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Spectral Invariant Behavior of Zenith Radiance Around Cloud Edges Simulated by Radiative Transfer : Volume 10, Issue 6 (11/06/2010)

By Chiu, J. C.

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Book Id: WPLBN0003995416
Format Type: PDF Article :
File Size: Pages 25
Reproduction Date: 2015

Title: Spectral Invariant Behavior of Zenith Radiance Around Cloud Edges Simulated by Radiative Transfer : Volume 10, Issue 6 (11/06/2010)  
Author: Chiu, J. C.
Volume: Vol. 10, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Knyazikhin, Y., Wiscombe, W. J., Marshak, A., & Chiu, J. C. (2010). Spectral Invariant Behavior of Zenith Radiance Around Cloud Edges Simulated by Radiative Transfer : Volume 10, Issue 6 (11/06/2010). Retrieved from

Description: University of Maryland Baltimore County, Baltimore, MD, USA. A previous paper discovered a surprising spectral-invariant relationship in shortwave spectrometer observations taken by the Atmospheric Radiation Measurement (ARM) program. Here, using radiative transfer simulations, we study the sensitivity of this relationship to the properties of aerosols and clouds, to the underlying surface type, and to the finite field-of-view (FOV) of the spectrometer. Overall, the relationship is mostly sensitive to cloud properties and has little sensitivity to the other factors. At visible wavelengths, the relationship primarily depends on cloud optical depth regardless of cloud thermodynamic phase and drop size. At water-absorbing wavelengths, the slope of the spectral-invariant relationship depends primarily on cloud optical depth; the intercept, by contrast, depends primarily on cloud absorption properties, suggesting a new retrieval method for cloud drop effective radius. These results suggest that the spectral-invariant relationship can be used to infer cloud properties even with insufficient or no knowledge about spectral surface albedo and aerosol properties.

Spectral invariant behavior of zenith radiance around cloud edges simulated by radiative transfer

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