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Three-dimensional Effects in Polarization Signatures as Observed from Precipitating Clouds by Low Frequency Ground-based Microwave Radiometers : Volume 6, Issue 3 (27/06/2006)

By Battaglia, A.

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Book Id: WPLBN0003981571
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Three-dimensional Effects in Polarization Signatures as Observed from Precipitating Clouds by Low Frequency Ground-based Microwave Radiometers : Volume 6, Issue 3 (27/06/2006)  
Author: Battaglia, A.
Volume: Vol. 6, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2006
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Czekala, H., Simmer, C., & Battaglia, A. (2006). Three-dimensional Effects in Polarization Signatures as Observed from Precipitating Clouds by Low Frequency Ground-based Microwave Radiometers : Volume 6, Issue 3 (27/06/2006). Retrieved from http://ebooklibrary.org/


Description
Description: Meteorological Institute, University of Bonn, Bonn, Germany. Consistent negative polarization differences (i.e. differences between the vertical and the horizontal brightness temperature) are observed when looking at precipitating systems by ground-based radiometers at slant angles. These signatures can be partially explained by one-dimensional radiative transfer computations that include oriented non-spherical raindrops. However some cases are characterized by polarization values that exceed differences expected from one-dimensional radiative transfer.

A three-dimensional fully polarized Monte Carlo model has been used to evaluate the impact of the horizontal finiteness of rain shafts with different rain rates at 10, 19, and 30 GHz. The results show that because of the reduced slant optical thickness in finite clouds, the polarization signal can strongly differ from its one-dimensional counterpart. At the higher frequencies and when the radiometer is positioned underneath the cloud, significantly higher negative values for the polarization are found which are also consistent with some observations. When the observation point is located outside of the precipitating cloud, typical polarization patterns (with troughs and peaks) as a function of the observation angle are predicted. An approximate 1-D slant path radiative transfer model is considered as well and results are compared with the full 3-D simulations to investigate whether or not three-dimensional effects can be explained by geometry effects alone. The study has strong relevance for low-frequency passive microwave polarimetric studies.


Summary
Three-dimensional effects in polarization signatures as observed from precipitating clouds by low frequency ground-based microwave radiometers

 

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