气候变化领域集成服务门户(CCPortal): Rapid changes in the hydroclimate of southeast Africa during the mid- to late-Holocene

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DOI	10.1016/j.quascirev.2019.04.006
	Rapid changes in the hydroclimate of southeast Africa during the mid- to late-Holocene
	Humphries M.S.; Kirsten K.L.; McCarthy T.S.
发表日期	2019
ISSN	0277-3791
起始页码	178
结束页码	186
卷号	212
英文摘要	The nature and cause of past changes in rainfall over southeast Africa are widely debated and remain unresolved. Here we present a 5,700 year record of moisture balance in southeast Africa based on the high-resolution analysis of a sediment core from Lake Muzi, South Africa. Sediment composition and diatom assemblages document distinct fluctuations in lake level that reflect dramatic shifts in the balance between precipitation and evapotranspiration. The record reveals that climatic instability and episodic aridity were persistent features of the regional climate, with severe drought episodes recorded at 4600–4200, 3700–2600, 2100–1400 and 850–550 cal yr BP. We find correspondence between prominent periods of prolonged aridity at Lake Muzi and abrupt increases in El Niño frequency recorded in archives from the tropical Pacific, suggesting that changes in the El Niño-Southern Oscillation (ENSO) likely played an underlying role in driving hydroclimate fluctuations in southeast Africa during the mid-to late-Holocene. Periods of aridity may have been further conditioned by the influence of the subtropical Indian Ocean dipole (SIOD) and regional-scale circulation patterns that acted to modulate the local expression of El Niño. Our findings highlight the need to better understand the interplay between ENSO teleconnections, Indian Ocean sea surface temperatures and regional-scale drivers, and how these act to control rainfall in southeast Africa, particularly under a changing climate. © 2019 Elsevier Ltd
英文关键词	Aridity; ENSO; Holocene; Palaeoclimate; Southern Africa
语种	英语
scopus关键词	Atmospheric pressure; Lakes; Oceanography; Rain; Tropics; Aridity; ENSO; Holocenes; Palaeoclimate; Southern Africa; Climatology; aridity; atmospheric circulation; atmospheric moisture; diatom; El Nino; El Nino-Southern Oscillation; episodic event; evapotranspiration; Holocene; hydrometeorology; Indian Ocean Dipole; lacustrine deposit; lake level; paleoclimate; precipitation (climatology); rainfall; sea surface temperature; sediment core; teleconnection; Indian Ocean; Pacific Ocean; Pacific Ocean (Tropical); South Africa; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151942
作者单位	Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa; Department of Environmental and Geographical Science, University of Cape Town, Cape Town, South Africa; School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa
推荐引用方式 GB/T 7714	Humphries M.S.,Kirsten K.L.,McCarthy T.S.. Rapid changes in the hydroclimate of southeast Africa during the mid- to late-Holocene[J],2019,212.
APA	Humphries M.S.,Kirsten K.L.,&McCarthy T.S..(2019).Rapid changes in the hydroclimate of southeast Africa during the mid- to late-Holocene.Quaternary Science Reviews,212.
MLA	Humphries M.S.,et al."Rapid changes in the hydroclimate of southeast Africa during the mid- to late-Holocene".Quaternary Science Reviews 212(2019).