR!IH P8INT I Tl! P!IINT 6 !SOS H H5Ll TlHE, 1525 Tl! 1539 !POTl

·········1 ·······!···········1··········,·•········~··········-i-··········:-·······-r·········j··········r·········1··········· ~ ; ~ i ; : ;

. . :···:···········i···········i·······' ·········i·······················i··········[ ··········

-20 20 qo so 80 100 PERCENT !!F FULL SCALE VALUE

AIRCRAFT TRAVERSE - VENTURA TO PIRU

(1525 PDT) October 1 ,1980

SANBCIX STU0'1' TAPE/PASS, 185/10 ORTE, !Of! /BO TRAVERSE FA1!I! Pl!INT I Tl! Pl!INT 6 !SOS H MS1.l TIHE, 1525 Tl! 1539 IPOTl

o.o

12.5

" '.::,, ~ .,, ! ... 25.o z ....

37.5

50.0

···········-··------

····-······... --"'········

: . . : .. : .......... ' ~ ,, ......... i............ : .......... .

: : :

. .. . . : ·········:···········:···········:··········i···········1··········[ .......... . . . : : :

= l : : = i : : : :

··········'.··········•t··•········:····· ·········:···········t···········

2~ qQ 60 80 100-20 0

821201.0 17,0l,SB

FULL SCALE VALUE

0 TEMP SO. DEG. C

► NI! 200. PPB

+ Nil,: 200. PPB X !lx 500. PPB

PERCENT OF FULL SCALE VALUE

!121201. 0 Fig. 4.6.9 17, □ l,SB

4-1i8

• • •

SANBCJX STUDY TAPE/PASS, 185/11 DATE• ID/I /80 SPIRAL RT P!!lNT 6 TIHE1 1539 TO ISSQ !PDTl

QOOO.O ~,-i-1..1-~.U.....,,_._....._......._.......,.,_...._......,...._....._..,_..,......_..._..._.....,...,.-'-'...._..._..._.....,.._.,.._...._.'-t-

3000.0

:;;.., z:

2000.0!: .. c:, ;;!

s a:

1000.0

o.o

···········:···········:···········:············1·········[··········-!--·········1···········!············1···········!············:···········

···········1·········••:••·········1··········r·········i···········;-··········:···········'.···········:··········•:••·······••:••·········

: : . : ............;...........;.........·~ ........... !........... i ..........·!·.......... -~ . ' .........!........... ~ ..........!........... ! '.......... , = = = =

······..··•;·········••: ..... ····;.·..········'.········..•..i••·----····;.······· .:

~i = I I ...........t·•·······..~----· = --~ ........... ...........r...........i........... f ......~

: \ ; ; :

l : : .j :. .j

--~ ........... l...........r.........

; : ; + l~I I If It I i - i - . : \ l 1 l

=

:.

.

~ ...........

I ;

.

-20 0 20 QO 60 80 100 PERCENT OF FULL SCALE YALUE

AIRCRAFT SOUNDING AT PIRU

( 1539 PDT)

October l , 1980

SANBCJX STUDY TAPE/PASS, 185/11 DATE, 10/1 /80 SPiflqL RT P!!INT 6 TINE, 1539 Tl! 155Q (PDTl

Q000. 0 -1.u.u..._...._......_... .............. ...._........_.........._...._..._...,_.._.......,.... .............. .u........u..i..i..i..,.._"-!,.._.,.U+.

300D.O

:;;., z:

20~0.0!: .. ... ~ -' a:

1000.0

o.o

·········:--·········:·········••:••·········+·······1···········:···········: ········1···········>········'···········: .........

'. '. i : '. : '. i : : ! ............ ...........!·······..··:·----------!··......... :•··· ..·····!··--·----·:···········!.......... : ...........! ........... :,-·········,- . ' ;·· ; i : : ' ! '

. . .. . . . . . . ! t ••~ .........,\ ""'""'""r••••----•· ~ , ......... ,

:;~linl-i...........i........ :... ~ ·····i··········1··········· ~ ~ . . \ i . ~ : : :

FULL St:ALE YALUE

(3 TEHP SO. DEG. C

► SI!;, 100. PPB

+ Ba, 1000. lo-' H•I

821201.0 17,01:58

FULL SCALE YRLUE

(3 TEMP so• DEG. C ► NI! 200. PPB

+ NO, 200. PPB X 0. 500. PPB

-20 0 20 40 60 60 100 PERCENT OF FULL SCALE YALUE

821201.0 17•01,58Fig. 4.6.10

C

The spiral at Santa Paula Airport (Figure 4.6.11) at 1600 POT shows the presence of the marine air intrusion even more dramatically. The s~rface temperature is shown as 27°C (81°F) in contrast to the more strongly modified marine air seen at Piru. The depth of the layer is indicated as about 200 m. Peak ozone concentration in the marine air was 13-14 pphm with values of 9-10 pphm aloft.

