气候变化领域集成服务门户(CCPortal): Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback

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DOI	10.1029/2020GL088965
	Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback
	Hahn L.C.; Armour K.C.; Battisti D.S.; Donohoe A.; Pauling A.G.; Bitz C.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	The lapse rate feedback is the dominant driver of stronger warming in the Arctic than the Antarctic in simulations with increased CO2. While Antarctic surface elevation has been implicated in promoting a weaker Antarctic lapse rate feedback, the mechanisms in which elevation impacts the lapse rate feedback are still unclear. Here we suggest that weaker Antarctic warming under CO2 forcing stems from shallower, less intense climatological inversions due to limited atmospheric heat transport above the ice sheet elevation and elevation-induced katabatic winds. In slab ocean model experiments with flattened Antarctic topography, stronger climatological inversions support a stronger lapse rate feedback and annual mean Antarctic warming comparable to the Arctic under CO2 doubling. Unlike the Arctic, seasonality in warming over flat Antarctica is mainly driven by a negative shortwave cloud feedback, which exclusively dampens summer warming, with a smaller contribution from the winter-enhanced lapse rate feedback. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atmospheric movements; Topography; Atmospheric heat; Cloud feedbacks; Hemi-spheric asymmetries; Ice-sheet elevation; Katabatic winds; Slab ocean models; Summer warming; Surface elevations; Carbon dioxide; asymmetry; atmospheric lapse rate; carbon dioxide; climate feedback; experimental study; ice sheet; seasonality; shortwave radiation; topography; warming; Antarctica; Arctic
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169900
作者单位	Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; School of Oceanography, University of Washington, Seattle, WA, United States; Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Hahn L.C.,Armour K.C.,Battisti D.S.,et al. Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback[J],2020,47(16).
APA	Hahn L.C.,Armour K.C.,Battisti D.S.,Donohoe A.,Pauling A.G.,&Bitz C.M..(2020).Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback.Geophysical Research Letters,47(16).
MLA	Hahn L.C.,et al."Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback".Geophysical Research Letters 47.16(2020).