mipas h2o esabc subgroup hermann oelhaf forschungszentrum karlsruhe –...

ACVE-2 – ESRIN - 3-7 May 2004 – MIPAS-H2O-ESABC – H. Oelhaf

MIPAS H2OESABC Subgroup

Hermann OelhafForschungszentrum Karlsruhe – IMK/ASF

MIPAS-Envisat


Contributions

AVCT-ESABC/Aircraft:A. Fix, DLR-IPA, O’hofen, Germany (Falcon-H2O-DIAL/in situ)C. Schiller, FZ Jülich, ICG-I, Germany (FISH/in situ)

AVCT-ESABC/Balloons:K. Chance, SAO/Cambridge/USA (FIRS-2)W. Gurlit, Univ. Bremen/Heidelberg (CHILD)H. Oelhaf, FZK-IMK, Germany (MIPAS-B)J. Ovarlez, LMD, Palaiseau, France (ELHYSA/in situ)C. Schiller, FZ Jülich, ICG-I, Germany (FISH/in situ)

Others:M. Milz, FZK-IMK, Germany (IMK Proc. vs. ESA Oper. Processor)J. Remedios, Univ. Leicester (Oper. Processor vs. Climatology)


Examples restricted to V4.61 data in generalExceptions demonstrate improvement from previous versions to 4.61Very disappointingly small number of validation cases available so far, due to

• V4.61 data availability restricted to until early 2003 for a limited set of orbits (plus a few data of 2004 added a couple of days beforeACVE-2 Meeting)

• Late delivery of V4.61 data• Other commitments by validation experimenters

Other (non-geophysical) assessments and comp. to older versions addedNo statistical assessment possible/useful so farEvaluation cannot yet be regarded as representative and conclusive (very few cases, missing geophysical conditions etc.)

Nota bene:


Falcon-H2O-DIAL/in situ - A. Fix, DLR-IPA

H20-DIAL Error:

up to 15.5km: <10%up to 16.3km: <20%up to 17.0km: <40%

8 Falcon flightsfrom Forli in Oct. 2002 (mid-lat) matching each 2 MIPAS scans

Match quality: excellent

6 8 10 12 14 16 18 2036

38

40

42

44

46MIPAS Orbit 3404 24/10/02 21:23 UT

Falcon Track

Latit

ude

Longitude

6

9

12

15

18

21

24

25

Tang

ent H

eigh

t [k

m]

10111213141516171819202122

Geo

phys

ika A

ltitu

de [

km]

V4.61 slightlyimproved vs. V4.53Tendency of lowMIPAS bias below~100 hPa


Quality Check: H2O-DIAL vs. Geophysika FISHForli – 24 Oct. 2002 - mid-lat

6 8 10 12 14 16 18 2036

38

40

42

44

46MIPAS Orbit 3404 24/10/02 21:23 UT

Falcon Track

Latit

ude

Longitude

6

9

12

15

18

21

24

25

Tang

ent H

eigh

t [k

m]

10111213141516171819202122

Geo

phys

ika A

ltitu

de [

km]

FISH: C. Schiller, M. Bläsner FZ Jülich

24/10/02, Orbit 3404

CHILD and FISH consisten to eachother within ~ 0.5 ppmv


FIRS-2 Balloon (sub-mm FTS) – K. Chance/SAO USA20 Oct. 2002, 19:35, 34° N (USA-NM)

Match quality: poor> 1000 km > 8 hrs (6:40, 4:30)V4.61 data for good coincidence not yetavailable

MIPAS: low bias vs. FIRSLarge oscillations below 15 km


CHILD-TDL-balloon (in Situ) 24 Sept. 2002 mid-lat.W. Gurlit/UB, S. Rohs/FZJ

Match quality: good< 400 km < 2 hours

MIPAS: low bias ?Very dry tropopause region


GOMOS

MIPAS

MIPAS-B2 flight#11:

• Aire sur l'Adour (F)• 24 Sept. 2002• mid-latitudes, late

summer

MIPAS-E• orbit 2975 (evening)• Scans 2 – 4 (5)

How to optmise balloon-borne single-shot

validation

Forschungszentrum Karlsruhein der Helmholtz-Gemeinschaft


510152025303540455055606570

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

5

10

15

20

25

30

35

40

45

50

55

60

65

70

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Los_tangent latitudeAire sur I'Adour, France 24/09/2002

Rec.2 22:05:08 Rec.3 22:06:29 Rec.4 22:07:50 Rec.5 22:09:11 MIPAS-B Seq. S 21:50 MIPAS-B Seq. N3 22:21

Latitude (degree)

Altit

ude

(km

)

MIPAS-B and MIPAS-E LOS tangent latitude/altitude matches

Flight #11 Aire sur I’Adour France, 24/09/2002



0,1

1

10

100

-3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12

-3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12

Aire: 24 September 2002 Seq. N3 MIPAS-E (E): 24-Sep-2002 22:07:50 V4.61 MIPAS-E : 24-Sep-2002 22:07:50 V4.55 MIPAS-B (B): 24-Sep-2002 22:21:42 Absolute Diff. (B-E) Combined errors

MIPAS-B errors: total 1-σ uncertaintyMIPAS-E errors: only noise error

Absolute difference (ppmv) H2O VMR (ppmv)

Orbit 2875Rec.16 - North

Pre

ssur

e(hP

a)

MIPAS-Balloon – H. Oelhaf, FZK-IMK24 Sept. 2002, ASA, mid-lat

V4.61 improved vs. V4.55Too dry hygropausein MIPAS-E (v4.55)MIPAS-E profiles still oscillating above ~ 30 hPa


MIPAS-B

Match quality: excellent< 100 km, < 20 min


ELHYSA balloon – J. Ovarlez, LMD Kiruna, 16 Jan. 2003, inside vortex

10

15

20

25

30

1 3 5 7 9 11 13 15

ELHYSA MIPAS MIPAS

Kiruna 16 January 2003 Inside the vortex

H2O Mixing Ratio ( ppmv)

Alti

tude

(km

)LMD

Good agreement apart from slight oscillations

Orbit 4606Scan 3: □Scan 4: ∆

Data version: 4.55 (?)



