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Simulations of Infrared Radiances Over a Deep Convective Cloud System Observed During TC4: Potential for Enhancing Nocturnal Ice Cloud Retrievals
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External Online Source: doi:10.3390/rs4103022
Author and Affiliation:
Minnis, Patrick(NASA Langley Research Center, Hampton, VA, United States);
Hong, Gang(Science Systems and Applications, Inc., Hampton, VA, United States);
Ayers, Kirk(Science Systems and Applications, Inc., Hampton, VA, United States);
Smith, William L., Jr.(NASA Langley Research Center, Hampton, VA, United States);
Yost, Christopher R.(Science Systems and Applications, Inc., Hampton, VA, United States);
Heymsfield, Andrew J.(National Center for Atmospheric Research, Earth System Lab., Boulder, CO, United States);
Heymsfield, Gerald M.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Hlavka, Dennis L.(Science Systems and Applications, Inc., Lanham, MD, United States);
King, Michael D.(Colorado Univ., Boulder, CO, United States);
Korn, Errol(National Center for Atmospheric Research, Boulder, CO, United States);
McGill, Matthew(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Selkirk, Henry B.(Universities Space Research Association, Columbia, MD, United States);
Thompson, Anne M.(Pennsylvania State Univ., Dept. of Meteorology, State College, PA, United States);
Tian, Lin(Morgan State Univ., Baltimore, MD, United States);
Yang, Ping(Texas A&M Univ., Dept. of Atmospheric Sciences, College Station, TX, United States)
Abstract: Retrievals of ice cloud properties using infrared measurements at 3.7, 6.7, 7.3, 8.5, 10.8, and 12.0 microns can provide consistent results regardless of solar illumination, but are limited to cloud optical thicknesses tau < approx.6. This paper investigates the variations in radiances at these wavelengths over a deep convective cloud system for their potential to extend retrievals of tau and ice particle size D(sub e) to optically thick clouds. Measurements from the Moderate Resolution Imaging Spectroradiometer Airborne Simulator--ASTER, the Scanning High-resolution Interferometer Sounder, the Cloud Physics Lidar (CPL), and the Cloud Radar System (CRS) aboard the NASA ER-2 aircraft during the NASA TC4 (Tropical Composition, Cloud and Climate Coupling) experiment flight during 5 August 2007, are used to examine the retrieval capabilities of infrared radiances over optically thick ice clouds. Simulations based on coincident in-situ measurements and combined cloud tau from CRS and CPL measurements are comparable to the observations. They reveal that brightness temperatures at these bands and their differences (BTD) are sensitive to tau up to approx.20 and that for ice clouds having tau > 20, the 3.7 - 10.8 microns and 3.7 - 6.7 microns BTDs are the most sensitive to D(sub e). Satellite imagery appears consistent with these results. Keywords: clouds; optical depth; particle size; satellite; TC4; multispectral thermal infrared
Publication Date: Oct 11, 2012
Document ID:
20130008730
(Acquired Feb 01, 2013)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: NF1676L-14281, NF1676L-14985
Document Type: Preprint
Publication Information: Remote Sensing (ISSN 2072-4292); Volume 4; 3022-3054
Contract/Grant/Task Num: WBS 281945.02.04.01.75
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 31p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: BRIGHTNESS TEMPERATURE; CLIMATE; CLOUD PHYSICS; CONVECTION; DATA RETRIEVAL; ICE CLOUDS; IN SITU MEASUREMENT; MODIS (RADIOMETRY); OPTICAL RADAR; OPTICAL THICKNESS; SATELLITE IMAGERY; TROPICAL REGIONS
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