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rVAO-A083 779 SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA F/G 8/3PROFILES OF VELOCITY AND TEMPERATURE NEAR TH4E INDIAN OCEAN EGU-ETC(U)MAR 80 R A KNOX, M J MCPMADEN N00014-75-.C-0152

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DD ~~ 1473 SECURI Ga.Y CLASSIFICATION/ NGE hflDt teed

MANADATORY DISTRIBUTION LIST

FOR UNCLASSIFIED TECHNICAL REPORTS, REPRINTS & FINAL REPORTS

PUBLISHED BY OCEANOGRAPHIC CONTRACTORS

OF THE OCEAN SCIENCE AND TECHNOLOGY DIVISION

OF THE OFFICE OF NAVAL RESEARCH

(Revised July 1978)

Department of Defense Naval Research Laboratory (6)Library, Code 2620

Office of the Secretary of Defense (3) Washington, D.C. 20375Assistant Director of Defense Research& Engineering U.S. Naval Oceanographic Office

Washington, D.C. 20301 Library, Code 8170NSTL StationBay St. Louis, MS 39529

Navy

Office of Naval Research (3) Other Government AgenciesCode 460Arlington, VA 22217 Defense Documentation Center (12)

Cameron StationOffice of Naval Research Alexandria, VA 22314Code 480Arlington, VA 22217 National Oceanic & Atmospheric

Administrat ionOffice of Naval Research National Oceanographic Data CenterCode 102 B Washington Navy YardArlington, VA 22217 Rockville, MD 20852

Office of Naval Research (6)Code 102 DIArlington, VA 22217

Office of Naval ResearchCoumanding Officer1030 East Green StreetPasadena, CA 91101

Naval Ocean Research & DevelopmentActivity

NORDA, Code 300NSTL StationBay St. Louis, MS 39529

University of California, San DiegoScripps Institution of Oceanography

PROFILES OF VELOCITY AND TEMPERATURE NEAR THE

INDIAN OCEAN EQUATOR

by

R. A. Knox and M. J. McPhaden

March 1980 SIO Reference Number80-6

(revision of 76-11)

L . . . .. . . . ... . ... ....- . . .. . .. . . - . . . .. .. . . - " T .. .

This report is a revision of SIO reference number 76-11. It corrects

a programing oversight in the calculation of relative deep velocities which

were used to produce absolute velocity profiles. This oversight lead to

significant errors in the original report in only three cases. Deep zonal

velocities calculated for 19 April and 28 December 1973 were too small by

29.3 and 49.3 cm/sec respectively; that of 28 June 1973 was too large by

26.6 cm/sec. In all other instances, errors were below the 25 cm/sec

noise level.

AAcce sion For .

DItusti '' /i-I-"

BYo

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I Avail butot

Dt speclal

INTRODUCTION

Between January 1973 and May 1975, quasi-weekly vertical profiles of

temperature and velocity were obtained near the equatorial Island of Gan

(000411S, 73*10'E) in the Central Indian Ocean. This report presents the

profiles directly. One analysis of the data, treating the seasonal cycle

of near-surface currents, has been published (Knox, 1976); others are in

progress.

METHODS

A full discussion of techniques and errors is given by Knox (1976)

but a brief summary follows for convenience. The profiles were made using

the profiling current meter (PCM) described by Dlng and Johnson (1972).

Lowerings were made once per week, barring instrument failures and/or higher

priority duties for the personnel of the Royal Air Force base on Gan who

carried out the work. Sites for the lowerings were alternated weekly between

points 15 n.mi. north and south of the atoll, due to considerations of inter-

ference to the current by the atoll (Knox, 1974; 1976). Measurement of ship

drift, not successful on all profiles, was by radar tracking from Gan; use

of these occasional tracks and an interpolation scheme to convert the PCM

relative velocities to absolute velocities is discussed by Knox (1976).

