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DOI	10.1175/JCLI-D-19-0193.1
	Greenhouse effect: The relative contributions of emission height and total absorption
	Dufresne J.-L.; Eymet V.; Crevoisier C.; Grandpeix J.-Y.
发表日期	2020
ISSN	0894-8755
起始页码	3827
结束页码	3844
卷号	33 期号:9
英文摘要	Since the 1970s, results from radiative transfer models unambiguously show that an increase in the carbon dioxide (CO2) concentration leads to an increase of the greenhouse effect. However, this robust result is often misunderstood and often questioned. A common argument is that the CO2 greenhouse effect is saturated (i.e., does not increase) as CO2 absorption of an entire atmospheric column, named absorptivity, is saturated. This argument is erroneous first because absorptivity by CO2 is currently not fully saturated and still increases with CO2 concentration and second because a change in emission height explains why the greenhouse effect may increase even if the absorptivity is saturated. However, these explanations are only qualitative. In this article, we first propose a way of quantifying the effects of both the emission height and absorptivity and we illustrate which one of the two dominates for a suite of simple idealized atmospheres. Then, using a line-by-line model and a representative standard atmospheric profile, we show that the increase of the greenhouse effect resulting from an increase of CO2 from its current value is primarily due (about 90%) to the change in emission height. For an increase of water vapor, the change in absorptivity plays a more important role (about 40%) but the change in emission height still has the largest contribution (about 60%). © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Carbon dioxide; Greenhouses; Radiative transfer; Atmospheric columns; Atmospheric profile; CO2 absorption; CO2 concentration; Current values; Emission height; Radiative transfer model; Relative contribution; Greenhouse effect; absorption; carbon emission; concentration (composition); greenhouse gas; height; saturation
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171328
作者单位	Laboratoire de Météorologie Dynamique, IPSL, CNRS, Sorbonne Université, École Normale Supérieure, PSL Research University, École Polytechnique, Paris, France; MesoStar, Toulouse, France
推荐引用方式 GB/T 7714	Dufresne J.-L.,Eymet V.,Crevoisier C.,et al. Greenhouse effect: The relative contributions of emission height and total absorption[J],2020,33(9).
APA	Dufresne J.-L.,Eymet V.,Crevoisier C.,&Grandpeix J.-Y..(2020).Greenhouse effect: The relative contributions of emission height and total absorption.Journal of Climate,33(9).
MLA	Dufresne J.-L.,et al."Greenhouse effect: The relative contributions of emission height and total absorption".Journal of Climate 33.9(2020).