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Proceedings Paper

Fast Atmospheric Signature CODE (FASCODE): an update and applications in atmospheric remote sensing
Author(s): James H. Chetwynd Jr.; Jinxue Wang; Gail P. Anderson
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Paper Abstract

The U.S. Air Force has long maintained an `exact' accelerated line-by-line (LBL) radiative transfer model, the Fast Atmospheric Signature CODE (FASCODE), appropriate for applications in both the laboratory and any arbitrary line-of-sight in the atmosphere. The first version was released in 1978 with optimized Voigt line shape decomposition and layering algorithms; it had a speed advantage of about 100 over existing fixed frequency LBL codes. The current version of FASCODE, FASCOD3, is fully compatible with the HITRAN92 database, including access to the temperature-dependent cross sections for heavy molecules (e.g., chloro-fluorocarbons/CFCs, etc.). Some new features of FASCOD3 are: line coupling algorithms for both 15 micron CO2 and the mm lines of O2; non-local thermodynamic equilibrium models; updated H2O continuum; multiple scattering capability; and laser options for lidar modeling applications. Because of its speed over other LBL codes and extensive validations against measurements, FASCOD3 is increasingly being used as a high resolution remote sensing data analysis tool from microwave and infrared (IR) to ultraviolet (UV) spectral ranges.

Paper Details

Date Published: 30 September 1994
PDF: 11 pages
Proc. SPIE 2266, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research, (30 September 1994); doi: 10.1117/12.187599
Show Author Affiliations
James H. Chetwynd Jr., Air Force Phillips Lab. (United States)
Jinxue Wang, Air Force Phillips Lab. (United States)
Gail P. Anderson, Air Force Phillips Lab. (United States)

Published in SPIE Proceedings Vol. 2266:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research
Jinxue Wang; Paul B. Hays, Editor(s)

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