干旱区生态环境知识资源中心(Arid): Late Quaternary climate variability at Mfabeni peatland, eastern South Africa

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DOI	10.5194/cp-15-1153-2019
	Late Quaternary climate variability at Mfabeni peatland, eastern South Africa
	Miller, Charlotte 1; Finch, Jemma 2; Hill, Trevor 2; Peterse, Francien 3; Humphries, Marc 4; Zabel, Matthias 1; Schefuss, Enno 1
通讯作者	Miller, Charlotte
来源期刊	CLIMATE OF THE PAST
ISSN	1814-9324
EISSN	1814-9332
出版年	2019
卷号	15 期号:3 页码:1153-1170
英文摘要	The scarcity of continuous, terrestrial, palaeoenvironmental records in eastern South Africa leaves the evolution of late Quaternary climate and its driving mechanisms uncertain. Here we use a similar to 7m long core from Mfabeni peatland (KwaZulu-Natal, South Africa) to reconstruct climate variability for the last 32 000 years (cal ka BP). We infer past vegetation and hydrological variability using stable carbon (delta C-13(wax)) and hydrogen isotopes (delta D-wax) of plant-wax n-alkanes and use P-aq to reconstruct water table changes. Our results indicate that late Quaternary climate in eastern South Africa did not respond directly to orbital forcing or to changes in sea-surface temperatures (SSTs) in the western Indian Ocean. We attribute the arid conditions evidenced at Mfabeni during the Last Glacial Maximum (LGM) to low SSTs and an equatorward displacement of (i) the Southern Hemisphere westerlies, (ii) the subtropical high-pressure cell, and (iii) the South Indian Ocean Convergence Zone (SIOCZ), which we infer was linked to increased Antarctic sea-ice extent. The northerly location of the high-pressure cell and the SIOCZ inhibited moisture advection inland and pushed the rain-bearing cloud band north of Mfabeni, respectively. The increased humidity at Mfabeni between 19 and 14 cal kyr BP likely resulted from a southward retreat of the westerlies, the high-pressure cell, and the SIOCZ, consistent with a decrease in Antarctic sea-ice extent. Between 14 and 5 cal kyr BP, when the westerlies, the high-pressure cell, and the SIOCZ were in their southernmost position, local insolation became the dominant control, leading to stronger atmospheric convection and an enhanced tropical easterly monsoon. Generally drier conditions persisted during the past ca. 5 cal ka BP, probably resulting from an equatorward return of the westerlies, the high-pressure cell, and the SIOCZ. Higher SSTs and heightened El Nino-Southern Oscillation (ENSO) activity may have played a role in enhancing climatic variability during the past ca. 5 cal ka BP. Our findings highlight the influence of the latitudinal position of the westerlies, the high-pressure cell, and the SIOCZ in driving climatological and environmental changes in eastern South Africa.
类型	Article
语种	英语
国家	Germany ; South Africa ; Netherlands
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000473069500001
WOS关键词	LAST GLACIAL MAXIMUM ; HYDROGEN-ISOTOPIC COMPOSITION ; TROPICAL-TEMPERATE TROUGHS ; INDIAN CONVERGENCE ZONE ; ANTARCTIC SEA-ICE ; SAVANNA BIOME ; EL-NINO ; ATMOSPHERIC CIRCULATION ; RAINFALL VARIABILITY ; VEGETATION HISTORY
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214920
作者单位	1.Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen, Germany; 2.Univ KwaZulu Natal, Sch Agr Earth & Environm Sci, Pietermaritzburg, South Africa; 3.Univ Utrecht, Dept Earth Sci, Utrecht, Netherlands; 4.Univ Witwatersrand, Sch Chem, Mol Sci Inst, Johannesburg, South Africa
推荐引用方式 GB/T 7714	Miller, Charlotte,Finch, Jemma,Hill, Trevor,et al. Late Quaternary climate variability at Mfabeni peatland, eastern South Africa[J],2019,15(3):1153-1170.
APA	Miller, Charlotte.,Finch, Jemma.,Hill, Trevor.,Peterse, Francien.,Humphries, Marc.,...&Schefuss, Enno.(2019).Late Quaternary climate variability at Mfabeni peatland, eastern South Africa.CLIMATE OF THE PAST,15(3),1153-1170.
MLA	Miller, Charlotte,et al."Late Quaternary climate variability at Mfabeni peatland, eastern South Africa".CLIMATE OF THE PAST 15.3(2019):1153-1170.