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DOI | 10.1088/1748-9326/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
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ISSN | 1748-9326 |
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 |
推荐引用方式 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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