DOI: 10.1175/JCLI-D-16-0692.1
Scopus记录号: 2-s2.0-85022330742
论文题名: Wave events: Climatology, trends, and relationship to Northern Hemisphere winter blocking and weather extremes
作者: Martineau P. ; Chen G. ; Burrows D.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 15 起始页码: 5675
结束页码: 5697
语种: 英语
Scopus关键词: Atmospheric pressure
; Climate change
; Anticyclones
; Blocking
; Interannual variability
; Northern Hemispheres
; Troughs
; Climatology
英文摘要: Diagnostics of finite-amplitude local wave activity (LWA) are applied to the 500-hPa geopotential height field to diagnose persistent synoptic weather events of anomalously large wave activity in the Northern Hemisphere. By considering the cyclonic and anticyclonic components of LWA separately, persistent weather systems associated with large-amplitude troughs and ridges are detected. While anticyclonic wave events are predominantly found over Europe and Alaska, cyclonic wave events usually occur over East Asia and northeastern Canada. Those preferred regions correspond to the location of planetary-scale ridges and troughs, which contribute, together with transient anomalies, to the formation of wave events. Although wave events are not blocking events per definition, they are typically associated with increased blocking in their vicinity. Their spatial relationship to blocking, however, varies depending on their cyclonic or anticyclonic nature and the type of wave-breaking signatures. Wave events are also shown to be accompanied by warm or cold temperature extremes, whose spatial pattern depends on the type of events, cyclonic or anticyclonic, and the sector affected. Trends in the frequency of wave events indicate that cyclonic wave events and the associated cold extremes affecting East Asia have become more frequent in recent decades and could be linked to recent trends toward La Niña-like conditions in the Pacific and trends toward the negative phase of Arctic Oscillation. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48809
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, United States; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States
Recommended Citation:
Martineau P.,Chen G.,Burrows D.A.. Wave events: Climatology, trends, and relationship to Northern Hemisphere winter blocking and weather extremes[J]. Journal of Climate,2017-01-01,30(15)