气候变化领域集成服务门户(CCPortal): Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability

CCPortal

DOI	10.1007/s00382-020-05485-y
	Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability
	Hall R.J.; Hanna E.; Chen L.
发表日期	2021
ISSN	0930-7575
起始页码	1969
结束页码	1986
卷号	56 期号:2021-01-02
英文摘要	We investigate winter Arctic Amplification (AA) on synoptic timescales and at regional scales using a daily version of the Arctic Amplification Index (AAI) and examine causes on a synoptic scale. The persistence, frequency and intensity of high AAI events show significant increases over the Arctic. Similarly, low AAI events are decreasing in frequency, persistence and intensity. In both cases, there are regional variations in these trends, in terms of significance and timing. Significant trends in increasing persistence, frequency and intensity of high AAI events in winter are concentrated in the period 2000–2009, with few significant trends before and after this. There are some decreases in sea-ice concentration in response to synoptic-scale AA events and these AA events can contribute to the decadal trends in AA found in other studies. A sectoral analysis of the Arctic indicates that in the Beaufort–Chukchi and East Siberian–Laptev Seas, synoptic scale high AAI events can be driven by tropical teleconnections while in other Arctic sectors, it is the intrusion of moisture-transporting synoptic cyclones into the Arctic that is most important in synoptic-scale AA. The presence of Rossby wave breaking during high AAI events is indicative of forcing from lower latitudes, modulated by variations in the jet stream. An important conclusion is that the increased persistence, frequency and intensity of synoptic-scale high AAI events make significant contributions to the interannual trend in AA. © 2021, The Author(s).
英文关键词	Arctic; Arctic Amplification; Climate change; Extreme weather; Reanalysis; Synoptic
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/183556
作者单位	School of Geography and Lincoln Centre for Water & Planetary Health, University of Lincoln, Think Tank, Ruston Way, Lincoln, LN6 7FL, United Kingdom; School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Department of Earth Science, University of Bergen, Bergen, Norway
推荐引用方式 GB/T 7714	Hall R.J.,Hanna E.,Chen L.. Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability[J],2021,56(2021-01-02).
APA	Hall R.J.,Hanna E.,&Chen L..(2021).Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability.Climate Dynamics,56(2021-01-02).
MLA	Hall R.J.,et al."Winter Arctic Amplification at the synoptic timescale, 1979–2018, its regional variation and response to tropical and extratropical variability".Climate Dynamics 56.2021-01-02(2021).