气候变化领域集成服务门户(CCPortal): Mid- and low latitude effects on eastern South African rainfall over the Holocene

CCPortal

DOI	10.1016/j.quascirev.2019.106088
	Mid- and low latitude effects on eastern South African rainfall over the Holocene
	Miller C.; Hahn A.; Liebrand D.; Zabel M.; Schefuß E.
发表日期	2020
ISSN	0277-3791
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 (C3/C4) 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. © 2019 Elsevier Ltd
英文关键词	Carbon isotopes; Eastern South Africa; Hydrogen isotopes; Insolation; n-alkanes; South indian ocean convergence zone; Southern hemisphere westerlies; Tropical easterlies; XRF analysis
语种	英语
scopus关键词	Catchments; Incident solar radiation; Isotopes; Oceanography; Offshore oil well production; Paraffins; Rain; Carbon isotopes; Convergence zones; Hydrogen isotope; n-Alkanes; South Africa; Southern Hemisphere; Tropical easterlies; XRF analysis; Climate change; alkane; aridity; carbon isotope; catchment; climate conditions; climate feedback; climate forcing; climate variation; Holocene; hydrogen isotope; hydrological change; insolation; precipitation (climatology); Quaternary; rainfall; sea surface temperature; seasonal variation; tropical region; X-ray fluorescence; Indian Ocean; Indian Ocean (South); Limpopo River; 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/151622
作者单位	MARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Str. 8, Bremen, 28359, Germany
推荐引用方式 GB/T 7714	Miller C.,Hahn A.,Liebrand D.,et al. Mid- and low latitude effects on eastern South African rainfall over the Holocene[J],2020,229.
APA	Miller C.,Hahn A.,Liebrand D.,Zabel M.,&Schefuß E..(2020).Mid- and low latitude effects on eastern South African rainfall over the Holocene.Quaternary Science Reviews,229.
MLA	Miller C.,et al."Mid- and low latitude effects on eastern South African rainfall over the Holocene".Quaternary Science Reviews 229(2020).