气候变化领域集成服务门户(CCPortal): Linking midlatitudes eddy heat flux trends and polar amplification

CCPortal

DOI	10.1038/s41612-020-0111-7
	Linking midlatitudes eddy heat flux trends and polar amplification
	Chemke R.; Polvani L.M.
发表日期	2020
ISSN	23973722
卷号	3 期号:1
英文摘要	Eddy heat fluxes play the important role of transferring heat from low to high latitudes, thus affecting midlatitude climate. The recent and projected polar warming, and its effects on the meridional temperature gradients, suggests a possible weakening of eddy heat fluxes. We here examine this question in reanalyses and state-of-the-art global climate models. In the Northern Hemisphere we find that the eddy heat flux has robustly weakened over the last four decades. We further show that this weakening emerged from the internal variability around the year 2000, and we attribute it to increasing greenhouse gases. In contrast, in the Southern Hemisphere we find that the eddy heat flux has robustly strengthened, and we link this strengthening to the recent multi-decadal cooling of Southern-Ocean surface temperatures. The inability of state-of-the-art climate models to simulate such cooling prevents them from capturing the observed Southern Hemisphere strengthening of the eddy heat flux. This discrepancy between models and reanalyses provides a clear example of how model biases in polar regions can affect the midlatitude climate. © 2020, The Author(s).
语种	英语
scopus关键词	eddy; heat flux; heat transfer; midlatitude environment; Northern Hemisphere; polar region; Southern Hemisphere; temperature gradient; Southern Ocean
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/178053
作者单位	Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, United States; Department of Earth and Environmental Sciences, and Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States
推荐引用方式 GB/T 7714	Chemke R.,Polvani L.M.. Linking midlatitudes eddy heat flux trends and polar amplification[J],2020,3(1).
APA	Chemke R.,&Polvani L.M..(2020).Linking midlatitudes eddy heat flux trends and polar amplification.npj Climate and Atmospheric Science,3(1).
MLA	Chemke R.,et al."Linking midlatitudes eddy heat flux trends and polar amplification".npj Climate and Atmospheric Science 3.1(2020).