globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-015-2836-2
Scopus记录号: 2-s2.0-84942011747
论文题名:
Interannual variability of seasonal rainfall over the Cape south coast of South Africa and synoptic type association
作者: Engelbrecht C.J.; Landman W.A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期:2017-01-02
起始页码: 295
结束页码: 313
语种: 英语
英文关键词: Cape south coast of South Africa ; El Niño Southern Oscillation ; Interannual rainfall variability ; Intraseasonal predictability ; Southern Annular Mode ; Synoptic types
英文摘要: The link between interannual variability of seasonal rainfall over the Cape south coast of South Africa and different synoptic types as well as selected teleconnections is explored. Synoptic circulation over the region is classified into different synoptic types by employing a clustering technique, the self-organizing map (SOM), on daily circulation data for the 33-year period from 1979 to 2011. Daily rainfall data are used to investigate interannual variability of seasonal rainfall within the context of the identified synoptic types. The anomalous frequency of occurrence of the different synoptic types for wet and for dry seasons differs significantly within the SOM space, except for austral spring. The main rainfall-producing synoptic types are to a large extent consistent for wet and dry seasons. The main rainfall-producing synoptic types have a notable larger contribution to seasonal rainfall totals during wet seasons than during dry seasons, consistent with a higher frequency of occurrence of the main rainfall-producing synoptic types during wet seasons compared to dry seasons. Dry seasons are characterized by a smaller contribution to seasonal rainfall totals by all the different synoptic types, but with the largest negative anomalies associated with low frequencies of the main rainfall-producing synoptic types. The frequencies of occurrence of specific configurations of ridging high pressure systems, cut-off lows and tropical-temperate troughs associated with rainfall are positively linked to interannual variability of seasonal rainfall. It is also shown that the distribution of synoptic types within the SOM space is linked to the Southern Annular Mode and El Niño Southern Oscillation, implying some predictability of intraseasonal variability at the seasonal time scale. © 2015, Springer-Verlag Berlin Heidelberg.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53662
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

Recommended Citation:
Engelbrecht C.J.,Landman W.A.. Interannual variability of seasonal rainfall over the Cape south coast of South Africa and synoptic type association[J]. Climate Dynamics,2016-01-01,47(2017-01-02)
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