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A strong ice cloud event as seen by a microwave satellite sensor: Simulations and Observations

Sreerekha, T.R. and Buehler, Stefan A. and O'Keeffe, Una and Doherty, Amy and Emde, Claudia and John, Viju O. (2008) A strong ice cloud event as seen by a microwave satellite sensor: Simulations and Observations. Journal of Quantitative Spectroscopy and Radiative Transfer, 109, pp. 1705-1718. DOI: 10.1016/j.jqsrt.2007.12.023.

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Official URL: http://www.elsevier.com/wps/find/journaldescription.cws_home/272/description#description

Abstract

In this article, brightness temperatures observed by channels of the Advanced Microwave Sounding Unit-B (AMSU-B) instrument are compared to those simulated by a radiative transfer model, which can take into account the multiple scattering due to ice particles by using a discrete ordinate iterative solution method. The input fields, namely, the pressure, temperature, humidity, and cloud water content are taken from the short range forecast from the Met Office mesoscale model (UKMES). The comparison was made for a case study on the 25 January 2002 when a frontal system associated with significant cloud was present over the UK. It is demonstrated that liquid clouds have maximum impact on channel 16 of AMSU whereas ice clouds have maximum impact on channel 20. The main uncertainty for simulating microwave radiances is the assumptions about microphysical properties, such as size distribution, shape and orientation of the cloud particles, which are not known in the mesoscale model. The article examines the impact of these parameters on the cloud signal. The polarisation signal due to oriented ice particles at these frequencies is also discussed.

Document Type:Article
Title:A strong ice cloud event as seen by a microwave satellite sensor: Simulations and Observations
Authors:
AuthorsInstitution or Email of Authors
Sreerekha, T.R.The Met Office, UK
Buehler, Stefan A.Lulea Univ. of Technology, S
O'Keeffe, UnaThe Met Office, UK
Doherty, AmyThe Met Office, UK
Emde, ClaudiaUNSPECIFIED
John, Viju O.Univ. of Miami, FL, USA
Date:2008
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Volume:109
DOI:10.1016/j.jqsrt.2007.12.023
Page Range:pp. 1705-1718
Status:Published
Keywords:Clouds; Scattering; Microwave Radiative transfer; Polarisation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Claudia Emde
Deposited On:04 Dec 2008
Last Modified:12 Dec 2013 20:34

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