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IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, 6 (2), 354-358, 2009
Rain observations by a multi-frequency dual polarized radiometer.
A. Battaglia, P. Saavedra, C. Simmer, and T. Rose
Abstract
During the Convective and Orographically Induced
Precipitation Study, advanced microwave radiometer for rain
identification has continuously acquired measurements at the Atmospheric
Radiation Measurement Mobile Facility in the Black
Forest from the beginning of August until December 2007. The
radiometer has six channels measuring in horizontal and vertical
polarizations at 10.65, 21.0, and 36.5 GHz. Rainy events have been
selected out of the entire database according to collocated gauges
and, subsequently, analyzed. Measured brightness temperatures
and (vertical–horizontal) polarization differences are interpreted
by comparing with radiative transfer simulations, which account
for the presence of nonspherical particles in preferential orientation.
Measurements confirm the importance of the polarization
signal for separating the effect introduced by non-Rayleigh
scatterers and, therefore, the rain from the cloud component.
More quantitative interpretation of the signal requires a better
understanding of the role played by melting particles and an
identification of the 3-D structure of the precipitating system
under observation. Both aspects will be tackled in the near future
by exploiting the synergy with a coinstalled micro rain radar.
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