DOI: 10.1016/j.quascirev.2015.04.002
Scopus记录号: 2-s2.0-84929103481
论文题名: Oceanographic variability on the West Antarctic Peninsula during the Holocene and the influence of upper circumpolar deep water
作者: Peck V.L. ; Allen C.S. ; Kender S. ; McClymont E.L. ; Hodgson D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 119 起始页码: 54
结束页码: 65
语种: 英语
英文关键词: Antarctic
; Holocene
; Paleoceanography
; Southern Hemisphere Westerly Winds
Scopus关键词: Glacial geology
; Melting
; Oceanography
; Sea ice
; Antarctic
; Holocenes
; Long-term relationships
; Oceanographic variability
; Paleoceanography
; Upper Circumpolar Deep Water
; West antarctic ice sheets
; Westerly winds
; Ice
; circumpolar current
; continental shelf
; deep water
; deglaciation
; diatom
; El Nino-Southern Oscillation
; foraminifera
; Holocene
; paleoceanography
; primary production
; reconstruction
; sea ice
; sedimentology
; westerly
; Antarctic Peninsula
; Antarctica
; Marguerite Bay
; West Antarctica
; Bacillariophyta
英文摘要: Recent intensification of wind-driven upwelling of warm upper circumpolar deep water (UCDW) has been linked to accelerated melting of West Antarctic ice shelves and glaciers. To better assess the long term relationship between UCDW upwelling and the stability of the West Antarctic Ice Sheet, we present a multi-proxy reconstruction of surface and bottom water conditions in Marguerite Bay, West Antarctic Peninsula (WAP), through the Holocene. A combination of sedimentological, diatom and foraminiferal records are, for the first time, presented together to infer a decline in UCDW influence within Marguerite Bay through the early to mid Holocene and the dominance of cyclic forcing in the late Holocene. Extensive glacial melt, limited sea ice and enhanced primary productivity between 9.7 and 7.0ka BP is considered to be most consistent with persistent incursions of UCDW through Marguerite Trough. From 7.0ka BP sea ice seasons increased and productivity decreased, suggesting that UCDW influence within Marguerite Bay waned, coincident with the equatorward migration of the Southern Hemisphere Westerly Winds (SWW). UCDW influence continued through the mid Holocene, and by 4.2ka BP lengthy sea ice seasons persisted within Marguerite Bay. Intermittent melting and reforming of this sea ice within the late Holocene may be indicative of episodic incursions of UCDW into Marguerite Bay during this period. The cyclical changes in the oceanography within Marguerite Bay during the late Holocene is consistent with enhanced sensitively to ENSO forcing as opposed to the SWW-forcing that appears to have dominated the early to mid Holocene. Current measurements of the oceanography of the WAP continental shelf suggest that the system has now returned to the early Holocene-like oceanographic configuration reported here, which in both cases has been associated with rapid deglaciation. © 2015 Published by Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60060
Appears in Collections: 过去全球变化的重建
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作者单位: British Antarctic Survey, High Cross, Madingley Rd, Cambridge, United Kingdom; University of Nottingham, School of Geography, Nottingham, United Kingdom; British Geological Survey, Keyworth, Nottingham, United Kingdom; Durham University, Department of Geography, South Road, Durham, United Kingdom
Recommended Citation:
Peck V.L.,Allen C.S.,Kender S.,et al. Oceanographic variability on the West Antarctic Peninsula during the Holocene and the influence of upper circumpolar deep water[J]. Quaternary Science Reviews,2015-01-01,119