GSTDTAP  > 气候变化
DOI10.1088/1748-9326/aae018
The global warming potential of near-surface emitted water vapour
Sherwood, Steven C.1; Dixit, Vishal; Salomez, Chryseis
2018-10-01
发表期刊ENVIRONMENTAL RESEARCH LETTERS
ISSN1748-9326
出版年2018
卷号13期号:10
文章类型Article
语种英语
国家Australia
英文摘要

Water vapour is the most abundant and powerful greenhouse gas in Earth's atmosphere, and is emitted by human activities. Yet the global warming potential (GWP) and radiative forcing (RF) of emitted water vapour have not been formally quantified in the literature. Here these quantities are estimated for surface emission using idealised experiments conducted with the CAM5 global atmospheric model at fixed ocean temperatures. Water is introduced in vapour form at rates matching total anthropogenic emissions (mainly from irrigation) but omitting the local evaporative cooling seen in irrigation simulations. A 100 year GWP for H2O of 10(-3) to 5 x 10(-4) is found, and an effective radiative forcing of -0.1 to 0.05 W m(-2) for the given emissions. Increases in water vapour greenhouse effect are small because additional vapour cannot reach the upper troposphere, and greenhouse-gas warming is outweighed by increases in reflectance from humidity-induced low cloud cover, leading to a near-zero or small cooling effect. Near-surface temperature decreases over land are implied even without evaporative cooling at the surface, due to cooling by low clouds and vapour-induced changes to the moist lapse rate. These results indicate that even large increases in anthropogenic water vapour emissions would have negligible warming effects on climate, but that possible negative RF may deserve more attention.


英文关键词climate change global warming water vapour radiative forcing
领域气候变化
收录类别SCI-E
WOS记录号WOS:000445933400004
WOS关键词IRRIGATION
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/33239
专题气候变化
作者单位1.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW 2052, Australia;
2.Univ New South Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW 2052, Australia
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GB/T 7714
Sherwood, Steven C.,Dixit, Vishal,Salomez, Chryseis. The global warming potential of near-surface emitted water vapour[J]. ENVIRONMENTAL RESEARCH LETTERS,2018,13(10).
APA Sherwood, Steven C.,Dixit, Vishal,&Salomez, Chryseis.(2018).The global warming potential of near-surface emitted water vapour.ENVIRONMENTAL RESEARCH LETTERS,13(10).
MLA Sherwood, Steven C.,et al."The global warming potential of near-surface emitted water vapour".ENVIRONMENTAL RESEARCH LETTERS 13.10(2018).
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