气候变化领域集成服务门户(CCPortal): The leaf wax biomarker record of a Namibian salt pan reveals enhanced summer rainfall during the Last Glacial-Interglacial Transition

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DOI	10.1016/j.palaeo.2019.109561
	The leaf wax biomarker record of a Namibian salt pan reveals enhanced summer rainfall during the Last Glacial-Interglacial Transition
	Belz L.; Schüller I.; Wehrmann A.; Köster J.; Wilkes H.
发表日期	2020
ISSN	0031-0182
卷号	543
英文摘要	Conventional continental geoarchives are rarely available in arid southern Africa. Therefore, palaeoclimate data in this area are still patchy and late Quaternary climate development is only poorly understood. In the western Kalahari, salt pans (playas, ephemeral lakes) are common and can feature quasi-continuous sedimentation. This study presents the first climate-related biomarker record using sediments from the Omongwa Pan, a Kalahari salt pan located in eastern Namibia. Our approach to reconstruct vegetation and hydrology focuses on biogeochemical bulk parameters and plant wax-derived lipid biomarkers (n-alkanes, n-alkanols, and fatty acids) and their compound-specific carbon and hydrogen isotopic compositions. The presented record reaches back to 27 ka. During the glacial, rather low δ2H values of n-alkanes and low sediment input exclude a strong influence of winter rainfall. n-Alkane and n-alkanol distributions and δ13C values of n-hentriacontane (n-C31) indicate a shift to a vegetation with a higher proportion of C4 plants at the end of the Last Glacial Maximum until the end of Heinrich Stadial I (ca. 18–14.8 ka), which we interpret to indicate an abrupt excursion to a short wetter period likely to be caused by a temporary southward shift of the Intertropical Convergence Zone. Shifts in δ2H values of n-C31 and plant wax parameters give evidence for changes to drier conditions during early Holocene. Comparison of this dataset with representative continental records from the region points to a major influence of summer rainfall at Omongwa Pan during the regarded time span and demonstrates the potential of southern African salt pans as archives for biomarker-based climate proxies. © 2020 Elsevier B.V.
英文关键词	Late Quaternary; n-Alkanes; n-Alkanols; Organic geochemistry; Palaeohydrology; Southern Africa
语种	英语
scopus关键词	alkene; biomarker; geochemistry; historical record; intertropical convergence zone; isotopic composition; Last Glacial Maximum; Last Glacial-Interglacial; leaf; organic compound; paleoclimate; paleoenvironment; paleohydrology; proxy climate record; Quaternary; rainfall; salt pan; summer; wax; Namibia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150584
作者单位	Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University, Oldenburg, 26111, Germany; Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, 14473, Germany; Senckenberg am Meer, Marine Research Department, Wilhelmshaven, 26382, Germany
推荐引用方式 GB/T 7714	Belz L.,Schüller I.,Wehrmann A.,et al. The leaf wax biomarker record of a Namibian salt pan reveals enhanced summer rainfall during the Last Glacial-Interglacial Transition[J],2020,543.
APA	Belz L.,Schüller I.,Wehrmann A.,Köster J.,&Wilkes H..(2020).The leaf wax biomarker record of a Namibian salt pan reveals enhanced summer rainfall during the Last Glacial-Interglacial Transition.Palaeogeography, Palaeoclimatology, Palaeoecology,543.
MLA	Belz L.,et al."The leaf wax biomarker record of a Namibian salt pan reveals enhanced summer rainfall during the Last Glacial-Interglacial Transition".Palaeogeography, Palaeoclimatology, Palaeoecology 543(2020).