TEMPERATURE DEPENDENCES OF MECHANISMS RESPONSIBLE FOR THE WATER VAPOR CONTINUUM
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Date
2009
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Ohio State University
Abstract
The water-vapor continuum plays an important role in the radiation balance in the Earth's atmosphere. While this absorption has been known for a long time, the physical mechanism responsible is still an open problem. We have recently calculated theoretically both the magnitude and temperature dependence for the three mechanism that have been suggested: the far-wings of allowed lines, collision-induced absorption, and water dimers, 124313 (2008).}$^,$. All three mechanisms depend quadratically on the number density of H$_2$O for the self-continuum, and on the product of the densities for the foreign-continuum. However, these three mechanisms have quite differences on the temperature as we will discuss. This analysis may provide us with a method to assess their relative importance in ambient atmospheric measurements.
Description
Q.~Ma,~R.~H.~Tipping, and~C.~Leforestier,~J.~Chem.~Phys. \textbf{128C.~Leforestier,~R.~H.~Tipping,~and~Q.~Ma, to be submitted for publication.
Author Institution: NASA/Goddard Institute for Space Studies and; Department of Applied Physics and Applied methamatics, Columbia University; 2880 Broadway, New York, NY 10025; Department of Physics and Astronomy, University of Alabama; Tuscaloosa, AL 35487; Institute Charles Gerhardt CNRS-5253, CC1501; Universite Montpellier II, 34095 Montpellier; France
Author Institution: NASA/Goddard Institute for Space Studies and; Department of Applied Physics and Applied methamatics, Columbia University; 2880 Broadway, New York, NY 10025; Department of Physics and Astronomy, University of Alabama; Tuscaloosa, AL 35487; Institute Charles Gerhardt CNRS-5253, CC1501; Universite Montpellier II, 34095 Montpellier; France