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contributor authorPujol, T.
contributor authorNorth, G. R.
date accessioned2017-06-09T14:37:53Z
date available2017-06-09T14:37:53Z
date copyright2002/10/01
date issued2002
identifier issn0022-4928
identifier otherams-23185.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159718
description abstractThe effects of the nongray absorption (i.e., atmospheric opacity varying with wavelength) on the possible upper bound of the outgoing longwave radiation (OLR) emitted by a planetary atmosphere have been examined. This analysis is based on the semigray approach, which appears to be a reasonable compromise between the complexity of nongray models and the simplicity of the gray assumption (i.e., atmospheric absorption independent of wavelength). Atmospheric gases in semigray atmospheres make use of constant absorption coefficients in finite-width spectral bands. Here, such a semigray absorption is introduced in a one-dimensional (1D) radiative?convective model with a stratosphere in radiative equilibrium and a troposphere fully saturated with water vapor, which is the semigray gas. A single atmospheric window in the infrared spectrum has been assumed. In contrast to the single absolute limit of OLR found in gray atmospheres, semigray ones may also show a relative limit. This means that both finite and infinite runaway effects may arise in some semigray cases. Of particular importance is the finding of an entirely new branch of stable steady states that does not appear in gray atmospheres. This new multiple equilibrium is a consequence of the nongray absorption only. It is suspected that this new set of stable solutions has not been previously revealed in analyses of radiative?convective models since it does not appear for an atmosphere with nongray parameters similar to those for the earth's current state.
publisherAmerican Meteorological Society
titleRunaway Greenhouse Effect in a Semigray Radiative–Convective Model
typeJournal Paper
journal volume59
journal issue19
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(2002)059<2801:RGEIAS>2.0.CO;2
journal fristpage2801
journal lastpage2810
treeJournal of the Atmospheric Sciences:;2002:;Volume( 059 ):;issue: 019
contenttypeFulltext


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