NOAA Environmental Technology Laboratory Gary A. Wick Observed Differences Between Infrared and Microwave Products Detailed comparisons between infrared.

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Presentation transcript:

NOAA Environmental Technology Laboratory Gary A. Wick Observed Differences Between Infrared and Microwave Products Detailed comparisons between infrared and microwave SST products show complex spatial and temporal differences.

NOAA Environmental Technology Laboratory Gary A. Wick Data Sources Infrared –AVHRR Operational NLSST - Naval Oceanographic Office Microwave –TRMM Microwave Imager (TMI) Remote Sensing Systems – Wentz and Gentemann Buoys –QC’d GTS buoys via NCEP/CDC

NOAA Environmental Technology Laboratory Gary A. Wick Potential Microwave Error Contributions 3-D look-up table considering wind speed, SST, and water vapor

NOAA Environmental Technology Laboratory Gary A. Wick Estimated Microwave Bias

NOAA Environmental Technology Laboratory Gary A. Wick Stability Impact

NOAA Environmental Technology Laboratory Gary A. Wick Potential Infrared Error Contributions 2-D look-up table considering water vapor and SST

NOAA Environmental Technology Laboratory Gary A. Wick Estimated Infrared Bias

NOAA Environmental Technology Laboratory Gary A. Wick Infrared Aerosol Error Contributions Derived from matches with TMI

NOAA Environmental Technology Laboratory Gary A. Wick Impact of Bias Corrections Bias: 0.21 K STD: 0.44 K Bias: K STD: 0.27 K

NOAA Environmental Technology Laboratory Gary A. Wick Impact on OI Analysis August 2000 No Corrections –bias: 0.08 K –rms: 0.61 K With Corrections –bias: –rms: 0.59

NOAA Environmental Technology Laboratory Gary A. Wick New Humidity and Temperature Products Produced new near-surface specific humidity and air temperature products Combination of SSM/I and AMSU Retrieval derived through regression to cruise observations

NOAA Environmental Technology Laboratory Gary A. Wick What Factors Explain the Differences Simple linear correlation analysis Quantities readily in MW products + T a /q a Leading terms q s -q a and T s -T a Applies to both TMI and MCSST Highly sensitive to choice of surface temperature

NOAA Environmental Technology Laboratory Gary A. Wick TMI Results

NOAA Environmental Technology Laboratory Gary A. Wick MCSST Results

NOAA Environmental Technology Laboratory Gary A. Wick Additional MCSST Impact

NOAA Environmental Technology Laboratory Gary A. Wick