ELHYSA balloon – J. Ovarlez, LMD Kiruna, 11 March 2004, outside vortex

Orbit 10618, scan 20, V4.61

LMD

Match quality: very good< 200 km, <1 hour

Excellent agreement apart from lowermost and uppermost point

10

15

20

25

30

35

0 2 4 6 8 10

MIPAS ELHYSA

Kiruna 11 March 2004outside the vortex

H2O mixing ratio (ppmv)

Alti

tude

(km

)


MIPAS-Balloon – H. Oelhaf, FZK-IMK24 Sept. 2002, ASA, mid-lat

Match quality: excellent

< 100km, < 0.3 hours


Total hydrogen(H2O+2*CH4)

100

10

1

-3 -2 -1 0 1 2 3

-3 -2 -1 0 1 2 3

Rec.16 - North

Difference (B-E) Combined errors

Absolute difference (ppmv)

Pres

sure

(hPa

)

4 5 6 7 8 9 10 11 12

100

10

1

4 5 6 7 8 9 10 11 12

Engel et al., 1996Hmean Winter 1991/92

Hermann et al., 2002Hmean Winter 1999/00

Aire: 24 September 2002 Seq. N3 MIPAS-E (E): 24-Sep-2002 22:07:50 V4.61 MIPAS-B (B): 24-Sep-2002 22:21:42

MIPAS-B error bars: 1-σ accuracyMIPAS-E error bars: just noise error

H2O+2*CH4 VMR (ppmv)

MIPAS-B

Excellent agreement up to ~30 hPa> 30 hPa retrieval

instabilities and high bias in MIPAS-E


CHILD-TDL-balloon (in Situ) 24 Sept. 2002 mid-lat.W. Gurlit/UB, S. Rohs/FZJ

Total hydrogen(H2O+2*CH4)

MIPAS data points oscillatingData points within expected rangeLow MIPAS bias at the bottom



C. Schiller, M. Bläsner, P. Konopka, S. Rohs

back- and forward trajectories ± 4dcoincidence limits: r = 100 km, t = 0,5 h

increases statistics:No. coincidences increased by 4-8applicable for non-validation flights (e.g. EUPLEX)

allows for validation at high atmospheric variability

V 4.61 retrieval required for full campaign duration

Trajectory Mapping - Geophysica case for FISH

Allows to increase theno. of coincidences bya factor of 4-8


MIPAS data (pre-V4.61 Versions) vs. ClimatologyJohn Remedios, U. Leicester

Jan. 200320-60°S

July 200320-60°S

What is the reason for the large scatter in July comp. to Jan. 2003 ? (0.1 to 600 ppmv in strato-/mesosphere)


Plausibility Tests and Processor IntercomparisonIMK-Processor vs. ESA Oper. Processor

Statistics covering 18 Sept. to 13 Oct. 2002

M. Milz and IMK-AME Team, cf. Poster by M. Milz


There is a strong need for automatised quality control


Conclusions

Precision of INSTRUMENT species: tbdAccuracy of INSTRUMENT species: tbd

Attempt of an assessment


Inter-comparison aggravated byLack of reprocessed v4.61 data for 2003Statistics still to come

Validation results obtained so far (quality rating: ++ very good, + good, o fair, ? unclear)Balloon

– FIRS-2 20/10/02 mid-latitudes ? coincident data missing, low bias– MIPAS-B 24/09/02 mid-latitudes + oscillations, slight high bias > 30 km– ELHYSA 11/03/04 high-lat. ++ low bias at tropopause– CHILD 24/09/02 mid latitudes o low bias, particularly at tropopause

Aircraft – H2O-DIAL 18-24/10/02 mid-latitudes o low bias < 120 hPa– FISH 24/10/02 mid-latitudes o low bias < 120 hPa– FISH 26/01/03 high lat. + trajectory mapping

Total Hydrogen (H2O + 2*CH4)– CHILD 24/09/02 mid latitudes ? Low bias, particularly at ~ tropopause– MIPAS-B 24/09/02 mid latitudes + > 30 hPa noisy and high bias

Climatology vs. 4.5x versions– Climatology Jan&July ’03 mid-lat. South + (mean), large scatter, seas. inconsistency

Processor Intercomparison (ESA V4.61 vs. IMK processor with level 1-b V4.55)– V4.61vs.IMK 18/09-13/10/02 global o after rejection of lots of spurious data

Generally no clear picture yet (very limited statistics)15-30 km: Most cases within combined error bars (if total error assumed)Low bias in lowermost stratosphereMany physically meaningless data Quality control needed


Acknowledgments

ESACNESSSC EsrangeFU BerlinTeams behind the PIs

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