The sounding in Figure 4.6.12 was made over the water at Ventura Marina at 1707 PDT. An intense surface inversion was present due to the warm temperatures aloft and the cool water temperatures at the surface. Pibal observations at the same location showed a shallow layer (150m) of southwest winds capped by a deep layer (to 1900m) of west to northwest winds. Northeasterly winds beg~an at 200.0 m-msl. __

Two layers of pollutants were present in the air moving onshore from the southwest. Peak ozone values of 16-17 pphm were observed. Aloft ozone values ranged from 8-9 pphm in the layer that was moving onshore from the west and northwest. The effects of this upper layer have been previously described at Simi and Piru.

The sounding in Figure 4.6.13 took place at Santa Susana Airport (Simi) at 1746 PDT. The temperature structure shows a slight inversion at about 700 m-msl which represents the intrusion of marine air. Peak ozone concentration in the marine layer was about 14 pphm with gradually decreasing values aloft. Peak surface ozone concentration measured at Simi was 11 pphm at 15 PDT. Upper wind measurements at Simi showed a layer of westerly winds from the surface to 263 m topped by a layer of northwesterly winds to 1300 m-msl. Above this 1evel winds were from the northeast. Comparison with the soundings in Fig. 4.6.13 indicates th~t the ozone levels decreased in the layer at northeasterly winds. ·

The sounding made at the west edge of the San Fernando Valley (Figure 4.6.14) at 1805 PDT is notable primarily in comparison with a similar sounding on September 28 where peak ozone values of 22 pphm were observed at a level of 1000 m-msl in southeasterly winds. On October 1 winds at that level appeared to be from the northwest and no similar peak was observed.

Figure 4.6.15 represents a horizontal traverse at 122 m-msl beginning at 1842 PDT on a direct line from Ventura to Santa Barbara. Ozone concentrations varied markedly along the route with a minimum of 9 pphm approximately in the middle of the traverse. The same pattern was apparent in the bscat and S02 traces while NOx followed a somewhat different cha racteri st i c.

The final sounding was made at 1857 PDT near the coast at Santa Barbara (Figure 4.6.16). Although there was a low-level inversion present to 300 m-msl, there appeared to be no accumulation of pollutants in this layer. Average ozone concentrations were about 7 pphm to 1800 m-msl, indicating a relatively high background level throughout the area.

4-120

. : . : : .

,... , . ; I j . :

TAPE/PASS, 185/12 DATE, 10/1 /80 SPIRAL AT P!JINT 7 TIHEt 1560 TO 1612 IPDTl SANBOX STUDY

ij000,0-,..._._,_,_,_...._..._.,-!""..._....,....._..._ ...... .._..._.-!-'...._..._....,.._.""-!...,._,_,_,_...._.._.,......._._,_........._..._.,.._..._.-+-

. . ........... r........... j.......... : ..........!.........: ..........:.........: ...........!........ : ........:............~ ........ sooo.o ........... i...........i........... i...........:........... i...........i........... :...........i........... j...........i........... :..···......

FULL SCRlE VALUE

G TEHP SO, OEG. C........... ,..........!.......... :....... _..!.........,! ...........!.......... !...........!......... ! , .......;........ ! ......... ....,, ► Sil, 100, PPB,r:

+ Bmn 1000. lo-f M•I!: ' 2000.0 i i .1 ! I I . i ij ,1"'C ;:! ;:: ....I.. ::J=J:::··,:=;: ]::[: :::· ; ··: '. ....1000.0

.......... 1......·...1..................-:-........ l".........I......... T.........T...................:.......... : .......... 0.0

-20 0 20 ~o so 80 100 PERCENT OF FULL SCALE VALUE

821201.0 17,01,58

AIRCRAFT SOUMDING AT SANTA PAULA

(1600 PDT)

October l , 1980

TAPE/PASS, 185/12 ORTE, 10/1 /80 SPIRAL AT 1'1!INT 7 TIHEt 1560 T!J 1612 IPDTl SANBOX STUDY

qooo.o -,,.1.,1,.1.,1-'-'-'-'-'-'u..1,,1,.'-!-w. .............................. ,....,.1.,1-'-!-'-'-'-'-'-'-'-'...._u.. ............................ .i-+--

. .

