气候变化领域集成服务门户(CCPortal): Linearity of Outgoing Longwave Radiation: From an Atmospheric Column to Global Climate Models

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DOI	10.1029/2020GL089235
	Linearity of Outgoing Longwave Radiation: From an Atmospheric Column to Global Climate Models
	Zhang Y.; Jeevanjee N.; Fueglistaler S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:17
英文摘要	The linearity of global-mean outgoing longwave radiation (OLR) with surface temperature is a basic assumption in climate dynamics. This linearity manifests in global climate models, which robustly produce a global-mean longwave clear-sky (LWCS) feedback of 1.9 W/m2/K, consistent with idealized single-column models (Koll & Cronin, 2018, https//:doi.org/10.1073/pnas.1809868115). However, there is considerable spatial variability in the LWCS feedback, including negative values over tropical oceans (known as the “super-greenhouse effect”) which are compensated for by larger values in the subtropics/extratropics. Therefore, it is unclear how the idealized single-column results are relevant for the global-mean LWCS feedback in comprehensive climate models. Here we show with a simple analytical theory and model output that the compensation of this spatial variability to produce a robust global-mean feedback can be explained by two facts: (1) When conditioned upon free-tropospheric column relative humidity (RH), the LWCS feedback is independent of RH, and (2) the global histogram of free-tropospheric column RH is largely invariant under warming. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric humidity; Greenhouse effect; Tropics; Troposphere; Analytical theory; Atmospheric columns; Global climate model; Outgoing longwave radiation; Single-column model; Spatial variability; Surface temperatures; Tropospheric columns; Climate models; climate modeling; climate variation; global climate; longwave radiation; relative humidity; spatial variation; troposphere
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169770
作者单位	Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Department of Geosciences, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Zhang Y.,Jeevanjee N.,Fueglistaler S.. Linearity of Outgoing Longwave Radiation: From an Atmospheric Column to Global Climate Models[J],2020,47(17).
APA	Zhang Y.,Jeevanjee N.,&Fueglistaler S..(2020).Linearity of Outgoing Longwave Radiation: From an Atmospheric Column to Global Climate Models.Geophysical Research Letters,47(17).
MLA	Zhang Y.,et al."Linearity of Outgoing Longwave Radiation: From an Atmospheric Column to Global Climate Models".Geophysical Research Letters 47.17(2020).