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CERES GEO Temporal Interpolation


GEO Temporal Interpolation Description

  • 3-hourly geostationary clouds and fluxes are used to estimate the flux in between CERES measurements to take into account changing meteorology
  • GEO clear-sky and snow region derived fluxes are excluded from interpolation
  • The CERES instrument onboard Terra (10:30LT) or Aqua (13:30LT) are in sun-synchronous orbits limiting diurnal sampling
  • Differences between CERES/GEO and CERES-only temporal interpolation are explained for SW and LW.

GEO Clouds and Fluxes Procedure

  • 5-satellite GEO 3-hourly pixel 8-km pixel radiances between 60°N and 60°S are calibrated against Terra-MODIS, which is well calibrated
  • GEO cloud properties are retrieved using a subset of the MODIS cloud retrieval code using only the visible and 11µm channel providing consistency between MODIS and GEO clouds
  • The GEO broadband radiance are estimated from narrowband to broadband relationships using coincident MODIS/GEO measurements using the CERES ADM scene types
  • GEO broadband radiances are converted to flux using CERES ADM
  • GEO derived fluxes are regionally constrained to CERES flux observations, even if the GEO calibration is artificially adjusted by ±5% and the process is repeated, the global monthly flux bias is ~0.1 W/m2 and the regional RMS error <1 W/m2
  • GEO fluxes maintain CERES calibration, free of GEO artifacts
  • Further validation is provided in the SYN Data Quality Summary (DQS) link to external site

CERES Data Product Information

 
 
 
Page Curator: Elizabeth Heckert
NASA Official: Dr. Norman Loeb
Page Last Modified: 11/24/2014 15:20
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