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

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Presentation transcript:

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 SW and LW unfiltered radiances tables

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 (  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)

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

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

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

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, ,000 orbital crossings of about 90 seconds each Significant amount of data for statistical analysis

FM1 scanning pattern Unfiltered shortwave radiances on 07/10/ Watts per square meter per steradian

FM4 scanning pattern Watts per square meter per steradian Unfiltered shortwave shortwave on 07/10/2003

Shortwave radiances

Longwave radiance - daytime July August

SW radiances over Greenland

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

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

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

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

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

FM4 shortwave radiances scann  VZASZARAZ forward backward

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

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

FM4 longwave radiances scann  VZASZARAZ forward backward

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

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

FM2 shortwave radiances sample numbers radiances

FM2 longwave radiances sample numbers radiances

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

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

FM4 shortwave radiances sample numbers radiances

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

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

FM4 longwave radiances sample numbers radiances

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

FM2 shortwave radiances sample numbers radiances

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

FM2 shortwave radiances sample numbers radiances

Flyover summary DOY / / / / / / / / /30 Terra FM Aqua FM FM2 scanned the Anchor Station 12 times FM4 scanned the Anchor Station 13 times

CERES/GERB