气候变化领域集成服务门户(CCPortal): On the Linkage Between Rossby Wave Phase Speed; Atmospheric Blocking; and Arctic Amplification

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DOI	10.1029/2020GL087796
	On the Linkage Between Rossby Wave Phase Speed; Atmospheric Blocking; and Arctic Amplification
	Riboldi J.; Lott F.; D'Andrea F.; Rivière G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	It has been hypothesized that enhanced Arctic warming with respect to midlatitudes, known as Arctic amplification, had led to a deceleration of eastward propagating Rossby waves, more frequent atmospheric blocking, and extreme weather in recent decades. We employ a novel, daily climatology of Rossby wave phase speed between March 1979 and November 2018, based on upper-level wind data, to test this hypothesis and describe phase speed variability. The diagnostic distinguishes between periods of enhanced or reduced eastward wave propagation and is related to the occurrence of blocking and extreme temperatures over midlatitudes. While remaining tied to the upper-level geopotential gradient, decadal trends in phase speed did not accompany the observed reduction in the low-level temperature gradient. These results confirm the link between low phase speeds and extreme temperature events, but indicate that Arctic amplification did not play a decisive role in modulating phase speed variability in recent decades. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Mechanical waves; Speed; Wave propagation; Arctic warming; Atmospheric blocking; Extreme temperature events; Extreme temperatures; Geopotential gradients; Midlatitudes; Phase speed; Rossby wave; Amplification; amplification; decadal variation; extreme event; geopotential; high temperature; low temperature; Rossby wave; warming; wave propagation; wind velocity; 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/169679
作者单位	Laboratoire de Météorologie Dynamique/IPSL, École Normale Supérieure, PSL Université, Sorbonne Université, École Polytechnique, IP Paris, CNRS, Paris, France
推荐引用方式 GB/T 7714	Riboldi J.,Lott F.,D'Andrea F.,et al. On the Linkage Between Rossby Wave Phase Speed; Atmospheric Blocking; and Arctic Amplification[J],2020,47(19).
APA	Riboldi J.,Lott F.,D'Andrea F.,&Rivière G..(2020).On the Linkage Between Rossby Wave Phase Speed; Atmospheric Blocking; and Arctic Amplification.Geophysical Research Letters,47(19).
MLA	Riboldi J.,et al."On the Linkage Between Rossby Wave Phase Speed; Atmospheric Blocking; and Arctic Amplification".Geophysical Research Letters 47.19(2020).