DATA REDUCTION AND PRESENTATION

Data from the Aanderaa recorder In the PCM were converted to scientific

units as follows:

2

1. Pressure. The manufacturer furnishes a linear calibration equation

relating recorded counts to applied pressure. His value for the slope was

used throughout, and by checking against a deadweight tester during the final

months of the project it was found not to have changed. The intercept

(reading at atmospheric pressure) did change sporadically, and was individually

noted for each profile.

2. Temperature. Manufacturer's calibrations were used throughout.

3. Speed. Manufacturer's calibrations were used throughout.

4. Compass. A deviation table was constructed for the instrument, and

during the project the compass was checked against known headings. No shifts

in calibration were found.

With these calibrations, the data from each lowering were converted to

a series of 4-item samples: depth (m relative eastward velocity (cm/sec),

relative northward velocity (cm/sec),and temperature (°C). A few obviously

bad values were manually edited by linear interpolation. Ship drift components,

either directly measured or inferred from the relative deep velocities as

discussed by Knox (1976) were added to the relative velocity data to produce

the final series. The depth interval between samples depends on the sinking

speed of the PCM, and hence on current speed and wire angles. All data samples

are plotted, so on profiles with slow sinking speeds there appears to be more

small scale vertical structure than on those with fast sinking speeds. Velocity

errors are considered by Knox (1976); ± 25 cm/sec is a conservative overall

estimate.

Each page presents for one lowering the three profiles (temperature,

eastward velocity UVEL, northward velocity VVEL) plotted against depth. The

lower right corner gives the date, an identifying number, and an approximate

location. Also plotted are one week average wind tress vectors from standard

meteorological observations on Gan, as discussed by Knox (1976).

3

ACKNOWLEDGEMENTS

This work would not have been possible without the goodwill and competent

collaboration of numerous men of the Royal Air Force and the British 4eteoro-

logical Office who were stationed on Gan. Support of the Office of Naval

Research through contract N00014-69-A-0200-6006 to the University of California,

Scripps Institution of Oceanography, is gratefully acknowledged.

REFERENCES

Duing, W. and D. Johnson (1972) High resolution current profiling in the

Straits of Florida. Deep-Sea Research 19, 259-274.

Knox, R. A. (1974) Reconnaissance of the Indian Ocean equatorial undercurrent

near Addu Atoll. Deep-Sea Research, 21, 123-129.

Knox, R. A. (1976) On a long series of measurements of Indian Ocean equatorial

currents near Addu Atoll. Deep-Sea Research, 23, 211-221.

44

o 0 20 0AVE-WIL VVPEL

(CM/SEE)SZ CM/SF* EKECN

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0

C 3 3

UVEL VVEL(CM/SEC) (CM/SEC)

T

C-

ic 2C 30AVE- WIND STRESS

(Y.NE/So CM)FCR WEEK ENDING

25/01/73

a.E

s2, -1S

3- 25/01/73TEMP NO. S41 3

(DEG. C) 3OKM N

L.

6

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UVEL VVEL(CM/SEC) (cM/SEc)

I-L

10 20 30AVE. WIND STRESS

(YNE/SQ CM)FCR WEEK ENCING

01/02/73

1 W I

S

3- 02/02/73TEMP NO- 541 4

(DECEL) 19KM S

-ICo lCo E -5c 9C N

2 2

00

UlVCE L VVE L(CM/8EE) (EM/EEC)

10 20 3037+ AVE- WIN STRESS

(DYNE/SO CM)FCR WEEK ENCINC-

01/03/'73

-I-1 W

3- 01/03/73TEMP NO- 541 5

(~EG~ C)30KM N

-10100 E -50 S0 N

0o 3-

UVEL VVEL(CM/EC) (EM/EEC)

10 20 30AVE- WIND STREEE

(DYNE/SO C:M)FOR WEEK~ ENCINO

0-8/03/73

2--1 S

3 08B/03/73TEMP NO- 541 G

(DEG- C) 24K~M S

-CO E -50 SC N

2 C-

00 3

U VEL VVEL,.4 (CMSEC) .( CM/SEC')

