Welcome to the COST 723 Meeting!

Bern, October 6-7, 2003

COST 723 WG1 Meeting 1, Common Session WG1 + MC

Bern, October 6-7, 2003

Stefan Buehler

University of Bremen

sbuehler@uni-bremen.de

Bern, 6.-7. 10. 2003

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Overall Activities

• Delay due to COST move to ESF

• Web site and mailing lists at http://www.cost723.org

• COST 723 splinter meeting at EGS/Nice– Opening Workshop planned at ESTEC– Date (to be reconfirmed at this meeting):

March 11-13, 2004– Collection of COST 723 related EGS

presentations on cost723.org

Bern, 6.-7. 10. 2003

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WG1 Activities

– Radiosonde• Humidity• Ozone

– Aircraft• MOZAIC• MARSCHALS

– Satellite• AMSU• Odin• Envisat• Champ

• Established contacts to data sources:

• We will learn about ongoing activities in these areas in the next two days (hopefully).

AMSU-B Humidity Data

Stefan Buehler

University of Bremen

Bern, 6.-7. 10. 2003

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Platform Instrument Launch DMSP F-13 SSM-T2 March 95

DMSP F-14 SSM-T2 April 97

NOAA-15 (NOAA-K) AMSU-B May 1998

NOAA-16 (NOAA-L) AMSU-B September 2000

NOAA-17 (NOAA-M) AMSU-B June 2002

Aqua HSB May 2002

Operational Microwave Humidity Data

Bern, 6.-7. 10. 2003

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Figure by M. Kuvatov

Bern, 6.-7. 10. 2003

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AMSUB

Channels

Figure by V. Oommen-John

Bern, 6.-7. 10. 2003

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Wettest day in 2002 (July 17)

Driest day in 2002 (January 5)

Peak altitude of Jacobians gives sounding altitude

Figure by V. Oommen-John

Bern, 6.-7. 10. 2003

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Wettest day in 2002 (July 17)

Driest day in 2002 (January 5)

Lindenberg Radiosonde DataSolid: RH, dashed T, dotted RH_icesat

Figure by M. Kuvatov

Bern, 6.-7. 10. 2003

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Match-up Procedure

• Problems:– Sonde drifts during ascent– Time difference between sonde launch and

overpass

Pixel level comparison not possible

Figure by V. Oommen-John

Bern, 6.-7. 10. 2003

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Solution: Look at a target area, we take a 50km circle.

Striking: Atmospheric inhomogeneity can be a problem.

Figure by M. Kuvatov

Bern, 6.-7. 10. 2003

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Num

ber

of O

ccur

renc

esStandard deviation of brightness temperatures inside the target area.

Vertical lines are from operational calibration.

Figure by V. Oommen-John

Bern, 6.-7. 10. 2003

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Error Model• The 50km inhomogeneity is the

dominant error source. Error model:

i = C0 + 50km

• C0 is small, we take 0.5K.

Bern, 6.-7. 10. 2003

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Comparison Lindenberg radiosonde humidity vs. AMSU-B on NOAA15, time period 2002.

Discrepancies in the UT for very dry conditions.

Figure by M. Kuvatov

Bern, 6.-7. 10. 2003

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Radiosonde Stations in COST 723 Countries (from Met Office Archive)

Figure by V. Oommen-John

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Satellite Data as a Tool to Compare Different Stations

Lindenberg / Germany (Vaisala RS80)

Kem / Russia (Goldbeater skin)

Figure by V. Oommen-John

Bern, 6.-7. 10. 2003

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Conclusions• It is worthwhile to compare operational satellite

humidity data and radiosondes.• Comparison in radiance space avoids inverse

problem.• A good match-up methodology is crucial.• Tests consistency of:

RT Model

Satellite Data

Radiosonde Data

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Draft Workshop Program, Day 1Thu. March 11, 2004 14:00 Welcome, agenda, etc.

14:30 Session 1: UTLS Data sources

14:30 Presentation

15:00 Presentation

15:30 Coffee break

16:00 Presentation

16:30 Presentation

17:00 Presentation

17:30 Close

19:00 Joint dinner

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Draft Workshop Program, Day 2Fri. March 12, 2004 09:00 Session 2: Data assimilation

09:00 Presentation

09:30 Presentation

10:00 Coffee break

10:30 Presentation

11:00 Presentation

11:30 Presentation

12:00 Lunch

14:00 Session 3: Data interpretation and scientific studies

14:00 Presentation

14:30 Presentation

15:00 Presentation

15:30 Coffee break

16:00 Presentation

16:30 Presentation

17:00 Close

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Draft Workshop Program, Day 3Sat. March 13, 2004 09:00 WG work in 3 parallel sessions

WG 1

WG 2

WG 3

12:00 Lunch

13:30 Joint session, WG reports and discussion

WG 1

WG 2

WG 3

16:00 Close

Do we also have to put in a short MC Meeting? When?