DOI: 10.1007/s00382-014-2230-5
Scopus记录号: 2-s2.0-84939891357
论文题名: A synoptic decomposition of rainfall over the Cape south coast of South Africa
作者: Engelbrecht C.J. ; Landman W.A. ; Engelbrecht F.A. ; Malherbe J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-09-10 起始页码: 2589
结束页码: 2607
语种: 英语
英文关键词: All-year rainfall region
; Cape south coast of South Africa
; Cut-off lows
; Ridging high pressure systems
; Synoptic types
英文摘要: A synoptic climatology is derived for the Cape south coast region of South Africa by application of the self-organizing map (SOM) technique. The SOM is applied to average daily low-level circulation fields, as represented by sea-level pressure anomalies for the period 1979–2011. This coastal region receives rainfall all-year round with slight peaks during March–April and with more pronounced peaks during August and October–November. The synoptic forcing responsible for this annual multi-modal rainfall distribution is identified, and the relative contribution of different synoptic types to the annual rainfall is quantified. Ridging high pressure systems contribute to 46 % of the annual rainfall, while tropical–temperate troughs contribute 28 %. Cut-off lows (COLs) co-occurring with ridging highs and tropical–temperate troughs are associated with 16 % of the annual rainfall total. The contribution of ridging high pressure systems decreases from south to north, whilst the opposite is true for tropical–temperate troughs. COLs, ridging high pressure systems and tropical–temperate troughs are associated with the March–April rainfall peak, while COLs are largely associated with the August rainfall peak. Ridging high pressure systems and to a lesser extent tropical–temperate troughs, are responsible for the October peak observed along the coast, while the November peak over the adjacent interior regions is associated with COLs that occur in combination with the tropical–temperate troughs during this month. © 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/54207
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Soil, Climate and Water, Agricultural Research Council, Pretoria, South Africa; Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria, South Africa; Climate Studies, Modelling and Environmental Health, CSIR Natural Resources and Environment, Pretoria, South Africa; GAES, University of the Witwatersrand, Pretoria, South Africa
Recommended Citation:
Engelbrecht C.J.,Landman W.A.,Engelbrecht F.A.,et al. A synoptic decomposition of rainfall over the Cape south coast of South Africa[J]. Climate Dynamics,2015-01-01,44(2017-09-10)