GSICS Data and Products Servers Volker Gärtner (EUMETSAT) For GSICS Data Working Group

A Selection of Slides Related to ISCCP Radiance Calibration (from Bill Rossow)

Current Steps in ISCCP Calibration Procedure Geo-to-Leo Normalization using co-located and coincident full resolution radiances Leo-to-Leo Normalization using long-term statistics of the global and target distributions of clear-sky radiances over ocean and land Compare co-located and coincident Geo-to-Leo retrievals of surface and cloud properties Monitoring Radiance Statistics at sub-monthly time scale Monitoring long-term statistics of Cumulus-Cirrus and Stratus-Deep Convection amounts as well as all physical quantities retrieved

VIS Monitor PM Orbiters Current status of ISCCP VIS calibration of afternoon polar orbiters. 5

IR AM&PM Warm Anomalies Current status of ISCCP IR calibration of afternoon polar orbiters – hot end of range.

Cloud Type Variations HIGH CIRRUS CUMULUS LOW Monitoring calibration anomalies by watching “extreme” clouds – low VIS (cirrus and cumulus), cold and hot clouds. CUMULUS LOW

Cloud Type Variations HIGH CONVECTIVE CIRRUS CUMULUS STRATUS LOW Monitoring calibration anomalies by watching “extreme” clouds – high VIS (convective and stratus), cold and hot clouds. CUMULUS STRATUS LOW

IR & VIS Radiance Calibration Activities ISCCP VIS & IR record for weather satellites (1981 – current) Some issues with latest AVHRRs Global Space-based Inter-Calibration System IR for weather satellites against AIRS & IASI VIS calibration under preparation NASA activities Comparison of various VIS calibrations (direct lunar, comparisons to MODIS, MISR, SeaWifs, DCC method) NOAA results (VIS record for 1979—current)

2007-08 GEO/Terra-MODIS cross-calibrations GOES-12 MET-7 GOES-11 MTSAT MET-9

Results based on Data at: ● AVHRR Pathfinder Atmospheres Extended (PATMOS-x): cimss.ssec.wisc.edu/clavr/patmosx ● International Satellite Cloud Climatology Project (ISCCP): isccp.giss.nasa.gov ● Land Long Term Data Record (LTDR): ltdr.nascom.nasa.gov/ltdr/avhrr_calib_1.html ● Comprehensive information on NESDIS’s effort to characterize the current AVHRR calibration and the historical instrument characteristics is here: www.star.nesdis.noaa.gov/smcd/spb/fwu/solar_cal/AVHRR.html NESDIS v3 is about to be released.

ISCCP – GSICS Issues ISCCP is interested to use the GSICS results A comparison of ISCCP to GSICS calibration results is required IF GSICS are of equal or better quality ISCCP will use GSICS calibration for (re-)processing GSICS to ensure that the calibration results are unique and reproducible For reprocessing campaign in 2010 IR and VIS calibration data would be appreciated