globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2013.11.003
Scopus记录号: 2-s2.0-84888353641
论文题名:
A 550ka record of aeolian activity near north west cape, australia: Inferences from grain-size distributions and bulk chemistry of SE indian ocean deep-sea sediments
作者: Stuut J.B.W.; Temmesfeld F.; De Deckker P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 83
起始页码: 83
结束页码: 94
语种: 英语
英文关键词: Aeolian dust ; End-member modelling ; Grain size ; Monsoon ; Ti/Ca ; XRF scan ; Zr/Fe
Scopus关键词: Climatology ; Size distribution ; Aeolian dusts ; End-member modelling ; Grain size ; Monsoon ; XRF scan ; Sediments ; alluvial deposit ; aridity ; calcium ; climate variation ; continental slope ; deep-sea sediment ; dust ; eolian process ; glacial-interglacial cycle ; grain size ; interglacial ; iron ; paleoenvironment ; sediment core ; size distribution ; titanium ; X-ray fluorescence ; zirconium ; Australia ; Chile ; Indian Ocean ; Indian Ocean (Southeast) ; Namibia ; Western Australia
英文摘要: The terrigenous fraction of sediments from a deep-sea sediment core recovered from the northwestern Western Australian continental slope offshore North West Cape, SE Indian Ocean, reveals a history of Western Australian climate throughout the last 550ka. End-member modelling of a data set of grain-size distributions (n=438) of the terrigenous sediment fraction allows to interpret the record in terms of aeolian and fluvial sediment deposition, both related to palaeo-environmental conditions in the North West Cape area. The data set can be best described by two aeolian end members and one fluvial one. Changes in the ratio of the two aeolian end members over the fluvial one are interpreted as aridity variations in northwestern Western Australia. These grain-size data are compared with bulk geochemical data obtained by XRF scans of the core. Log-ratios of the elements Zr/Fe and Ti/Ca, which indicate a terrigenous origin, corroborate the grain-size data. We postulate that the mid- to late Quaternary near North West Cape climate was relatively arid during the glacial and relatively humid during the interglacial stages, owing to meridional shifts in the atmospheric circulation system. Opposite to published palaeo-environmental records from the same latitude (20°S) offshore Chile and offshore Namibia, the Australian aridity record does not show the typical southern hemisphere climate variability of humid glacials and dry interglacials, which we interpret to be the result of the relatively large land mass of the Australian continent, which emphasises a strong monsoonal climatic system. © 2013 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60414
Appears in Collections:过去全球变化的重建

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作者单位: NIOZ - Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Netherlands; MARUM - Center for Marine Environmental Sciences, Bremen University, 28359 Bremen, Germany; Research School of Earth Sciences, The Australian National University, Canberra ACT 0200, Australia

Recommended Citation:
Stuut J.B.W.,Temmesfeld F.,De Deckker P.. A 550ka record of aeolian activity near north west cape, australia: Inferences from grain-size distributions and bulk chemistry of SE indian ocean deep-sea sediments[J]. Quaternary Science Reviews,2014-01-01,83
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