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

4. 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 CERES

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

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

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 0 100 219 Watts per square meter per steradian Unfiltered shortwave shortwave on 07/10/2003

10. Shortwave radiances

11. Longwave radiance - daytime July August

12. SW radiances over Greenland

13. Results for Greenland Radiance Mean FM4 [Wm -2 ]  mean [Wm -2 ]  mean %  N orbX  test SW159.10.240.151.05720.3

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 1.17 o W and 39.34 o N 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 scann  VZASZARAZ forward2192.923.774-7733-35 167- 226 backward1486.216.471-7329-33 167- 228

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 scann  VZASZARAZ forward2161.74.274-7733-35 167- 226 backward1465.85.171-7329-33 167- 228

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 sample numbers radiances

25. FM2 longwave radiances sample numbers radiances

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 sample numbers radiances

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 sample numbers radiances

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

33. FM2 shortwave radiances sample numbers radiances

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

35. FM2 shortwave radiances sample numbers radiances

36. Flyover summary DOY 165 06/14 169 06/18 170 06/19 171 06/20 172 06/21 173 06/22 174 06/23 175 06/24 181 06/30 Terra FM2 111212121 Aqua FM4 221111212 FM2 scanned the Anchor Station 12 times FM4 scanned the Anchor Station 13 times

37. CERES/GERB