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Improvements in the Level-3 Oceanic Rainfall Algorithm Thomas Wilheit

Improvements in the Level-3 Oceanic Rainfall Algorithm Thomas Wilheit Department of Atmospheric Science Texas A&M University College Station, TX; USA. Two Pass Level 3 Oceanic Rainfall Algorithm. TRMM Precipitation Radar Data for 1998 Profiles expressed as Surface Rain Rate & Slope

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Improvements in the Level-3 Oceanic Rainfall Algorithm Thomas Wilheit

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  1. Improvements in the Level-3 Oceanic Rainfall Algorithm Thomas Wilheit Department of Atmospheric Science Texas A&M University College Station, TX; USA

  2. Two Pass Level 3 Oceanic Rainfall Algorithm

  3. TRMM Precipitation Radar Data for 1998 Profiles expressed as Surface Rain Rate & Slope Surface Rain Is Desired Quantity but Column Mean is Closer to What the Radiometer Measures Two Ways of Computing TBs Compute TBs at Radar Resolution and Smooth to Radiometer Res Approximates Actual Measurement Smooth Rain Field to Radiometer Resolution Then Compute TBs Implicit in Interpretation Don’t Know Structure in General Case The Difference is the Beam Filling Error Vertical Profile Error Remains Can Only Be Corrected in a Statistical Sense

  4. How can we make sense of this mess? Expand Tb(RR) around <RR> (mean RR over FOV) To a Very Good Approximation: , and A are Functions of Freq., Pol. and Freezing Level Thus, Can be Expressed as over FOV

  5. Conclusions Combined TMI/AMSRE Product Reduces Random Error Improved description of Offset Uncertainty Reduces Net Uncertainty in Most Locations Improved Drop Size Distribution Slight Reduction of Uncertainty but firmer basis Improved Beam Filling Correction In Progress/Paper Submitted to JMSJ

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