ASIC3 May 16-18 2006 Broadband Breakout Group Recommendations Big 3 Crosscutting Earth Radiation Budget

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ASIC3May 16-18 2006Broadband Breakout
GroupRecommendationsBig 3CrosscuttingEarth
Radiation Budget
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ASIC3May 16-18 2006Achieving Satellite
Instrument Calibration for Climate ChangeRoughly
100 attendees, mostly NOAA, NASA, with some
international from key programs (GCOS) or
satellite calibration concepts
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Big 3 Recommendations

• Continuous Overlapped Satellite Altimeter Sea
  Level Data key climate risk
• Continuous Overlapped Broadband Earth Radiation
  Budget Data key IPCC climate feedback and
  forcing uncertainty
• Calibration Benchmark Mission 0.2 to 100?m.
  Spectrally resolved plus broadband. Crosscuts
  calibration of many climate variables.

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Crosscutting Recommendations

• Calibration Standards activity unified across
  GEO, GCOS, IEEE efforts
• SI traceable is a goal, absolute accuracy and
  long term stability should both be designed into
  the system to assure success. SI may not be
  sufficient if sampling or analysis algorithms are
  inadequate. (e.g. perfect single surface
  pyranometer) or SI standard does not meet climate
  rqmt.
• Joint Center for Satellite Intercalibration
• Very useful for NOAA, Enhances connections of
  instrument calibration to NIST, NASA science team
  climate missions already doing this as part of
  science team activities.
• Maintain responsibility in climate data record
  science teams
• Two additional Climate Observing Principles
  independent observations and independent
  scientific analysis.
• Reprocessing of CDRs, including Level1b radiances
  to resolve errors is fundamental

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Crosscutting Recommendations

• Science team involvement in climate data records
  must be continual to reach climate accuracy.
• Transition NASA science team approach to NOAA
  climate programs responsibility for calibration,
  algorithms, and validation and reprocessing.

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Broadband Recommendations

• Earth Reflected and Emitted Broadband Fluxes
• Do Earth Radiation Budget measurements on NPP
  (2009) to eliminate current 20 gap risk
• To meet stability requirments, improve
  characterization of CERES FM-5 (silver mirror
  spectral char, MAM coatings, lamps/monitors)
• Pre-launch round robin calibrations (e.g. GERB,
  CERES radiometric test model, CERBE?) with NIST
• Put past broadband radiometers on common
  radiometric scale
• Global Net Earth Radiation Error Budget and
  define current best consistency with ocean heat
  storage
• Quantify accuracy of contamination/uv exposure of
  broadband instruments.
• Reprocess broadband record from 1980 to 2000
  consistently on common radiometric scale and
  analysis algorithms.
• Work with GEWEX Radiative Flux Assessment to
  improve use of narrowband AVHRR/geostationary/AVHR
  R estimates of past radiation budget and
  constrain to broadband radiometry scale

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Broadband Recommendations

• Change SW, LW stability goal from 0.3 Wm-2 to
  0.15 Wm-2 per decade. Purpose is to constrain
  climate sensitivity to /- 25 (I.e. 1/4 of
  anthropogenic forcing of 0.6 Wm-2 per decade).
  Accuracy goal remains 1 Wm-2.
• Extend studies of deep convection and lunar
  viewing for broadband indepenent
  consistency/stability checks.