气候变化领域集成服务门户(CCPortal): Low Antarctic continental climate sensitivity due to high ice sheet orography

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DOI	10.1038/s41612-020-00143-w
	Low Antarctic continental climate sensitivity due to high ice sheet orography
	Singh H.A.; Polvani L.M.
发表日期	2020
ISSN	23973722
卷号	3 期号:1
英文摘要	The Antarctic continent has not warmed in the last seven decades, despite a monotonic increase in the atmospheric concentration of greenhouse gases. In this paper, we investigate whether the high orography of the Antarctic ice sheet (AIS) has helped delay warming over the continent. To that end, we contrast the Antarctic climate response to CO2-doubling with present-day orography to the response with a flattened AIS. To corroborate our findings, we perform this exercise with two different climate models. We find that, with a flattened AIS, CO2-doubling induces more latent heat transport toward the Antarctic continent, greater moisture convergence over the continent and, as a result, more surface-amplified condensational heating. Greater moisture convergence over the continent is made possible by flattening of moist isentropic surfaces, which decreases humidity gradients along the trajectories on which extratropical poleward moisture transport predominantly occurs, thereby enabling more moisture to reach the pole. Furthermore, the polar meridional cell disappears when the AIS is flattened, permitting greater CO2-forced warm temperature advection toward the Antarctic continent. Our results suggest that the high elevation of the present AIS plays a significant role in decreasing the susceptibility of the Antarctic continent to CO2-forced warming. © 2020, The Author(s).
语种	英语
scopus关键词	carbon dioxide; climate change; climate modeling; ice sheet; moisture transfer; orographic effect; Antarctic Ice Sheet; Antarctica
来源期刊	npj Climate and Atmospheric Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178027
作者单位	University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada; Columbia University, Department of Applied Physics and Applied Mathematics, and Department of Earth and Environmental Sciences, New York City, NY, United States
推荐引用方式 GB/T 7714	Singh H.A.,Polvani L.M.. Low Antarctic continental climate sensitivity due to high ice sheet orography[J],2020,3(1).
APA	Singh H.A.,&Polvani L.M..(2020).Low Antarctic continental climate sensitivity due to high ice sheet orography.npj Climate and Atmospheric Science,3(1).
MLA	Singh H.A.,et al."Low Antarctic continental climate sensitivity due to high ice sheet orography".npj Climate and Atmospheric Science 3.1(2020).