气候变化领域集成服务门户(CCPortal): The Spectral Nature of Stratospheric Temperature Adjustment and its Application to Halocarbon Radiative Forcing

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DOI	10.1029/2019MS001951
	The Spectral Nature of Stratospheric Temperature Adjustment and its Application to Halocarbon Radiative Forcing
	Shine K.P.; Myhre G.
发表日期	2020
ISSN	19422466
卷号	12 期号:3
英文摘要	Stratospheric temperature adjustment (STA) is often a significant component of greenhouse gas radiative forcing (RF), for both the most widely used definition of RF and effective radiative forcing. It is well established that the magnitude and sign of STA differs among greenhouse gases, being negative (at the tropopause) for CO2 increases (because it induces a cooling of the stratosphere) and positive for many halocarbons (because they induce a warming of the stratosphere); this effect is strongly related to the opacity (and hence the effective emitting temperature) of the troposphere at the wavelengths at which gases absorb. Here the spectral variation of STA is examined for the first time by systematically imposing a weak absorber in each of 300 bands of a narrow-band radiation code. For this weak absorber, STA is negative for wavelengths greater than about 13 μm and positive in the 8- to 13-μm “window” except in the vicinity of the 9.6-μm ozone band. By combining narrow-band and line-by-line model results, these findings are used to improve a widely used fast method to estimate radiative efficiency (RE, the RF per unit change in concentration) directly from laboratory measurements or theoretical calculations of halocarbon absorption cross sections; the new method reproduces detailed RE calculations to better than 1.4%. This is a significant improvement over a cruder method used to account for STA in RE tabulations in the Intergovernmental Panel on Climate Change's Fifth Assessment Report, which were used to calculate metrics such as the Global Warming Potential, for halocarbons and related substances. © 2020. The Authors.
英文关键词	greenhouse gases; halocarbons; radiative forcing
语种	英语
scopus关键词	Atmospheric radiation; Global warming; Greenhouse effect; Greenhouse gases; Absorption cross sections; Global warming potential; Intergovernmental panel on climate changes; Laboratory measurements; Narrow-band radiation; Radiative efficiency; Stratospheric temperature; Theoretical calculations; Halocarbons; absorption; air temperature; cooling; greenhouse gas; halocarbon; measurement method; ozone; radiative forcing; stratosphere; troposphere; wavelength
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156747
作者单位	Department of Meteorology, University of Reading, Reading, United Kingdom; CICERO, Oslo, Norway
推荐引用方式 GB/T 7714	Shine K.P.,Myhre G.. The Spectral Nature of Stratospheric Temperature Adjustment and its Application to Halocarbon Radiative Forcing[J],2020,12(3).
APA	Shine K.P.,&Myhre G..(2020).The Spectral Nature of Stratospheric Temperature Adjustment and its Application to Halocarbon Radiative Forcing.Journal of Advances in Modeling Earth Systems,12(3).
MLA	Shine K.P.,et al."The Spectral Nature of Stratospheric Temperature Adjustment and its Application to Halocarbon Radiative Forcing".Journal of Advances in Modeling Earth Systems 12.3(2020).