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Understanding the polarization signal of spherical particles for microwave limb radiances

Teichmann, Claas and Buehler, Stefan Alexander and Emde, Claudia (2006) Understanding the polarization signal of spherical particles for microwave limb radiances. Journal of Quantitative Spectroscopy and Radiative Transfer, 101 (1), pp. 179-190. DOI: 10.1016/j.jqsrt.2006.03.001.

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Abstract

This paper presents a simple conceptual model to explain that even spherical scatterers lead to a polarization difference signal for microwave limb radiances. The conceptual model relates the polarization difference measured by a limb-looking sensor situated inside a cloud with the anisotropy of the radiation. In the simulations, it was assumed that the cloud consists of spherical ice particles with a radius of which were situated between 10.6 and 12.3 km altitude. The frequencies 318 and 500 GHz were considered. The results of the conceptual model were compared to the results of the fully polarized scattering model ARTS-1-1. The comparison showed a good qualitative agreement. The polarization difference decreases inside the cloud with increasing height and changes sign. This behavior can be related to a different amount of radiation coming from the atmosphere above and below the cloud, compared to the amount of radiation coming from the sides. The sign of polarization difference of the scattered radiation is opposite for these two radiation sources.

Document Type:Article
Title:Understanding the polarization signal of spherical particles for microwave limb radiances
Authors:
AuthorsInstitution or Email of Authors
Teichmann, ClaasUniv. Bremen, Bremen
Buehler, Stefan AlexanderUniv. Bremen, Bremen
Emde, ClaudiaUNSPECIFIED
Date:2006
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:101
DOI:10.1016/j.jqsrt.2006.03.001
Page Range:pp. 179-190
Status:Published
Keywords:Radiative transfer, Microwave remote sensing, Scattering, Cirrus clouds, Limb observations, Polarization
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Claudia Emde
Deposited On:16 Feb 2007
Last Modified:11 Nov 2014 21:56

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