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 · Mon Jun 01 04:00:00 EDT 1992

OSTI ID:7037249

Grant, K; Grossman, A S ^[1]; Pollack, J B; Freedman, R ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. 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: EPA; NASA; 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: 7037249
• Report Number(s): UCRL-JC-110364; CONF-9206257--1; ON: DE92019376
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ALGORITHMS
ALKANES
CHALCOGENIDES
CLIMATIC CHANGE
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ENERGY TRANSFER
GREENHOUSE EFFECT
HEAT TRANSFER
HEATING
HYDROCARBONS
INFRARED RADIATION
MATHEMATICAL LOGIC
METHANE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIANT HEAT TRANSFER
RADIATIONS