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(DYNE/SO CM)FOR WEEK ENCING

15/03/73

1 E

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31 5I/03/73TEMP NO, 41 7

(5EGo C) 30KM N

I.A

10

-icc lc E -5C 5C N

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(DYNE/O CV)FC WEEK E NCTN

29/03/73

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FCjWEK NDIN

11

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2Ii.-C-

10 20 30AVE- WIND STRES

(CYNE/SO CM)FOR WEEK ENCINO

05/04/73

N

3 05/04/73TEMP NO- 541 10

(DEG C) 24KM S

12

-100 loC E -50 SC N

ii)100 3 3

U---J\UVEL VVELF( CM/EC) (EM/EC)

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171

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10 20 30.-. ,AVEo WTNO STRESE

(OYNE/SQ CM)FOP WEM ENEINS

12/04/73

2 -1

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31 IE/04/73

TEMP NO. 541 11(DEC, C) 30KM N

L

13

-100 100 E -50 SO N

0

o 3 3


•*

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(DYNE/SQ CM)FOR WEEK ENDING

19/04/73

11 E

2-- S

3 13/04/73TEMP NO. 541 12

(DEG. C) 23KM S

L L. .,. ... l .-

14

-100 00 E -50 50 N

22

C D 3 - 3 -

UVEL VVEL(CM/SEE) (CM/SEC)

T

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10 20 30SAVE- WIND STRESS

(cJYNE/SQ CM)FOR WEEK ENDING03/05/73

N

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3 03/05/73TEMP NO. 542 1

(DEG. C) 16KM S

r PI _..

15

-±00 100 E -50 50 N

2 2

0o 3 30-31 UVEL

VVEL(CM/SEC) (CM/SEC)

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10 20 30AVE- WIND STRESS

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10/05/73

N

2 1

3 11/05/73TEMP NO, 541 14

(OEGo C) 30KM N

16

-100 100 E -50 50 N

2

UVEL B VVEL(ECM/SEE) (EM/SEE)

Ld

10 20 30AVE- WINO STRESS


17-105173

N

3-- 17/05/73TEMP NO. 541 15

(DEG~ E ) 32YKM S

iL 0

17

-Icc l00 E -50 5C N

LJVEL V VEL31 (EM/SEE) -- (CM/SEC)

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10 20 30AVEr_- WTNC STESS

(DYNE/SQ CM)FCR WEEK ENCT NS

24/C5/73'

N

3- 24/05/73TFMFP NC- 541 16

(CECG C) 30KM N

18-100 100 E -50 ,50 N,

0 3

UVEL I VVEL(CM/SEE) { (EM/SEC)

T

0

AVE- WIND STRESS(DYNE/SO CM)

FOR WEEK ENDING31/05/73

N± it

e +E

3 01/0/73TEMP NO. 548 2

(DES C) 24.KM S

19

-1Co 100 E -50 SC N

2

0oD 3 31

LJVEL VVErL(cm/EEC) (CM/SEC)

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(CYNEzSO CM)FR WEEK ENCTINC

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(DYNE/SO CM)FR~ WEEK END INC

14/05/73

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(OEG C) 24KM S

21

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200I I AVE. WIND STRESS

(CYNEC/SO CM)FOR WEEK ENCINC

28,/06/73

N

31 2/06/73TEMP NO. 541 17

(DEG - C) 24KM S

22

-10100 E -50 90 N

23

0o0UVEL VVEL

H(EM/EEC) (EM/EEC)

10 20 30I I .1AVE , WIND STRESS

(DYNE/SO CM)RCR WEEK ENDING

CS5IC7173

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2--1

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(EEC> C) OVM N

23

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2

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T

10 20 30

AVE. WINO STRESS(DYNE/SQ CM)

FCR WEEK ENCIN212/C7173

2- W4

12/07/73TEMP NO. 541 13

(DEG. C) 28KM S

24

-iC 00 E -5c sc IN

i 1

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UVEL V V L(CM/E) (cm/sFLc)

T_

10

I AVER W INCI STRESS~C YNE/&SO :M,)

ROCq WEEK ENCItZ3IS/C7 /73

2 -1

TEMP NO- 541 20(DEG- C) 30KM N

25

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--o 3- 3.

