DOI: 10.1016/j.gloplacha.2013.03.007
论文题名: Low- to high-productivity pattern within Heinrich Stadial 1: Inferences from dinoflagellate cyst records off Senegal
作者: Bouimetarhan I. ; Groeneveld J. ; Dupont L. ; Zonneveld K.
刊名: Global and Planetary Change
ISSN: 0921-8289
出版年: 2013
卷: 106 起始页码: 64
结束页码: 76
语种: 英语
英文关键词: Dinoflagellate cysts
; Heinrich Stadial 1
; Marine productivity
; NE trade winds
; Senegal
; Two-phase pattern
; Upwelling
Scopus关键词: Dinoflagellate cysts
; Heinrich Stadial 1
; Marine productivity
; Senegal
; Trade winds
; Two-phase pattern
; Upwelling
; Atmospheric temperature
; Commerce
; Isotopes
; Oceanography
; Submarine geology
; Productivity
; dinoflagellate
; geochemistry
; hydrographic survey
; marine sediment
; parameterization
; primary production
; sea surface temperature
; sediment core
; trade wind
; upwelling
; Sahel [Sub-Saharan Africa]
; Senegal
; West Africa
; Dinophyceae
英文摘要: In order to investigate a possible connection between tropical northeast (NE) Atlantic primary productivity, Atlantic meridional overturning circulation (AMOC), and drought in the Sahel region during Heinrich Stadial 1 (HS1), we used dinoflagellate cyst (dinocyst) assemblages, Mg/Ca based reconstructed temperatures, stable carbon isotopes (δ13C) and geochemical parameters of a marine sediment core (GeoB 9508-5) from the continental slope offshore Senegal. Our results show a two-phase productivity pattern within HS1 that progressed from an interval of low marine productivity between ~19 and 16kyr BP to a phase with an abrupt and large productivity increase from ~16 to 15kyr BP. The second phase is characterized by distinct heavy planktonic δ13C values and high concentrations of heterotrophic dinocysts in addition to a significant cooling signal based on the reconstructions of past sea surface temperatures (SSTs). We conclude that productivity variations within HS1 can be attributed to a substantial shift of West African atmospheric processes. Taken together our results indicate a significant intensification of the North East (NE) trade winds over West Africa leading to more intense upwelling during the last millennium of HS1 between ~16 and 15kyr BP, thus leaving a strong imprint on the dinocyst assemblages and sea surface conditions. Therefore, the two-phase productivity pattern indicates a complex hydrographic setting suggesting that HS1 cannot be regarded as uniform as previously thought. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876434161&doi=10.1016%2fj.gloplacha.2013.03.007&partnerID=40&md5=ac8fa27f429eae86e28d5aadb3670bdf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11195
Appears in Collections: 全球变化的国际研究计划
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作者单位: MARUM - Centre for Marine Environmental Sciences and Department of Geosciences, University of Bremen, Po Box 330 440, D-28334, Bremen, Germany
Recommended Citation:
Bouimetarhan I.,Groeneveld J.,Dupont L.,et al. Low- to high-productivity pattern within Heinrich Stadial 1: Inferences from dinoflagellate cyst records off Senegal[J]. Global and Planetary Change,2013-01-01,106.