sooo.o ::::••:....[:] :::r ::: :'•:: := L:••~::::::: :: .·:i:::•••••:•• FULL SCALE VALUE

G TEMP so• DEG, C ..:::; ► Nil 200. PPB,c

+ NO. 200. PPB2000.0!: ••~.:::•••1 ::- r··1=:::;:~:c::::r~:•~•::~•:•:•••:•:::•1••: X Ila S00. PPB"'C

::,

.. ,_ ...........t......... ··r..........;,...........!"......... -:-- .......l...........:, ...........:..........l..........;:: ....I

1000.0 ···········-··········· . . '

- . . . , .: : o.o

•20 20 ~o eo PERCENT !IF FllLL SCALE VALUE

BO 100

Fig. 4.6.11 821201.0 17,0hSB

4-121

. . .

i ; i :

0 20 llO 60

SANBOX STUD'!' TAPE/PASS, 185/lq ORTE, 10/1 /80 SPIRAL RT POINT 1 Tl HE 1 1707 TO 1723 (POTJ

;ooo. o-,..................,.....,.....,...._...._......_.....,"'"'".....,_......_..................................,....,....,......,.....,......,..............,......,.....,.........._+-

: . . : : . ........... ...........i............~ ..·..·······:···········; ...........!·······--·· ~ ........... i··········· ~ ..........i........... ~ ·•·········~ : : : : : : : . : :

···········i···········;........... ...•...•.• ...••.•.•.. i...........=.......•... l...........:........... i...........1........... j...........= =!000.0 : : . . : : :

···········1··········+·······1 ········:···········t ·········1···········~···········1·········· 1··········:··········1 .......... : : : : . : : . :

2000.0 : . ; ; ; ; ; ; : ; ; ~ I . :- : ~ l

: : : : : · I ········i··.···....·1 ........·1·.......... ! . .··:·........·1·........·:......... ·~

=

..........

1coo.o . . : ~ ~ ~ ~. ~ ~. ~ i ! ~- ~ ·........... ~ ........... ~ ........... ~ - .... I........... ~ .......... ~·····--·· ...

o.o

FULL SCRI.E YRl.l/E

GI TEHP 50. DEG. C

► so, 100. PPB

+a.... 1000. Ill"' M-1

-20 0 20 ~o so 80 100 PERCENT !IF FULL SCALE VALUE

AIRCRAFT SOUNDING tJEAR VENTURA. MARINA

(1707 PDT)

October l ,1980

SANBOX STUD'!' TRPE/PRSS, 185/Iij ORTE, 10/1 /80 SPIRAL RT POINT 1 TINE, 1707 TO 172S (POTJ

qooo.o _,......,..l..l...l..l...l..l..i.....i........_......,......,...;......_....._.............._...._._._!----'-'....._.....,........,...,......_....._.__._........._ .........-,-

821201.0 17,01,58

FUI.L SCRU YRI.UE

GI TEii!' 50. DEG. C

► NO 200. PPB

+ NOx 200. PPB

X 0, 500. PPB

3000.D

a :c

2000.0

1000.0

o.o

1i i I i : l ! i : i · l, : 1. : : : : : ; l ........1 u ~ ....... :- .......... ; ........... : ........... i""......... ; ...........!.n..•••••j ...........;.......••••: ••••• ..••..;........... ~ •••ouoou•l

: :

l := : = = = ... i : i I

1 :

1

1

! :·......1 ·········•·> ······••· .. .•....• i···········!···········1 ..... ···+·········· i···········~··········· i...........

: : : ····i··········•i·••·········:···········

80 100 PERCENT UF FULi. SCALE VHLUE

Fig. 4.6.12 821201.0 17,Gl:58

4-122

3

SANBOX STUDY TAPE/PASS 1 185/17 DATE I I 0/1 /80 TIHE, 17q5 TD 1801 !PDTlSPIRAL AT PeINT 10

ijQOO. 0 -l..u..u.J.J..u..i..1-1..U..j,,J.,.U..U.J..l.....i..i..,!,.U..U.~.U..U..U..U~..i....i..!-,,L-U...L.!-.U..U.,i,,,L,,l,,,l,,.l.j--

. . . . . ••••••••• .. :•••• .. • .. ••i•• .. ••••••--=••• .. •• .. •••:•••• ...... : ........uj .......... -;, .......... i••••• .. ••••:•••••• ....••i .. ••••••••••=•--•••--•••: . l = : . : . : = =

300D.O : : : ; : i ; : : : : ::;., · i \ : ! : \ : I I I lz:

