DOI: 10.1016/j.quascirev.2014.04.027
Scopus记录号: 2-s2.0-85027922070
论文题名: Pelagic-benthic coupling within an upwelling system of the subtropical northeast Atlantic over the last 35kaBP
作者: McKay C.L. ; Filipsson H.L. ; Romero O.E. ; Stuut J.-B.W. ; Donner B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 106 起始页码: 299
结束页码: 315
语种: 英语
英文关键词: Benthic foraminifera
; Palaeoproductivity
; Pelagic-benthic
; Subtropical NE Atlantic
; Upwelling
Scopus关键词: Animals
; Coastal engineering
; Photosynthesis
; Phytoplankton
; Sea level
; Stratigraphy
; Submarine geology
; Tropics
; Benthic foraminifera
; Ne atlantic
; Palaeoproductivity
; Pelagic-benthic
; Upwelling
; Glacial geology
; benthic foraminifera
; community composition
; deep water
; Holocene
; nutrient availability
; pelagic ecosystem
; primary production
; radiocarbon dating
; subtropical region
; surface water
; upwelling
; Younger Dryas
; Atlantic Ocean
; Foraminifera
英文摘要: We present a high resolution, multiproxy study of the relationship between pelagic and benthic environments of a coastal upwelling system in the subtropical NE Atlantic Ocean. Marine sediments corresponding to late MIS3 to the Holocene in the radiocarbon dated core GeoB7926, retrieved off Mauritania (21°N) were analysed to reconstruct productivity in surface waters and its linkage to deep waters during the last 35kaBP. High latitude cold events and changes in atmospheric and oceanographic dynamics influenced upwelling intensity over this time period. Subsequently, this caused changes in primary productivity off this low-latitude coastal upwelling locality. The benthic foraminiferal fauna displays four main community shifts corresponding to fundamental climatic events, first of all during late MIS3 (35-28kaBP), secondly from 28 to 19kaBP (including Heinrich event 2 and the LGM), thirdly within Heinrich event 1, the Bølling Allerød and the Younger Dryas (18-11.5kaBP) and finally during the Holocene (11.5-0kaBP). In particular, strong pelagic-benthic coupling is apparent in MIS 3, as demonstrated by increased primary productivity, indicated by moderate DAR and the dominance of benthic foraminiferal species which prefer fresh phytodetritus. A decline in upwelling intensity and nutrient availability follows, which resulted in a proportionately larger amount of older, degraded matter, provoking a shift in the benthic foraminifera fauna composition. This rapid response of the benthic environment continues with a progressive increase in upwelling intensity due to sea level and oceanographic changes and according high surface production during the LGM. During Heinrich event 1 and the Younger Dryas, extreme levels of primary production actually hindered benthic environment through the development of low oxygen conditions. After this period, a final change in benthic foraminiferal community composition occurs which indicates a return to more oxygenated conditions during the Holocene. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60092
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, Lund University, Sölvegatan 12, Lund, Sweden; MARUM - Center for Marine Environmental Sciences, Universität Bremen, Leobener Strasse, Bremen, Germany; NIOZ - Royal Netherlands Institute for Sea Research, Marine Geology Department, P.O. Box 59, Den Burg, Netherlands
Recommended Citation:
McKay C.L.,Filipsson H.L.,Romero O.E.,et al. Pelagic-benthic coupling within an upwelling system of the subtropical northeast Atlantic over the last 35kaBP[J]. Quaternary Science Reviews,2014-01-01,106