UVEL VVEL(CM/EEC) (CM/SEC)

nH-L."

L0 20 30AVE- WINO STRESS

(QYNE/So CM)FOR WEEK EN&ENC

26/07./73

N

C-1 E:I

3 25/07/73TEMP NO. 541 22

(DEC, C) 24KM S

26

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(CM/SEC)

I


(CYNE/SO CM)FOR WEEK ENOINO

02/06,/73N

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3 02/08/73TEMP NO- 941 23

(DEGr C) 3CKM N

27

-100 100 E -50 50 N

2 2-

o t ii . i i:t 1 1 11 1

0 3 3

LUVEL VVEL(CM/SEC) (CM/sEC)

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(OYNE/SQ CM)FCR WEEK ENDING

09/06/,73

N

1 1

a? E

3 03/0/_73TEMP NO 541 24

(EEG. C) 24KM S

~' ~'

28

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o 3LIVEL VVEL

4- (CM/EC) 4-(CM/EEC)

T


(FJYNE/S0 CM)FR WEEK ENDING

16/0B/73

N

-1

TEMP NO - S41 EE(OEE C) 3CJKM N

29

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UVEL VVEL4- (CM/EEC) 4-(EM/EEC)

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(OYNE/so CMI)FOR WEEr-K EIN(-

30/08/73"N

1- 4 1

-1

3- 30/083/-73TEMP NO. 541 27

(DEG, C) 30KM N

30

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2-2

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TI-C-.

10 20 30', AVEa WIND STRESS

(CYNE/SO CM)FCR WEEK ENCINE

06/03/73

N

2 . ; 'E

3 06/03/73TEMP NO 541 29

(DEG, C) 24KM N

31

-IoC 100 E -50 SO N| r • i • • w ! i r i i • i

11

2- 2

0o 33

UVEL VVEL

T

Ln

10 20 30' - :,AVE. WIND STREEE

(CYNE/50 CM)FCR WEEK ENCTIN

13/C3/73

N

lz + E

3 13/03/73TEMP NO, 542 6

(DEG. C) 30KM N

32

-100 100 E -50 50 N

2- 2

0o 3- 4

LIVEL VVEL(CM/SEE) {(EM/SEE)

Lil

1-0 20- 30

AVE. WINE STRESS(DYNE/SQ CM)

FR WEEK ENDING20/09/73

N

3 20/09/73TEMP NO. 542 7

(DEG, C) 26KM S

33

-icc 00 E -50 50 N

2--

0

o0 3-L, VEL VVEL

(fCM/SEE) (CM/SEC)

TI-n0_LLI7

10 2 30.. AVE. WIND STRESS

(CYNE/S0 CM)FGR WEEK ENCINC

27/09/73

N

E2 -

.I

a 28/03/73TEMP NO, 542 8

(CEE, C) 3OKM N

LI

34

-icC 10 E -5sc N

-1 31

UVEL V VEL(EM/EEC) (CM/EC

Lil

10 20 30AVE-. WINE STRESS

tOYNE/sa CMFR WEEK ENCING

04/10/73 L

N

2- E

05/1*'0/73TEMP NO- 542 9

(EEG - C) 24KM1 S

35

-±0 00 E -50 50 N

2-

I UVEL VVEL(HCEM/SEE:) (EM/SEE)

10 20 30AVE- WINC STRESSS

(DYNE/SQ CM)FOR WEEK END ING

11/10/73

2-- E

3-- 11/10/73TEMP NO- 542 10

(CE-C) 0 2KM N

L

* 36

-i CC, E -50 50 N

2 --

23+ 31S LJVEL VVEL

(EM/EED(EM/EEC)

