DOI: 10.1073/pnas.1717707117
论文题名: Influence of Arctic sea-ice variability on Pacific trade winds
作者: Kennel C.F. ; Yulaeva E.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 6 起始页码: 2824
结束页码: 2834
语种: 英语
英文关键词: Aleutian Low
; Arctic sea ice
; Central Pacific El Nino
; Decadal variability
; Pacific trade winds
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162071
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Kennel C.F.,Yulaeva E.. Influence of Arctic sea-ice variability on Pacific trade winds[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(6)