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

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

4. 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

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

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

7. 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

8. 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

9. 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)

10. 2007-08 GEO/Terra-MODIS cross-calibrations
GOES-12
MET-7
GOES-11
MTSAT
MET-9

11. 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:
NESDIS v3 is about to be released.

12. 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