ASICASIC33

May 16-18 2006May 16-18 2006

Broadband Breakout GroupBroadband Breakout Group

RecommendationsRecommendationsBig 3Big 3

CrosscuttingCrosscuttingEarth Radiation BudgetEarth Radiation Budget

ASICASIC33

May 16-18 2006May 16-18 2006Achieving Satellite Instrument Calibration Achieving Satellite Instrument Calibration

for Climate Changefor Climate Change

Roughly 100 attendees, mostly Roughly 100 attendees, mostly NOAA, NASA, with some NOAA, NASA, with some

international from key programs international from key programs (GCOS) or satellite calibration (GCOS) or satellite calibration

conceptsconcepts

Big 3 RecommendationsBig 3 Recommendations

• Continuous Overlapped Satellite Altimeter Sea Continuous Overlapped Satellite Altimeter Sea Level Data: key climate riskLevel Data: key climate risk

• Continuous Overlapped Broadband Earth Continuous Overlapped Broadband Earth Radiation Budget Data: key IPCC climate Radiation Budget Data: key IPCC climate feedback and forcing uncertaintyfeedback and forcing uncertainty

• Calibration Benchmark Mission: Calibration Benchmark Mission: 0.2 to 1000.2 to 100m. Spectrally resolved plus m. Spectrally resolved plus broadband. Crosscuts calibration of many broadband. Crosscuts calibration of many climate variables.climate variables.

Crosscutting RecommendationsCrosscutting Recommendations

• Calibration Standards activity unified across GEO, GCOS, Calibration Standards activity unified across GEO, GCOS, IEEE effortsIEEE efforts

• SI traceable is a goal, absolute accuracy and long term SI traceable is a goal, absolute accuracy and long term stability should both be designed into the system to assure stability should both be designed into the system to assure success. SI may not be sufficient if sampling or analysis success. SI may not be sufficient if sampling or analysis algorithms are inadequate. (e.g. perfect single surface algorithms are inadequate. (e.g. perfect single surface pyranometer) or SI standard does not meet climate rqmt.pyranometer) or SI standard does not meet climate rqmt.

• Joint Center for Satellite Intercalibration Joint Center for Satellite Intercalibration – Very useful for NOAA, Enhances connections of instrument Very useful for NOAA, Enhances connections of instrument

calibration to NIST, NASA science team climate missions calibration to NIST, NASA science team climate missions already doing this as part of science team activities.already doing this as part of science team activities.

– Maintain responsibility in climate data record science teamsMaintain responsibility in climate data record science teams

• Two additional Climate Observing Principles : independent Two additional Climate Observing Principles : independent observations and independent scientific analysis.observations and independent scientific analysis.

• Reprocessing of CDRs, including Level1b radiances to Reprocessing of CDRs, including Level1b radiances to resolve errors is fundamentalresolve errors is fundamental

Crosscutting RecommendationsCrosscutting Recommendations

• Science team involvement in climate data records must be Science team involvement in climate data records must be continual to reach climate accuracy.continual to reach climate accuracy.– Transition NASA science team approach to NOAA climate Transition NASA science team approach to NOAA climate

programs: responsibility for calibration, algorithms, and programs: responsibility for calibration, algorithms, and validation and reprocessing.validation and reprocessing.

Broadband RecommendationsBroadband Recommendations• Earth Reflected and Emitted Broadband FluxesEarth Reflected and Emitted Broadband Fluxes

– Do Earth Radiation Budget measurements on NPP (2009) to Do Earth Radiation Budget measurements on NPP (2009) to eliminate current 20% gap riskeliminate current 20% gap risk

– To meet stability requirments, improve characterization of CERES To meet stability requirments, improve characterization of CERES FM-5 (silver mirror spectral char, MAM coatings, lamps/monitors)FM-5 (silver mirror spectral char, MAM coatings, lamps/monitors)

– Pre-launch round robin calibrations (e.g. GERB, CERES radiometric Pre-launch round robin calibrations (e.g. GERB, CERES radiometric test model, CERBE?) with NISTtest model, CERBE?) with NIST

– Put past broadband radiometers on common radiometric scalePut past broadband radiometers on common radiometric scale– Global Net Earth Radiation Error Budget and define current best Global Net Earth Radiation Error Budget and define current best

consistency with ocean heat storageconsistency with ocean heat storage– Quantify accuracy of contamination/uv exposure of broadband Quantify accuracy of contamination/uv exposure of broadband

instruments. instruments. – Reprocess broadband record from 1980 to 2000 consistently on Reprocess broadband record from 1980 to 2000 consistently on

common radiometric scale and analysis algorithms.common radiometric scale and analysis algorithms.– Work with GEWEX Radiative Flux Assessment to improve use of Work with GEWEX Radiative Flux Assessment to improve use of

narrowband AVHRR/geostationary/AVHRR estimates of past narrowband AVHRR/geostationary/AVHRR estimates of past radiation budget and constrain to broadband radiometry scaleradiation budget and constrain to broadband radiometry scale

Broadband RecommendationsBroadband Recommendations

• Change SW, LW stability goal from 0.3 WmChange SW, LW stability goal from 0.3 Wm-2 -2 to 0.15 Wmto 0.15 Wm-2 -2

per decade. Purpose is to constrain climate sensitivity to per decade. Purpose is to constrain climate sensitivity to +/- 25% (I.e. 1/4 of anthropogenic forcing of 0.6 Wm+/- 25% (I.e. 1/4 of anthropogenic forcing of 0.6 Wm-2-2 per per decade). Accuracy goal remains 1 Wmdecade). Accuracy goal remains 1 Wm-2-2..

• Extend studies of deep convection and lunar viewing for Extend studies of deep convection and lunar viewing for broadband indepenent consistency/stability checks.broadband indepenent consistency/stability checks.