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CERES on Terra & Aqua validation and participation in SCALES

CERES on Terra & Aqua validation and participation in SCALES. Z. Peter Szewczyk G. Louis Smith. The GIST 19, RAL 08/27-29, 2003. Presentation Outline. Highlights of validation of CERES on Terra and Aqua PAPS mode of a CERES instrument Scanning over the Valencia Anchor Station

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CERES on Terra & Aqua validation and participation in SCALES

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  1. CERES on Terra & Aqua validation and participation in SCALES Z. Peter Szewczyk G. Louis Smith The GIST 19, RAL 08/27-29, 2003

  2. Presentation Outline • Highlights of validation of CERES on Terra and Aqua • PAPS mode of a CERES instrument • Scanning over the Valencia Anchor Station • SW and LW unfiltered radiances tables

  3. CERES Clouds and the Earth’s Radiant Energy System Instrument • Narrow field-of-view (15x30km at nadir) scanning radiometer: • Shortwave channel (0.3-5mm), • Total channel (0.3-100mm), • Window channel (8-12mm) • FM1 & FM2 on board Terra (in service from 03/2000) • FM3 & FM4 on board Aqua (in service from 06/2002)

  4. CERES CERES • Calibration stability monitored with: • On-board calibration sources (blackbodies, lamps, solar) • Multi-channel and multi-instrument consistency • Geophysical validation • Gain drifts can be detected at the 0.1% level, and corrected! • A part of validated data set for the radiation budget since 1984

  5. FM1 scan over Greenland Unfiltered shortwave radiances at 13:40 on 07/10/2003 0 100 203 Watts per square meter per steradian

  6. FM4 scan over Greenland Unfiltered shortwave radiances at 13:54 on 07/10/2003 0 100 200 Watts per square meter per steradian

  7. Why Greenland? • Observation site which is the most homogenous: • FM1 and FM4 15 minutes apart • Scans orthogonal to the solar plane • Scanning in every orbit for different scene types • Validation campaign: • 07/04 – 08/22, 2002 • 1,000 orbital crossings of about 90 seconds each • Significant amount of data for statistical analysis

  8. FM1 scanning pattern Unfiltered shortwave radiances on 07/10/2003 0 100 217 Watts per square meter per steradian

  9. FM4 scanning pattern Unfiltered shortwave shortwave on 07/10/2003 0 100 219 Watts per square meter per steradian

  10. Shortwave radiances

  11. July August Longwave radiance - daytime

  12. SW radiances over Greenland

  13. Results for Greenland

  14. Conclusions • Validation procedure for FM1 and FM4 was shown to be well planned and executed • Data analysis fully demonstrated the 1% consistency in radiance measurements • Experiment was repeated in June, 2003 in an effort to further monitor CERES performance • CERES instruments have delivered a high quality radiation budget data set since 1998

  15. PAPS for SCALES • CERES in Programmable Azimuth Plane Scan: • Scanning Plane follows a prescribed schedule • Valencia Anchor Station at 1.17oW and 39.34oN • Increases sampling by an order of magnitude • FM2 on Terra and FM4 on Aqua • 06/14, 06/18-24, and 06/30

  16. FM4 scanning pattern Aqua pass at 14:12–14:18 on 06/14/2003; view from 2000km Shortwave radiance

  17. FM4 scanning pattern Aqua pass at 14:13–14:17 on 06/14/2003; view from 100km Shortwave radiance

  18. FM4 shortwave radiances

  19. FM4 scanning pattern Aqua pass at 14:12–14:18 on 06/14/2003; view from 2000km Longwave radiance

  20. FM4 scanning pattern Aqua pass at 14:13–14:17 on 06/14/2003; view from 100km Longwave radiance

  21. FM4 longwave radiances

  22. FM2 scanning pattern Terra pass at 10:56–11:03 on 06/14/2003; view from 2000km Shortwave radiance

  23. FM2 scanning pattern Terra pass at 10:56–11:03 on 06/14/2003; view from 100km Shortwave radiance

  24. FM2 shortwave radiances radiances sample numbers

  25. FM2 longwave radiances radiances sample numbers

  26. FM4 scanning pattern Aqua pass at 12:39–12:47 on 06/21/2003; view from 2000km Shortwave radiance

  27. FM4 scanning pattern Aqua pass at 12:39–12:47 on 06/21/2003; view from 100km Shortwave radiance

  28. FM4 shortwave radiances radiances sample numbers

  29. FM4 scanning pattern Aqua pass at 12:39–12:47 on 06/21/2003; view from 2000km Longwave radiance

  30. FM4 scanning pattern Aqua pass at 12:39–12:47 on 06/21/2003; view from 100km Longwave radiance

  31. FM4 longwave radiances radiances sample numbers

  32. FM2 scanning pattern Terra pass at 11:00–11:11 on 06/21/2003; view from 2000km Shortwave radiance

  33. FM2 shortwave radiances radiances sample numbers

  34. FM2 scanning pattern Terra pass at 11:00–11:11 on 06/21/2003; view from 2000km Longwave radiance

  35. FM2 shortwave radiances radiances sample numbers

  36. Flyover summary • FM2 scanned the Anchor Station 12 times • FM4 scanned the Anchor Station 13 times

  37. CERES/GERB

  38. CERES/GERB

  39. CERES/GERB

  40. CERES/GERB

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