Rain wind backscatter model
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Rain/Wind Backscatter Model. Rain affects ~4% of SeaWinds data. Model for measured backscatter Radar signal scattered by falling droplets Surface signal attenuated by atmospheric rain Surface wind-induced backscatter perturbed by rain striking the water

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Rain wind backscatter model
Rain/Wind Backscatter Model

Rain affects ~4% of SeaWinds data

  • Model for measured backscatter

  • Radar signal scattered by falling droplets

  • Surface signal attenuated by atmospheric rain

  • Surface wind-induced backscatter perturbed by rain striking the water

  • Model derived from colocated TRMM PR and QuikSCAT data



Wind rain regimes
Wind Rain Regimes

  • incorporates surface rain perturbation, atmospheric rain scattering, and attenuation

    - Empirical function of rain rate derived from collocated QuikSCAT and TRMM PR

  • Regime 1: rain dominates wind backscatter – poor quality wind estimates (10% of rain cases*)

  • Regime 2: both wind and rain important – can retrieve wind and rain rate (34% of rain cases*)

  • Regime 3: rain effects insignificant – wind estimates unaffected by rain (56% of rain cases*)

  • Note: globally, only about 4% of all QuikSCAT data effected by rain

* From collocated TRMM PR and QuikSCAT data in tropics



Scatterometer rain retrieval validation
Scatterometer Rain Retrieval Validation

Bias can be estimated and corrected for


Rain estimate validation
Rain Estimate Validation

  • QuikSCAT-derived rain rates vs TMI-derived rain rates