A correlated K-distribution model of the heating rates for CH{sub 4} and N{sub 2}O in the atmosphere between 0 and 60 km
Conference
·
OSTI ID:10170177
- Lawrence Livermore National Lab., CA (United States)
- National Aeronautics and Space Administration, Moffett Field, CA (United States). Ames Research Center
An infrared radiative transfer model using the correlated-k technique is being developed for use in atmospheric chemistry and climate models at LLNL, as well as for stand-alone radiative diagnostics. This implementation of the correlated-k algorithm will provide a computationally efficient means to calculate atmospheric radiative fluxes and heating rates. It will also allow for both time-varying gas concentrations and for the rapid inclusion of new gases into the model. We present both a general background of the c-k method and the results of applying our prototype model to absorption by CH{sub 4} and N{sub 2}0 in the 7--9 micron wavelength band. The correlated-k algorithm maps the highly structured absorption coefficient versus wavelength relationship into a substantially smoother monotonic relationship between the absorption coefficient and its cumulative probability distribution. This provides a substantial reduction in computational complexity, relative to line-byline calculations, while maintaining a high degree of accuracy
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- Environmental Protection Agency, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10170177
- Report Number(s):
- UCRL-JC--110364; CONF-9206257--1; ON: DE92019376
- Country of Publication:
- United States
- Language:
- English
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