气候变化领域集成服务门户(CCPortal): Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape

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DOI	10.1016/j.quascirev.2024.108563
	Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape
	Chase, Brian M.; Boom, Arnoud; Carr, Andrew S.; Reimer, Paula J.
发表日期	2024
ISSN	0277-3791
EISSN	1873-457X
起始页码	330
卷号	330
英文摘要	This paper explores the Holocene climatic dynamics of South Africa's southern Cape, a region that supports a large proportion of the Greater Cape Floristic Region and contains an array of important archaeological sites. While South African climates are generally characterised by marked rainfall seasonality, the southern Cape is currently situated at the interface between tropical and temperate climate systems, resulting in a largely aseasonal rainfall regime. This regime, however, is thought to have been particularly sensitive to past changes in late Quaternary boundary conditions, meaning that variability in either tropical or temperate systems could have significant environmental impacts. Evidence of past climate change, however, remains limited. We present a 9000-year record of hydroclimatic variability obtained from rock hyrax midden stable nitrogen records, from Papkuilsfontein, on the southern slope of the Anysberg Mountains. Resolved to an average 6-year resolution and spanning the period c. 9050 cal yr BP to 1990 CE, this is the highest resolution Holocene record from southern Africa and presents a unique opportunity for the detailed study of the primary drivers and spatial gradients of Holocene climate change in the southern Cape. The data indicate a long-term decrease in aridity across the Holocene and a pattern of variability that reveals remarkable similarities with records from the South African tropics and El Nino-Southern Oscillation proxies, highlighting the significance of tropical systems as drivers of Holocene climate change in the region. This substantially expands what has been previously considered to be the zone of tropical influence, extending from a coastal phenomenon associated with heat transport via the Agulhas Current to encompass much, if not all, of the Agulhas Plain south of the Cape Fold Mountains. These findings provide a valuable new climatic framework for contextualizing changes in ecological and archaeological records in the southern Cape, and contribute to a more comprehensive understanding of the spatio-temporal dynamics of climate systems in southern Africa.
英文关键词	Holocene; South Africa; Palaeoclimate; Climate dynamics; ENSO; Rock hyrax middens; Stable isotopes
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:001207143700001
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/287605
作者单位	Institut de Recherche pour le Developpement (IRD); Universite PSL; Ecole Pratique des Hautes Etudes (EPHE); Universite de Montpellier; Centre National de la Recherche Scientifique (CNRS); University of Cape Town; University of Leicester; Queens University Belfast
推荐引用方式 GB/T 7714	Chase, Brian M.,Boom, Arnoud,Carr, Andrew S.,et al. Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape[J],2024,330.
APA	Chase, Brian M.,Boom, Arnoud,Carr, Andrew S.,&Reimer, Paula J..(2024).Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape.QUATERNARY SCIENCE REVIEWS,330.
MLA	Chase, Brian M.,et al."Tropical forcing and ENSO dominate Holocene climates in South Africa's southern Cape".QUATERNARY SCIENCE REVIEWS 330(2024).