Abstract
The standard rain rate retrieval algorithm for TRMM/PR applies hybrid method with surface reference technique (SRT) and HitschfeldBordan method. Path integrated attenuation (PIA) estimated by the SRT of the standard algorihtm is sometimes negatively biased because surface backscattering cross section increases during rainfall. This is called “soil moisture effect” in this paper and it is not explicitly considered in the SRT of the standard algorithm. Temporal reference method does not follow this effect at all and spatial reference method partly follows this effect, but fails in some area such as the Sahel. The negative bias in PIA leads to the negative bias in the rain rate estimates especially for heavy rain.
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