DOI: 10.1007/s00382-014-2169-6
Scopus记录号: 2-s2.0-84939875578
论文题名: Relating changes in synoptic circulation to the surface rainfall response using self-organising maps
作者: Lennard C. ; Hegerl G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 44, 期: 2017-03-04 起始页码: 861
结束页码: 879
语种: 英语
英文关键词: Circulation archetypes
; Downscaling
; Extreme rainfall
; Rainfall response
; Self-organising maps
英文摘要: The climate of a particular region is governed by factors that may be remote, such as the El Nino Southern Oscillation or local, such as topography. However, the daily weather characteristics of a region are controlled by the synoptic-scale atmospheric state. Therefore changes in the type, frequency, duration or intensity of particular synoptic states over a region would result in changes to the local weather and long-term climatology of the region. The relationship between synoptic-scale circulation and the rainfall response is examined for a 31-year period at two stations in different rainfall regimes in South Africa. Dominant rain-bearing synoptic circulations are identified for austral winter and summer as mid-latitude cyclones and convective systems respectively whereas no circulations are dominantly associated with spring and autumn rainfall. Over the 31-year period a statistically significant increase in the frequency of characteristic summer circulation modes is observed during summer, winter and spring. During autumn a statistically significant shift towards characteristically winter circulation modes is evident. Seasonal rainfall trends computed at each station corroborate those of the circulation data. Extreme rainfall is associated with particular circulation modes and trends in both circulation and station data show an earlier occurrence of extreme rainfall during the rainy season. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54550
Appears in Collections: 过去全球变化的重建
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作者单位: Climate System Analysis Group, Environmental and Geographical Science Department, South Lane, University of Cape Town, Rondebosch, Cape Town, South Africa; School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom
Recommended Citation:
Lennard C.,Hegerl G.. Relating changes in synoptic circulation to the surface rainfall response using self-organising maps[J]. Climate Dynamics,2014-01-01,44(2017-03-04)