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Understanding three-dimensional effects in polarized observations with the ground-based ADMIRARI radiometer during the CHUVA campaign

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journal contribution
posted on 24.10.2012, 09:08 by A. Battaglia, P. Saavedra, C. Simmer, C. A. Morales
[1] Measurements of down-welling microwave radiation from raining clouds performed with the Advanced Microwave Radiometer for Rain Identification (ADMIRARI) radiometer at 10.7–21–36.5 GHz during the Global Precipitation Measurement Ground Validation “Cloud processes of the main precipitation systems in Brazil: A contribution to cloud resolving modeling and to the Global Precipitation Measurement” (CHUVA) campaign held in Brazil in March 2010 represent a unique test bed for understanding three-dimensional (3D) effects in microwave radiative transfer processes. While the necessity of accounting for geometric effects is trivial given the slant observation geometry (ADMIRARI was pointing at a fixed 30° elevation angle), the polarization signal (i.e., the difference between the vertical and horizontal brightness temperatures) shows ubiquitousness of positive values both at 21.0 and 36.5 GHz in coincidence with high brightness temperatures. This signature is a genuine and unique microwave signature of radiation side leakage which cannot be explained in a 1D radiative transfer frame but necessitates the inclusion of three-dimensional scattering effects. We demonstrate these effects and interdependencies by analyzing two campaign case studies and by exploiting a sophisticated 3D radiative transfer suited for dichroic media like precipitating clouds.

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Citation

Journal of Geophysical Research D: ATMOSPHERES, 2011, 116 (9)

Version

VoR (Version of Record)

Published in

Journal of Geophysical Research D: ATMOSPHERES

Publisher

American Geophysical Union (AGU); Wiley

issn

0148-0227

Copyright date

2011

Available date

24/10/2012

Publisher version

http://onlinelibrary.wiley.com/doi/10.1029/2010JD015335/abstract

Language

en

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