= . • = ···:···········'···········'···········l,.···········i···········2000.0 ~ .. : . ~ I i : : . -·: . . . 0 :;,... •••••••••«~•••••••••.. •~••••• 0000':.. 000HHOO••~••·••••••••r••••••••· ..1•••••••• ..•j••••• ••••1••ooonoooo ( •••••••••i•••••••ooo ~ ••O•oO•no;: ..J a:

1000.0 ···········-················ : : : : : : ~ ~ ;1

, l l ..........._;=.·,............ ~,........... . ........!-----·-··-- ~ ...........;........... j ·--········!···I ....· 1 ·.......... ~ ........... -~ -..........l ·: =

o.o

20 ij0 60 80 100 PERCENT ~F FULL SCALE VALUE

-20 D

AIRCRAFT SOUMDING AT SAN:;; SUSANA

(1746 PDT) October 1,1980

TAPE/PASS, 185/17 DATE, 10/1 /80 SPIRA~ AT POINT 10 TIHE, 17ij6 TD 1801 IPOTJ SANBOX STUDY

qooo.o ...,,..._...._....._........1..1......._~........1..1...u......_,1.,1....u..uu......_.u.........J..j........_...,_.....u..u~u.-

........... .: .......... j........... : ........... j ........... ; ........... j........... : ......... ;............: .......... ; ........... : .......... .

sooo.o I : j ; ; : i I i ; ....., ........._.,.....,., .....• ..••=•••.........,_n,n- ■ u ! •noououolouunnu: ....... •••l•••••• .. •••••••••••••••• ..••n• ■ -n-;-,nuuo•o•

::;., : i l . l 1 1 l ~ . iz: 2000.0

... ~

1

:::;, ........ ; .. L : ........... i__:.......... '. ........! .. \ ..'. , ••.••• ... ..J a:

1000.0 ···········;··········

TAPE/PASS, 185/18 ORTE, 10/1 /80 SPIRAL AT POINT 11 TlHE, 1805 TO 1816 IPOTJ SANBCIX STUD'!'

~000.0 _ ............................................................................................................................................................................. _

: . : . . . : ···········:···········:···········1···········:············:·········•·i••··········'············:···········:··········•i••·········\············

3C00.0 : ; i : i ; : : ~ : i . .

. . =···········r········· : ·········t·· ......... : ········i··········· :···········1··········i ..........

: :

FULL SCALE VALUE: i : \ : . : . : : :

(3 TEHP 50. DEG. C··•··•·•· ········r·····i···········(......... l ........r.........:.........! ........... = 1..........1 ........... ; ...•...•••:::;., II> SCI;, 100. PPB:z:

+a-, 1000. 10--0 M-l2000.0 i i i ~ : ; ; : : :!: w

;::Q

;:.., "'

1000.0

o.o

-20 0 2Q qo so 100 PERCENT Of FULL SCALE VALUE

821201.0 17:01:58

AIRCRAFT SOUNDING - WSAN FERNANDO VALLEY

(1805 PDT) October 1,1980

TAPE/PASS, 185/18 ORTE, 10/1 /80 SPIRAL AT POINT 11 TIHE1 1805 TO 1816 (POTJ SANBCIX STUD'!'

iooo. o...,.....,.....,..........................._.........._.....,.....,.....,---+.....,,..._...._...._...._.""""...._...._...._...................,.._._.............._...._......,_

·········r··········!·····•...··:··········r········••: ········•···········'···········!···········:···········j·· ········: ..........

3000.0

FULL SCALE VALUE: : '. i I : : I l l '. (3 TENP 50. DEG. C·········= • ·······!·······.... :··········r'······r ·······-r··········: ...........!........... :···········!··········· :··········· ..,.,

;,::

+ NO,: 200. PPS2000.0 : : . . :!: xc,, 500. PPB

:::g

: : . . . : : unu: """u•n•h~H••--•--•• ~ •• ••••••••!••n--••oo: ......... ••~•••"""""""": """"""""""' ......, : : :

"' 1000.0 \ : : . : : : :

. .. .. .. . . . ··········1···········:···········:···········t····

o.o

-20 0 20 ~o 60 80 100 PERCENT OF FULL SCALE VALUE

821201.0Fig. 4.6.14 17:01:50

4-124

·SRNBOX STUDY TAPE/PASS, !85/20 DATE, 10/1 /80 TRAVERSE FRON POINT I TO POINT 12 1122 N NSLJ TINE, 18ij2 TO 1856 !PDT!

