气候变化领域集成服务门户(CCPortal): Influence of Arctic sea-ice variability on Pacific trade winds

CCPortal

DOI	10.1073/pnas.1717707117
	Influence of Arctic sea-ice variability on Pacific trade winds
	Kennel C.F.; Yulaeva E.
发表日期	2020
ISSN	0027-8424
起始页码	2824
结束页码	2834
卷号	117 期号:6
英文摘要	A conceptual model connecting seasonal loss of Arctic sea ice to midlatitude extreme weather events is applied to the 21st-century intensification of Central Pacific trade winds, emergence of Central Pacific El Nino events, and weakening of the North Pacific Aleutian Low Circulation. According to the model, Arctic Ocean warming following the summer sea-ice melt drives vertical convection that perturbs the upper troposphere. Static stability calculations show that upward convection occurs in annual 40- to 45-d episodes over the seasonally ice-free areas of the Beaufort-to-Kara Sea arc. The episodes generate planetary waves and higher-frequency wave trains that transport momentum and heat southward in the upper troposphere. Regression of upper tropospheric circulation data on September sea-ice area indicates that convection episodes produce wave-mediated teleconnections between the maximum ice-loss region north of the Siberian Arctic coast and the Intertropical Convergence Zone (ITCZ). These teleconnections generate oppositely directed trade-wind anomalies in the Central and Eastern Pacific during boreal winter. The interaction of upper troposphere waves with the ITCZ air–sea column may also trigger Central Pacific El Nino events. Finally, waves reflected northward from the ITCZ air column and/or generated by triggered El Nino events may be responsible for the late winter weakening of the Aleutian Low Circulation in recent years. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Aleutian Low; Arctic sea ice; Central Pacific El Nino; Decadal variability; Pacific trade winds
语种	英语
scopus关键词	Arctic Ocean; article; calculation; clinical article; conceptual model; El Nino; extreme weather; heat; sea ice; seashore; summer; thermodynamics; troposphere; warming; winter
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158853
作者单位	Kennel, C.F., Scripps Institution of Oceanography, University of California San Diego, San diego, CA 92093, United States, Centre for Science and Policy, University of Cambridge, Cambridge, CB2 3BU, United Kingdom; Yulaeva, E., San Diego Supercomputer Center, University of California San Diego, San diego, CA 92093, United States
推荐引用方式 GB/T 7714	Kennel C.F.,Yulaeva E.. Influence of Arctic sea-ice variability on Pacific trade winds[J],2020,117(6).
APA	Kennel C.F.,&Yulaeva E..(2020).Influence of Arctic sea-ice variability on Pacific trade winds.Proceedings of the National Academy of Sciences of the United States of America,117(6).
MLA	Kennel C.F.,et al."Influence of Arctic sea-ice variability on Pacific trade winds".Proceedings of the National Academy of Sciences of the United States of America 117.6(2020).