TF-L

1020 30AVE. WIND STRESS

(CYNE/SQ CM)FR WEEK ENCINC

le/10/73

N

11 1

3-- TF13/10/73TMP NO - 542 11

(DE 1 C:) 24VM S

37

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2--

o-- 3+LUVEL VVEL

(ECM/SEC) (CM/SEC)

7n

iC 2C 30AVE- WINO STRESS

(CYNE/SQ CM)FCR WEEK ENDING

E

I

25/10/73TEMP NO. 42 12

(CEQ° C) 31KM N

38

-10C 100 E -50 50 N

2-

o3- 3-

LJVEL VVEL(EM/EEC)(EM/8EC)

10 20 30rlAVE. WINE STRESS

(CYNE/SO& CM)FCR WEEK ENCTNC

01/11/73L

1 E

02/11/73TEMRP NO. 542 13

(EE C) I9KM S

-100 100 E 39 -50 0N

2-

0

UVEL VVEL-~(CM/SEC) (EM/SED)

10 20 30-+ AVE- WINO STRESS


08/11/73

N

1~ E.

3-- 0/11/73TEMP NC- 541 29

(CEG, C) I9KM N

40

-100 I00 E -50 50 N

o 3- 3LJVEL VE

(EM/EEC) +! (CM/EEC)

7

10 20 30I AVE. WINE STRESS

(DYNE/SQ C-M)FCR WEEK ENCING

15/11/73

1

I E

2- S

3- 15/11/73TEMF= NC - 541 30

(CEO. C) 25KM S

41

-£00 £00 E -50 50 N

2-

0 3 --


IC

£0 20 30AVE. WINE STRESS

(CYNE/SO CM)FCR WEEK ENCING

22/11/73

± E

2 -1

3- 22/I1/73TEMP NC. 541 31

(CEG, C) 34KM N

I.|

42

-100 100 E -50 5C N

2 2

0o 3 3

UVEL VVEL(CM/SEC) (CM/SEEC)

2

I0-

C'0 20 30

AVE. WIND STRESS(CYNE./SO CM)

FOR WEEK ENCING2S/11/73

lE

2s

-28/11/73TEMP NO. 541 32

(CEG. C) 27KM S

I Ic

43

-100 100 E -50 50 N

I I I I I I I

2" 2

Co 3

UVEL VVEL4- (CM/SEC) (EM/SEC)

*

IL-

wiO 20 30

AVE. WIND STRESS(OYNE'SQ CM)FCR WEEK ENCINC06/12/73

N

2 E

3 06/2/73TEMP NO, 541 33

(DEG-EC) 2KM N

L --i-

44

-10 100 E -50 50 Nt I I I I I I I It I

1}

2--2 2)

0

0 3 3li UVEL VVEL

(CM/SEC) (CM/SEC)

TI.-Ld


(DYNE/SO CM)FOR WEEK ENDING

13/12/731

1 1 E

2 -1

13/12/73TEMP NO. 541 34

(DEG. C) 24KM S

45

-1CO 100 E -50 50 N

2 2

00 3 3

UVEL VVEL(CM/SEC)O (CM/SEE)

I-3

0

to 20 30AVE. WIND STRESS

(DYNE/SO CM)FCR WEEK ENDING

20/12/73

1 E

2 -a.S

320/12/73

TEMP NO. 542 14± (DEG- C) 28KM N

46

-1cIcc E -sW SC N

o3- 3-

U V'EL VVEL(CM/EEC) (EM/EEC)

10 20 30AVE - WINC ETRESS

(CYNE/So Cm)FCR wEEK ENCIN-

27/12/73

1

3 i2612173TEMP NO. 542 15

(DEG. C) 24KM S

47

-iC0 1Oc E -50 50 N

i :L

UVEL VVEL4- CM/E) (CM/SEC)

