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Determination of three-dimensional cloud structures from high-resolution radiance data

Zinner, Tobias and Mayer, Bernhard and Schröder, Marc (2006) Determination of three-dimensional cloud structures from high-resolution radiance data. Journal of Geophysical Research, 111, D08204. DOI: 10.1029/2005JD006062.

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Official URL: http://www.agu.org/journals/jd/

Abstract

The three-dimensional structure and the inhomogeneity of clouds poses a field of challenges. The characterization of their spatial structure, their microphysical properties, and their variability is difficult. On the other hand this kind of knowledge is crucial to any investigation on the impact of clouds on the radiation budget or on the reliability of cloud remote sensing data. In this article the characteristics of horizontal transport of radiation in inhomogeneous clouds are studied using three-dimensional (3D) simulations of radiative transport and the independent pixel approximation (IPA). The opposing 3D effects of radiative smoothing and sharpening due to horizontal photon transport are examined in terms of the Green’s function which describes the interrelation of the radiance fields calculated using IPA and 3D radiative transport. Based on these considerations a novel method was developed allowing the determination of realistic 3D stratocumulus structures from high spatial resolution radiance fields observed by a compact airborne spectrographic imager (CASI, 15 m resolution). An initial 3D distribution of liquid water content and effective droplet size retrieved using the IPA assumption and an adiabatic microphysical model is adjusted with the objective to reproduce the observation by a 3D forward radiative transfer simulation. Therefor an approximate Green’s function is utilized in an iterative routine to remove 3D effects from the observation. A set of 27 stratocumulus cloud structures is provided for subsequent investigations. The capability of the method is characterized through a test case and the comparison of average cloud properties to in-situ data of various field campaigns.

Document Type:Article
Title:Determination of three-dimensional cloud structures from high-resolution radiance data
Authors:
AuthorsInstitution or Email of Authors
Zinner, TobiasUNSPECIFIED
Mayer, BernhardUNSPECIFIED
Schröder, MarcInstitut für Weltraumwissenschaften, Freie Universität Berlin
Date:April 2006
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:111
DOI:10.1029/2005JD006062
Page Range:D08204
Status:Published
Keywords:clouds, remote sensing, 3D radiative transport
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt Partikel und Zirren II (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Tobias Zinner
Deposited On:02 May 2006
Last Modified:11 Nov 2014 21:56

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