气候变化领域集成服务门户(CCPortal): Arctic cyclone activity and the beaufort high

CCPortal

DOI	10.1175/JCLI-D-20-0771.1
	Arctic cyclone activity and the beaufort high
	Kenigson J.S.; Timmermans M.-L.
发表日期	2021
ISSN	08948755
起始页码	4119
结束页码	4127
卷号	34 期号:10
英文摘要	The Beaufort high (BH) and its accompanying anticyclonic winds drive the Arctic Ocean’s Beaufort Gyre, the major freshwater reservoir of the Arctic Ocean. The Beaufort Gyre circulation and its capacity to accumulate or release freshwater rely on the BH intensity. The migration of Nordic seas cyclones into the Arctic has been hypothesized to moderate the strength of the BH. We explore this hypothesis by analyzing reanalysis sea level pressure fields to characterize the BH and identify and track cyclones north of 608N during 1948–2019. A cluster analysis of Nordic seas cyclone trajectories reveals a western pathway (through the Arctic interior) associated with a relatively weak BH and an eastern pathway (along the Arctic periphery) associated with a relatively strong BH. Furthermore, we construct cyclone activity indices (CAIs) in the Arctic and Nordic seas that take into account multiple cyclone parameters (number, strength, and duration). There are significant correlations between the BH and the CAIs in the Arctic and Nordic seas during 1948–2019, with anomalously strong cyclone activity related to an anomalously weak BH, and vice versa. We show how the Arctic and Nordic seas CAIs experienced a regime shift toward increased cyclone activity between the first four decades analyzed (1948–88) and the most recent three decades (1989–2019). Over the same two time periods, the BH exhibits a weakening. Increased cyclone activity and an accompanying weakening of the BH may be consistent with expectations in a warming Arctic and have implications for Beaufort Gyre dynamics and freshwater. © 2021 American Meteorological Society.
英文关键词	Arctic; Atmosphere; Atmosphere–ocean interaction; Extratropical cyclones
语种	英语
scopus关键词	Cluster analysis; Sea level; Water; Arctic ocean; Cyclone activity; Cyclone trajectories; Freshwater reservoirs; Gyre circulation; Regime shift; Sea-level pressure fields; Time-periods; Storms
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178558
作者单位	Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States
推荐引用方式 GB/T 7714	Kenigson J.S.,Timmermans M.-L.. Arctic cyclone activity and the beaufort high[J],2021,34(10).
APA	Kenigson J.S.,&Timmermans M.-L..(2021).Arctic cyclone activity and the beaufort high.Journal of Climate,34(10).
MLA	Kenigson J.S.,et al."Arctic cyclone activity and the beaufort high".Journal of Climate 34.10(2021).