GERB/CERES comparisons

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Presentation transcript:

GERB/CERES comparisons Lou Smith, Z. Peter Szewczyk and Pam Mlynczak 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

3 CERES Campaigns in May/June 2003 CERES Terra/Aqua Comparisons Valencia Campaign: TOA Radiances and Ground Site GERB Detector Comparisons 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Radiation data sets 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Overview During May and June 2003, CERES FM-2 on TERRA was operated in Programmed Azimuth Plane in order to measure same radiances as GERB. We show preliminary results. Analysis is still underway. Propose using Moon as Calibration Target. 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

CERES Scan Plane Rotation to Match GERB Radiance 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Limit of GERB Field of View 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Seasonal Effects 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Field of View Sizes Solid CERES Dotted GERB 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Preliminary Results for GERB/CERES Comparison 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Insolation at June Solstice 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Preliminary Results Mostly Cloudy over Ocean 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Histogram: SW, May 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Scanning of Moon by Different GERB Detectors Due to Orbit Inclination of Moon and Earth Spin Axis, The Moon will be viewed by Different Detectors over a Period of Time 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

The Moon is 6.6 GERB pixels in diameter 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Minor Problem: Moon is covered by 6.6 pixels. Best time to do Lunar Calibration is during Full Moon. 12 Full Moons per Year X 6 Pixels = 72. Would Require Minimum of 4 Years to Calibrate All 256 Detectors this Way. OK, so how about less than best? We only need Lunar Calibration at High Latitudes. 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

Cosener’s House, Abington Summary Preliminary Results of GERB/CERES Comparisons are Mixed. Software being Developed for Further Analysis. GERB/CERES Comparison Work is Ongoing. A Campaign is Needed in December for Southern Latitudes. High Latitude Detectors require a Different Approach, e.g. Lunar Calibration. 27-29 Aug. 2003 GIST-19 Cosener’s House, Abington

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