气候变化领域集成服务门户(CCPortal): The weakening summer circulation in the Northern Hemisphere mid-latitudes

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DOI	10.1126/science.1261768
	The weakening summer circulation in the Northern Hemisphere mid-latitudes
	Coumou D.; Lehmann J.; Beckmann J.
发表日期	2015
ISSN	0036-8075
起始页码	324
结束页码	327
卷号	348 期号:6232
英文摘要	Rapid warming in the Arctic could influence mid-latitude circulation by reducing the poleward temperature gradient. The largest changes are generally expected in autumn or winter, but whether significant changes have occurred is debated. Here we report significant weakening of summer circulation detected in three key dynamical quantities: (i) the zonal-mean zonal wind, (ii) the eddy kinetic energy (EKE), and (iii) the amplitude of fast-moving Rossby waves. Weakening of the zonal wind is explained by a reduction in the poleward temperature gradient. Changes in Rossby waves and EKE are consistent with regression analyses of climate model projections and changes over the seasonal cycle. Monthly heat extremes are associated with low EKE, and thus the observed weakening might have contributed to more persistent heat waves in recent summers. © 2015, American Association for the Advancement of Science. All rights reserved.
英文关键词	amplitude; climate modeling; kinetic energy; latitudinal gradient; Northern Hemisphere; Rossby wave; seasonal variation; temperature gradient; zonal wind; air temperature; altitude; Arctic; Article; autumn; environmental temperature; hypobarism; latitude; North Atlantic oscillation; Northern Hemisphere; priority journal; sea surface temperature; seasonal variation; signal noise ratio; summer; troposphere; winter; Arctic
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243410
作者单位	Potsdam Institute for Climate Impact Research, Earth System Analysis, Potsdam, 14412, Germany; University of Potsdam, Potsdam, Germany
推荐引用方式 GB/T 7714	Coumou D.,Lehmann J.,Beckmann J.. The weakening summer circulation in the Northern Hemisphere mid-latitudes[J],2015,348(6232).
APA	Coumou D.,Lehmann J.,&Beckmann J..(2015).The weakening summer circulation in the Northern Hemisphere mid-latitudes.Science,348(6232).
MLA	Coumou D.,et al."The weakening summer circulation in the Northern Hemisphere mid-latitudes".Science 348.6232(2015).