气候变化领域集成服务门户(CCPortal): Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period

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DOI	10.1016/j.quascirev.2020.106643
	Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period
	Zhao X.; Koutsodendris A.; Caley T.; Dupont L.
发表日期	2020
ISSN	0277-3791
卷号	249
英文摘要	The mid-Piacenzian Warm Period (mPWP, 3.264–3.025 Ma) of the Pliocene epoch has been proposed as an analog for future climate scenarios. Disagreement between the paleoenvironmental reconstruction and model simulations of the climate in subtropical regions for this period suggests that more investigation of the subtropical climate variability of the mPWP is needed. This study presents pollen, microcharcoal and benthic foraminifera oxygen isotope records generated from marine sediment cores of International Ocean Discovery Program (IODP) Exp. 361 Site U1479 from the Cape Basin offshore of South Africa for the period between 3.337 and 2.875 Ma. With an average sample resolution of 3 ka, this record represents the highest-resolution record of mPWP vegetation change from the region. Our results indicate that the vegetation during the mPWP was dominated by fynbos (species-rich heathy vegetation in the Cape Floristic Region) with variable proportions of Ericaceae. Moreover, the development of the Afrotemperate forest (tall, multilayered indigenous forests in South Africa) reflects shifts in the amounts of precipitation between winter and summer in the year-round rainfall zone. The vegetation variation is probably influenced by the latitudinal insolation gradient in response to precession forcing. Several glacials depicted by the benthic foraminifera oxygen isotope record were characterized by lower percentage values of Restionaceae, higher percentage values of ericoid fynbos and Afrotemperate forest. These events correspond well with cooler SE Atlantic sea surface temperatures driven by interactions of both atmospheric and oceanographic processes. The cooler sea surface temperatures attributed to Antarctic ice sheet expansion, reduced Agulhas leakage (heat and salt transfer from the Indian Ocean to the Atlantic Ocean) and/or intensified southern Benguela upwelling, resulted in less precipitation in the winter rainfall zone of South Africa. © 2020 Elsevier Ltd
英文关键词	Hydroclimate; IODP Site U1479; Mid-Piacenzian warm period; South Africa; Vegetation
语种	英语
scopus关键词	Atmospheric temperature; Cooling systems; Forestry; Isotopes; Oceanography; Offshore oil well production; Oxygen; Rain; Submarine geology; Submarine geophysics; Surface properties; Surface waters; Tropics; Vegetation; Benthic foraminifera; Future climate scenarios; Insolation gradients; Oceanographic process; Oxygen isotope records; Paleoenvironmental reconstruction; Sea surface temperature (SST); Subtropical climates; Climate models; benthic foraminifera; climate variation; fynbos; hydrometeorology; ice sheet; marine sediment; paleoenvironment; Pliocene; pollen; rainfall; sea surface temperature; seasonal variation; subtropical region; Angola; Atlantic Ocean; Benguela; Cape Basin; South Africa; Ericaceae; Foraminifera; Restionaceae
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/151244
作者单位	MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Straße, Bremen, D-28359, Germany; Institute of Earth Sciences, Heidelberg University, Im Neuenheimer Feld 234-236, Heidelberg, D-69120, Germany; EPOC, UMR 5805, CNRS, University of Bordeaux, Pessac, France
推荐引用方式 GB/T 7714	Zhao X.,Koutsodendris A.,Caley T.,et al. Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period[J],2020,249.
APA	Zhao X.,Koutsodendris A.,Caley T.,&Dupont L..(2020).Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period.Quaternary Science Reviews,249.
MLA	Zhao X.,et al."Hydroclimate change in subtropical South Africa during the mid-Piacenzian Warm Period".Quaternary Science Reviews 249(2020).