*

F-

AVE- WIND STRESS(CYNE/SQ CM)

FCR WEE.,K ENTNC03./01/74

N1 1

2--

3 03/01/74TEMP NO- 541 35

(DEG, C) 30KM N

48

-100 i00 E -50 50 N

C1

UVEL VVFL(CM/SEC) (CM/SEC)

LUJ

10 20 30"\VE- WINC ETRE 3

(CYNE/SO CM)RCCR WEEK ENCING

100174

i E

1 10/01/74TEMP NO. 541 36

(DEG~ - CD25M S

49

-100 100 E -50 s0 N

2 2>0 3 3

-U 'VEL VVEL(CM/SEC) 4 (CM/SEE)

7t-

C-,

10 20 30' AVE. WINE STRESS

(CYNE/SG CM)FCR WEEK ENCINC

17/01/74

+ E

- ' S

3-- 17/01/74TEMP NC. 541 37-- (CEG, D) ISKM N

50

-100 100 E -50 50 N

ii Ii:0

0 31 3--UVEL VVEL

(CM/SEC) (CM/SEC)

I-0_r7

LO 20 30AVE,- WIND STRES.S

(DYNE/SO CM)FOR WEEK ENCINZ

17101/741

1 lE

2- S

3 1B/01/74TEMP NO- 541 39

(EEG, C) 30KM N

-100 100 E -50 50 N

2- 25

LJVEL VVELr4(CM/EC) (EM/SEC)

LiM

10 20 30AVE- WIND STRES

(DYNE/SQ QM)FOR WEEK~ ENOING

24/01/74

1 w-1

3- 24174TEMP NO- 541 39

(DEG- C) 28KM S

52

-100 100 E 52 -50 50 N

1

2-- 2

o 1L

o 3 3

L-VEL VVEL(CM/SEC) 1 (EM/SEE)

IF-0LLU

10 20 30- , AVEa WIND STRESS(DYNE/SO CM)

FOR WEEK ENDING14/02/74

E

2 --IS

14/02/74TEMP NO. 542 17

(DEG- C) 2BKM N

53

-0 100 E -50 50 N

00 3 3+

\ UVEL VVELr ( EM/SEC) (CM/SEEC)

I

nLuJ0


(DYNE/SQ CM)FR WEEK ENCING

21/02/74

-$-I E

t/3 2/02/74

TEMP NO- 542 19(DEG, C) 2SKM S

54

-100 10 -5050 N

JJ

(DI .. I I

o 3 3-.

UVEL VVEL(CM/sEC) (CM/SEC)

I

U-1

10 20 30AVE. WINO STRESS

(CYNE/SO CM)FOR WEE. EN DNG

28102174

1 E

2 - S

TF 2E3,/02/7,4TMP NO .42 19

(OEE3° t_) 3OKM N

55

-Icc iCC E -so SC N

2- 2.

00 3 3-

UVEL VVEL

TI

iC 20 BCAVE. WIND ETRES

(CYNE/So CMR-OI WEEK ENC!TNG

07,/03/74

1'E

2 -'.

3 07/03/74TEMP NO. 542 20

(CEO- C) 24KM S

L

56

-icioG E -50 s SN

LJVEL VVEL4- (EM/EEE) (EM/EEC)

n

10 2 AVE- WIND STRESS(DYNE/90 CM)

ROR WEEKs E!NING21.103174

3 21/03/74TEMP NO~ - 42 22

(OEC' C) 30KM N

57

-Ica10 E -50 SO N

o 3-

UVEL VVEL(CM/EEC) (CM/EEC)

IC 2C 30I AVE. WIND STRESSE

COYNE/SJ CMI,FOR WEEK ENC31NG

04/04/74

N

E

I 3 04/04/74TEMP NO. 542 24

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3 19/04/74TEMP NO- 541 41

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FOR WEEK ENOINGN13106174

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