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Validation of Quasi-Invariant Ice Cloud Radiative Quantities with MODIS Satellite-Based Cloud Property RetrievalsSimilarity relations applied to ice cloud radiance calculations are theoretically analyzed and numerically validated. If t(1v) and t(1vg) are conserved where t is optical thickness, v the single-scattering albedo, and g the asymmetry factor, it is possible that substantially different phase functions may give rise to similar radiances in both conservative and non-conservative scattering cases, particularly in the case of large optical thicknesses. In addition to theoretical analysis, this study uses operational ice cloud optical thickness retrievals from the Moderate Resolution Imaging Spectroradiometer (MODIS) Level 2 Collection5 (C5) and Collection 6 (C6) cloud property products to verify radiative similarity relations. It is found that, if the MODIS C5 and C6 ice cloud optical thickness values are multiplied by their respective (1wg)factors, the resultant products referred to as the effective optical thicknesses become similar with their ratio values around unity. Furthermore, the ratios of the C5 and C6 ice cloud effective optical thicknesses display an angular variation pattern similar to that of the corresponding ice cloud phase function ratios. The MODIS C5 and C6 values of ice cloud similarity parameter, defined as [(1w)(1(exp. 1/2)wg)]12, also tend to be similar.
Document ID
20170007806
Acquisition Source
Goddard Space Flight Center
Document Type
Accepted Manuscript (Version with final changes)
Authors
Jiachen Ding (Texas A&M University System College Station, Texas, United States)
Ping Yang (Texas A&M University System College Station, Texas, United States)
George W Kattawar (Texas A&M University System College Station, Texas, United States)
Michael D King (University of Colorado Boulder Boulder, Colorado, United States)
Steven Platnick (Goddard Space Flight Center Greenbelt, Maryland, United States)
Kerry G Meyer (Goddard Space Flight Center Greenbelt, Maryland, United States)
Date Acquired
August 17, 2017
Publication Date
March 18, 2017
Publication Information
Publication: Journal of Quantitative Spectroscopy and Radiative Transfer
Publisher: Elsevier
Volume: 194
Issue Publication Date: June 1, 2017
ISSN: 0022-4073
DOI: doi:10.1016/j.jqsrt.2017.03.025
Subject Category
Geophysics
Report/Patent Number
GSFC-E-DAA-TN45776
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Radiative transfer
MODIS
Ice cloud property

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