Fast Atmospheric Signature CODE (FASCODE): an update and applications in atmospheric remote sensing

James H. Chetwynd Jr.; Jinxue Wang; Gail P. Anderson

doi:10.1117/12.187599

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30 September 1994 Fast Atmospheric Signature CODE (FASCODE): an update and applications in atmospheric remote sensing

James H. Chetwynd Jr., Jinxue Wang, Gail P. Anderson

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Proceedings Volume 2266, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research; (1994) https://doi.org/10.1117/12.187599
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

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James H. Chetwynd Jr., Jinxue Wang, and Gail P. Anderson "Fast Atmospheric Signature CODE (FASCODE): an update and applications in atmospheric remote sensing", Proc. SPIE 2266, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research, (30 September 1994); https://doi.org/10.1117/12.187599

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