气候变化领域集成服务门户(CCPortal): Dynamical connection between the stratospheric Arctic vortex and sea surface temperatures in the North Atlantic

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DOI	10.1007/s00382-019-04971-2
	Dynamical connection between the stratospheric Arctic vortex and sea surface temperatures in the North Atlantic
	Hu D.; Guan Z.; Guo Y.; Lu C.; Jin D.
发表日期	2019
ISSN	0930-7575
起始页码	6979
结束页码	6993
卷号	53 期号:11
英文摘要	We used two long-term reanalysis datasets and time-slice simulations to examine the decadal relationship between the stratospheric Arctic vortex (SAV) and sea surface temperature anomalies (SSTAs) in the North Atlantic and the dynamic mechanisms involved in the linkage between the two. Our results show that there is a significant decadal linkage between SSTAs over the North Atlantic and the SAV, where warmed (cooled) SSTAs over the North Atlantic in association with its principal mode correspond to a weakened (strengthened) SAV. The warmed North Atlantic SSTAs tend to result in a weakened SAV via two dynamic processes: (1) constructive interference at high latitudes with a ridge in the Atlantic sector and a trough in the Pacific accompanied by a negative North Atlantic Oscillation-like pattern over the North Atlantic and a weakened Aleutian low over the North Pacific; and (2) more wavenumber-1 waves propagated into the Arctic stratosphere by modifying the baroclinic term of the zonal mean background state and altering the propagating conditions around the tropopause over the Arctic. Results from reanalysis and model simulations both suggest that a strengthening wave intensity in the high-latitude troposphere and more upward propagation of the planetary wavenumber-1 wave in response to the warmed North Atlantic SSTAs conjunctly contribute to the increased planetary wave flux in the Arctic stratosphere, facilitating a weakened SAV. These results provide a new understanding of what dynamic processes control the SAV, and will help to predict the stratosphere on decadal timescales. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	atmospheric dynamics; computer simulation; data set; decadal variation; North Atlantic Oscillation; sea surface temperature; stratosphere; vortex; zonal wind; Atlantic Ocean; Atlantic Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145796
作者单位	Key Laboratory of Meteorological Disasters of China Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, 210044, China; Key Laboratory of Mesoscale Severe Weather, Ministry of Education, and School of Atmospheric Sciences, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
推荐引用方式 GB/T 7714	Hu D.,Guan Z.,Guo Y.,et al. Dynamical connection between the stratospheric Arctic vortex and sea surface temperatures in the North Atlantic[J],2019,53(11).
APA	Hu D.,Guan Z.,Guo Y.,Lu C.,&Jin D..(2019).Dynamical connection between the stratospheric Arctic vortex and sea surface temperatures in the North Atlantic.Climate Dynamics,53(11).
MLA	Hu D.,et al."Dynamical connection between the stratospheric Arctic vortex and sea surface temperatures in the North Atlantic".Climate Dynamics 53.11(2019).