DOI: 10.1007/s00382-012-1287-2
Scopus记录号: 2-s2.0-84871924137
论文题名: Asymmetries in tropical rainfall and circulation patterns in idealised CO2 removal experiments
作者: Chadwick R. ; Wu P. ; Good P. ; Andrews T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-01-02 起始页码: 295
结束页码: 316
语种: 英语
英文关键词: CO2 removal
; Geoengineering
; Rainfall
; Tropical circulation
英文摘要: Atmospheric CO2 removal is currently receiving serious consideration as a supplement or even alternative to emissions reduction. However the possible consequences of such a strategy for the climate system, and particularly for regional changes to the hydrological cycle, are not well understood. Two idealised general circulation model experiments are described, where CO2 concentrations are steadily increased, then decreased along the same path. Global mean precipitation continues to increase for several decades after CO2 begins to decrease. The mean tropical circulation shows associated changes due to the constraint on the global circulation imposed by precipitation and water vapour. The patterns of precipitation and circulation change also exhibit asymmetries with regard to changes in both CO2 and global mean temperature, but while the lag in global precipitation can be ascribed to different levels of CO2 at the same temperature state, the regional changes cannot. Instead, ocean memory and heat transfer are important here. In particular the equatorial East Pacific continues to warm relative to the West Pacific during CO2 ramp-down, producing an anomalously large equatorial Pacific sea surface temperature gradient and associated rainfall anomalies. The mechanism is likely to be a lag in response to atmospheric forcing between mixed-layer water in the east Pacific and the sub-thermocline water below, due to transport through the ocean circulation. The implication of this study is that a CO2 pathway of increasing then decreasing atmospheric CO2 concentrations may lead us to climate states during CO2 decrease that have not been experienced during the increase. © 2012 Crown Copyright. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55025
Appears in Collections: 过去全球变化的重建
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作者单位: Met Office Hadley Centre, Exeter, United Kingdom
Recommended Citation:
Chadwick R.,Wu P.,Good P.,et al. Asymmetries in tropical rainfall and circulation patterns in idealised CO2 removal experiments[J]. Climate Dynamics,2013-01-01,40(2017-01-02)