; i : : : : :............~ ...........l........... ~ ....... ....... ~ ...........i .......·····[ ...........!····· ...... j ..••.••....

o.o

., 12.s ..co FULL SCALE YALUE "' (3 TEMP 50. DEG. Cl!; ffl .,, ► NO INOP::0

§l! 2S 0 200. PPB; ; ; ..... !..........;........... ;............~,, ···-······· i............,, . 500. PPBz ~ . - -~ ... a

: :[ ::: [ · , : ,- · : , S7.S

. . . , . . ! I i- '. ; i l i I T i \ 1 l \ l

: j ~ ~ 1 ~ ~ ! 50.0

-20 0 20 qo 60 80 100 PERCENT OF FULL SCALE VALUE

821201.0 17101158

AIRCRAFT TRAVERSE - VENTURA TO SANTA BARBARA

(1842 PDT)

October 1 , 1980

SRNBOX STUDY 185/20 10/1 /8DTAPE/PASS, DATE, TRAVERSE FRl!N POINT 1 TO l'CINT 12 1122 M NSLI TIME, 18q2 TO 1856 IPDTI

o.o

; :

C,

::1.. :; ••••••••• ,... : :: :: .•.•• ,.••••••••••12.5 ~.. z n ffl .,, .~ ...........,..ll ·:•>•..•..•••••:••• ••• ' + -1 -: r••••••••••::0 ~ 25.0 a ..z a

; ! : l S. -.·.r.·.·.·.·.·.·.·.·.·.·.·.!.i,·.·.·.·.·.·.·.·.·.·.·.:,,·.·.·.·.·.·.·.·.·.·.·.1.. ······················:,,... ·.·.·.·.·........... :!: 137.S

1: l . .,. . ........... ~ ........... l-- ......... 1-...........i -.......... ~ ..........·j......-...-~ ...........i........... ; ..........l·.......... -~ ..........

: : :

so.o

··········· >-·· : :••····••! :

~ :, -:: J.:.• ........

. .......... ; .......... , ......... -: ...........l••········ ........... I .......

···········!-! ········

FULL SCALE VALUE

(3 TENP so. DEG. C ► DEN PT INOP

+ TURB

-20 0 20 qo so 80 100 PERCENT OF FULL SCRLE VALUE

821201.0Fig . 4 . 6 . 1 5a !7,0lt58

4-125

37.5

0 20 ~o so 80 100 PalCENT OF FULL SCRLE VALUE

821201.0 17,0l,5B

AIRCRAFT TRAVERSE - VENTURA TO SAiHA BARBARA

(1842 PDT) October 1 ,1980

Fig. 4.6.15b

SANBC,X STUD'f TAPE/PASS, 18S/20 ORTE, 10fl /BO T'IAVEHSE Ff!OM POINT I TO PeINT 12 !122 N 1151.J TIHE1 18~2 TO 1856 IPOTI

o.o

···•······-r··········i···· ······j············i············:············i·········:·+···········

i .. i ·····r--······:·:···········t········:···········t-·········· ············1············1···· ······1···········-!-·········t··········i·········

SANBOX STUDY TAPE/PASS, 185/21 DATE, 10/1 /80 SPIARL RT Pe!NT 12 TIHE1 1857 TO 1911 (POTJ

2000.0-,...1.1,...1.1,-!,,,,1,.&..1,.1..!,.l..l..l..l..l..l..l..l."-!-,l,.l,.,l,.I,. ......................................................... ""-! .................................. ;-

.. :..........,......... l..········r········ '······.·.·.·.·..··.1.·.·.·..··..··.·.·.·.·.:..··.·.·.·.·.·.·.·.·..·:,,,···················.·.:,.:.··.·.·.·..·.··.·.·.·. 1500.0 ··\····..·····t········1·······•...:........... ;..

.,::i ::::::::::.~.::::::::::::. ·····1 ·········r······· 1··········r········~········ ·!········!··········r...... ,...........z 1000.0!:

... C, ~1 : : : I , : : , ;:: .J a:

~

······-,·······• ...... ·•'~•~~, _r:~ ': '• i•••···· T~' .......'··••:soo.o : j :· .

. : . . : . : : : ., ··········:···········:--·········!········· r··········!······~ ... _..•r··....... :···········

o.o

-20 0

AIRCRAFT

SANBOX STUDY SPIRAL AT PeINT 12

2000.0-;........................................ _ ................................................ ""-! ............................................................... -+-

. : . . . : . . . r· ·······-r····..··r·········-r········· ,............,............, .......r·········: .................... ,.,..........: . ....

[ I i .

···········-················

·········\···········l···

··········-·········

1500.0

::i., ;c

• 1000.0!: ... C,

~ ...