Abstract

Microwave path-average measurements of rainfall attenuation at 25.35 GHz (A/sub 25H/), 38.025 GHz (A/sub 38H/), using the upgraded 2.3-km NASA TRMM microwave link, are used to estimate parameters (/spl Lambda/ and N/sub 0/-/spl mu/ fixed) of a path-average gamma drop size distribution N~(D). This dual-wavelength technique requires the computation of the forward scattering amplitude f(D) for oblate raindrops to solve for the drop size distribution parameters numerically. The resulting N~(D) is then used to compute the corresponding instantaneous rain rate, R~, which is compared to rainfall rate estimates based on empirical power law relations, and to path-average rainfall rate measurements from a network of optical and tipping bucket raingauges located beneath the link path. Rain rate estimates using link path-average polarization differential phase-shift measurements (/spl Phi//sub DP/) at 8.45 GHz are also implemented.

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