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

Bern, COST 723 WG1 Meeting 1Stefan Buehler 3 Overall Activities Delay due to COST move to ESF Web site and mailing lists at 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, COST 723 WG1 Meeting 1Stefan Buehler 4 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, COST 723 WG1 Meeting 1Stefan Buehler 6 Platform InstrumentLaunch DMSP F-13SSM-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, COST 723 WG1 Meeting 1Stefan Buehler 7 Figure by M. Kuvatov

Bern, COST 723 WG1 Meeting 1Stefan Buehler 8 AMSUBChannelsAMSUBChannels Figure by V. Oommen-John

Bern, COST 723 WG1 Meeting 1Stefan Buehler 9 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, COST 723 WG1 Meeting 1Stefan Buehler 10 Wettest day in 2002 (July 17) Driest day in 2002 (January 5) Lindenberg Radiosonde Data Solid: RH, dashed T, dotted RH_icesat Figure by M. Kuvatov

Bern, COST 723 WG1 Meeting 1Stefan Buehler 11 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, COST 723 WG1 Meeting 1Stefan Buehler 12 Solution: Look at a target area, we take a 50km circle. Striking: Atmospheric inhomogeneity can be a problem. Figure by M. Kuvatov

Bern, COST 723 WG1 Meeting 1Stefan Buehler 13 Number of Occurrences Standard deviation of brightness temperatures inside the target area. Vertical lines are from operational calibration. Figure by V. Oommen-John

Bern, COST 723 WG1 Meeting 1Stefan Buehler 14 Error Model The 50km inhomogeneity is the dominant error source. Error model:  i = C 0 +  50km C 0 is small, we take 0.5K.

Bern, COST 723 WG1 Meeting 1Stefan Buehler 15 Comparison Lindenberg radiosonde humidity vs. AMSU- B on NOAA15, time period Discrepancies in the UT for very dry conditions. Figure by M. Kuvatov

Bern, COST 723 WG1 Meeting 1Stefan Buehler 16 Radiosonde Stations in COST 723 Countries (from Met Office Archive) Figure by V. Oommen-John

Bern, COST 723 WG1 Meeting 1Stefan Buehler 17 Satellite Data as a Tool to Compare Different Stations Lindenberg / Germany (Vaisala RS80) Kem / Russia (Goldbeater skin) Figure by V. Oommen-John

Bern, COST 723 WG1 Meeting 1Stefan Buehler 18 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

Bern, COST 723 WG1 Meeting 1Stefan Buehler 19 Draft Workshop Program, Day 1 Thu. March 11, :00Welcome, agenda, etc. 14:30Session 1: UTLS Data sources 14:30Presentation 15:00Presentation 15:30Coffee break 16:00Presentation 16:30Presentation 17:00Presentation 17:30Close 19:00Joint dinner

Bern, COST 723 WG1 Meeting 1Stefan Buehler 20 Draft Workshop Program, Day 2 Fri. March 12, :00Session 2: Data assimilation 09:00Presentation 09:30Presentation 10:00Coffee break 10:30Presentation 11:00Presentation 11:30Presentation 12:00Lunch 14:00Session 3: Data interpretation and scientific studies 14:00Presentation 14:30Presentation 15:00Presentation 15:30Coffee break 16:00Presentation 16:30Presentation 17:00Close

Bern, COST 723 WG1 Meeting 1Stefan Buehler 21 Draft Workshop Program, Day 3 Sat. March 13, :00WG work in 3 parallel sessions WG 1 WG 2 WG 3 12:00Lunch 13:30Joint session, WG reports and discussion WG 1 WG 2 WG 3 16:00Close Do we also have to put in a short MC Meeting? When?