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Welcome to the COST 723 Meeting! Bern, October 6-7, 2003

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. Overall Activities. Delay due to COST move to ESF

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Welcome to the COST 723 Meeting! Bern, October 6-7, 2003

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  1. Welcome to the COST 723 Meeting!Bern, October 6-7, 2003

  2. COST 723 WG1 Meeting 1, Common Session WG1 + MC Bern, October 6-7, 2003 Stefan Buehler University of Bremen sbuehler@uni-bremen.de

  3. 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 COST 723 WG1 Meeting 1

  4. Radiosonde Humidity Ozone Aircraft MOZAIC MARSCHALS Satellite AMSU Odin Envisat Champ WG1 Activities • Established contacts to data sources: • We will learn about ongoing activities in these areas in the next two days (hopefully). COST 723 WG1 Meeting 1

  5. AMSU-B Humidity Data Stefan Buehler University of Bremen

  6. Operational Microwave Humidity Data 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 COST 723 WG1 Meeting 1

  7. Figure by M. Kuvatov COST 723 WG1 Meeting 1

  8. AMSUB Channels Figure by V. Oommen-John COST 723 WG1 Meeting 1

  9. Peak altitude of Jacobians gives sounding altitude Figure by V. Oommen-John Wettest day in 2002 (July 17) Driest day in 2002 (January 5) COST 723 WG1 Meeting 1

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

  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 COST 723 WG1 Meeting 1

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

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

  14. Error Model • The 50km inhomogeneity is the dominant error source. Error model:si = C0 + s50km • C0 is small, we take 0.5K. COST 723 WG1 Meeting 1

  15. Comparison Lindenberg radiosonde humidity vs. AMSU-B on NOAA15, time period 2002. Discrepancies in the UT for very dry conditions. Figure by M. Kuvatov COST 723 WG1 Meeting 1

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

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

  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: Satellite Data RT Model Radiosonde Data COST 723 WG1 Meeting 1

  19. Draft Workshop Program, Day 1 COST 723 WG1 Meeting 1

  20. Draft Workshop Program, Day 2 COST 723 WG1 Meeting 1

  21. Draft Workshop Program, Day 3 Do we also have to put in a short MC Meeting? When? COST 723 WG1 Meeting 1

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