干旱区生态环境知识资源中心(Arid): Mid- and low latitude effects on eastern South African rainfall over the Holocene

Arid

DOI	10.1016/j.quascirev.2019.106088
	Mid- and low latitude effects on eastern South African rainfall over the Holocene
	Miller, Charlotte; Hahn, Annette; Liebrand, Diederik; Zabel, Matthias; Schefuss, Enno
通讯作者	Miller, Charlotte
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
出版年	2020
卷号	229
英文摘要	Climate variability and its forcings in eastern South Africa during the late Quaternary remain poorly understood with data suggesting temporal variability and spatial heterogeneity. To constrain the variability and the drivers of past climate, we explore vegetation (C-3/C-4) and hydrological change using stable carbon and hydrogen isotopes of plant-waxes and X-ray fluorescence (XRF) analysis in marine core GeoB20610-2 offshore the Limpopo River. We find evidence for two climatic phases: an initial arid phase (c. 7-3 cal kyr BP), followed by a wetter phase (c. 3-0 cal kyr BP). To put our findings into a regional context, we investigate a latitudinal transect of sites along eastern South Africa and divide the region into three distinct hydro-climatic zones, with significantly different climate drivers. During the last c. 3 cal. ka BP, wet climatic conditions dominated the northern summer rainfall zone (SRZ) and the southern South African zone (SSAZ), whereas arid conditions prevailed in the central and eastern SRZ. In the northern SRZ the climate was driven by local insolation, where heightened insolation resulted in more precipitation. The aridity during the last c. 3 cal. ka BP in the central and eastern SRZ and the increased humidity in the SSAZ are attributed to an equatorward displacement of the southern hemisphere westerlies, the South African high-pressure cell and the South Indian Ocean Convergence Zone (SIOCZ). For the Holocene we find little evidence for an Indian Ocean SST control on climate. The results for the Limpopo River catchment region highlight the spatial heterogeneity of Holocene climate conditions in eastern South Africa and indicate significant latitudinal differences in climate drivers. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	Eastern South Africa n-alkanes Hydrogen isotopes Carbon isotopes XRF analysis Southern hemisphere westerlies Tropical easterlies Insolation South indian ocean convergence zone
类型	Article
语种	英语
国家	Germany
收录类别	SCI-E
WOS记录号	WOS:000514018700007
WOS关键词	HYDROGEN-ISOTOPIC COMPOSITION ; SEA-SURFACE TEMPERATURES ; INDIAN CONVERGENCE ZONE ; HIGH-RESOLUTION RECORD ; HEMISPHERE WESTERLIES ; CLIMATIC VARIABILITY ; VEGETATION DYNAMICS ; LAST DEGLACIATION ; MFABENI PEATLAND ; FOREST HISTORY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315385
作者单位	Univ Bremen, MARUM Ctr Marine Environm Sci, Leobener Str 8, D-28359 Bremen, Germany
推荐引用方式 GB/T 7714	Miller, Charlotte,Hahn, Annette,Liebrand, Diederik,et al. Mid- and low latitude effects on eastern South African rainfall over the Holocene[J],2020,229.
APA	Miller, Charlotte,Hahn, Annette,Liebrand, Diederik,Zabel, Matthias,&Schefuss, Enno.(2020).Mid- and low latitude effects on eastern South African rainfall over the Holocene.QUATERNARY SCIENCE REVIEWS,229.
MLA	Miller, Charlotte,et al."Mid- and low latitude effects on eastern South African rainfall over the Holocene".QUATERNARY SCIENCE REVIEWS 229(2020).