气候变化领域集成服务门户(CCPortal): A classification of synoptic weather patterns linked to extreme rainfall over the Limpopo River Basin in southern Africa

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DOI	10.1007/s00382-019-04829-7
	A classification of synoptic weather patterns linked to extreme rainfall over the Limpopo River Basin in southern Africa
	Rapolaki R.S.; Blamey R.C.; Hermes J.C.; Reason C.J.C.
发表日期	2019
ISSN	0930-7575
起始页码	2265
结束页码	2279
卷号	53 期号:2020-03-04
英文摘要	In the last few decades, the Limpopo River Basin (LRB) has experienced a number of extreme rainfall events which were responsible for considerable socio-economic and environmental impacts. Most of the population here is poor and dependent on rain-fed agriculture. In order to better understand these events over the LRB, CHIRPS, 0.05° gridded rainfall data are used to identify the daily extreme events, analyse their interannual variability and examine relationships with large scale climate modes over the 1981–2016 period. Analysis of the top 20 events suggests a pattern with rainfall generally decreasing from the eastern to western parts of the basin. Typically, the highest rainfall amounts occur over the regions where there are steep topographical gradients between the mountainous regions of northeastern South Africa and the Mozambican floodplains. Almost half of the top 200 extreme events are associated with tropical extra-tropical cloud bands (48%), with tropical low-pressure systems (28%), Mesoscale Convective Systems (14%), and cut-off lows (10%) in the mid-upper atmosphere, also making sizeable contributions. The monthly distribution of the events showed that most of the events occurred during the late summer months (January–March) when tropical lows and cloud bands are more common. On interannual time-scales, most of the summers with above average number of events coincide with La Niña conditions and, to lesser extent, a positive subtropical South Indian Ocean Dipole. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Cloud bands; ENSO; Extreme rainfall events; Limpopo River Basin; Tropical low-pressure
语种	英语
scopus关键词	climate classification; cloud cover; convective system; El Nino-Southern Oscillation; extreme event; floodplain; low pressure system; mesoscale meteorology; mountain region; precipitation intensity; rainband; rainfall; regional climate; synoptic meteorology; Limpopo Basin; Mozambique
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146086
作者单位	Department of Oceanography, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa; SAEON Egagasini Node, Private Bag X2, Roggebaai, Cape Town, 8012, South Africa
推荐引用方式 GB/T 7714	Rapolaki R.S.,Blamey R.C.,Hermes J.C.,et al. A classification of synoptic weather patterns linked to extreme rainfall over the Limpopo River Basin in southern Africa[J],2019,53(2020-03-04).
APA	Rapolaki R.S.,Blamey R.C.,Hermes J.C.,&Reason C.J.C..(2019).A classification of synoptic weather patterns linked to extreme rainfall over the Limpopo River Basin in southern Africa.Climate Dynamics,53(2020-03-04).
MLA	Rapolaki R.S.,et al."A classification of synoptic weather patterns linked to extreme rainfall over the Limpopo River Basin in southern Africa".Climate Dynamics 53.2020-03-04(2019).