气候变化领域集成服务门户(CCPortal): High-resolution geochemical records of extreme drought in southeastern Africa during the past 7000 years

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DOI	10.1016/j.quascirev.2020.106294
	High-resolution geochemical records of extreme drought in southeastern Africa during the past 7000 years
	Humphries M.; Green A.; Higgs C.; Strachan K.; Hahn A.; Pillay L.; Zabel M.
发表日期	2020
ISSN	0277-3791
卷号	236
英文摘要	The magnitude and frequency of extreme events is projected to increase under future climate change and understanding the major drivers of global climate variability is dependent on the development of detailed records from critical regions. Subtropical Africa is known to have undergone phases of significant change resulting from variations in broad-scale atmospheric and oceanic circulation patterns, but the nature and cause for these variations remain intensely debated. Here we present a highly resolved sedimentary record from the eastern margin of South Africa to reconstruct hydroclimate in southeast Africa over the past 7000 years. Stratigraphic and inorganic proxies preserve a highly sensitive record that document dramatic shifts in moisture balance, with phases of severe drought recorded at 4700–4200 and 3700–2600 cal yr BP. We suggest that pronounced hydroclimate variability observed in the Mkhuze record was likely triggered by changes in the activity of El Niño-Southern Oscillation (ENSO), which acted to control the transport of moisture from the Indian Ocean across southeast Africa. We show that rapid shifts in moisture availability were a characteristic feature of mid-late Holocene climate across the summer rainfall region of southern Africa, with these events broadly anti-phased with hydroclimatic shifts in East Africa and northwest Madagascar. These findings suggest that evaluating drought frequency, ecological risk and food security within the region is likely to be closely tied to ENSO and its response to future global warming. © 2020 Elsevier Ltd
英文关键词	Aridity; El niño; Holocene; Inorganic geochemistry; Paleoclimatology; Southern africa
语种	英语
scopus关键词	Atmospheric pressure; Food supply; Global warming; Moisture; Rain; Stratigraphy; Ecological risks; Global climates; Moisture balance; Oceanic circulation patterns; Sedimentary records; Southeastern Africa; Southern oscillation; Summer rainfall; Drought; drought stress; El Nino-Southern Oscillation; extreme event; geochemical survey; lithostratigraphy; oceanic circulation; paleoclimate; sediment chemistry; subtropical region; South Africa
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/151495
作者单位	School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa; Geological Sciences, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, South Africa; School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South Africa; MARUM Centre for Marine Environmental Sciences, University of Bremen, Bremen, Germany
推荐引用方式 GB/T 7714	Humphries M.,Green A.,Higgs C.,et al. High-resolution geochemical records of extreme drought in southeastern Africa during the past 7000 years[J],2020,236.
APA	Humphries M..,Green A..,Higgs C..,Strachan K..,Hahn A..,...&Zabel M..(2020).High-resolution geochemical records of extreme drought in southeastern Africa during the past 7000 years.Quaternary Science Reviews,236.
MLA	Humphries M.,et al."High-resolution geochemical records of extreme drought in southeastern Africa during the past 7000 years".Quaternary Science Reviews 236(2020).