DOI: 10.1016/j.quascirev.2013.09.021
Scopus记录号: 2-s2.0-84885803701
论文题名: A coccolithophore based view on paleoenvironmental changes in the open ocean mid-latitude North Atlantic between 130 and 48ka BP with special emphasis on MIS 5e
作者: Schwab C. ; Kinkel H. ; Weinelt M. ; Repschläger J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 81 起始页码: 35
结束页码: 47
语种: 英语
英文关键词: Coccolithophores
; MIS 5.5
; Paleoceanography
; Paleoproductivity
Scopus关键词: Coccolithophores
; Environmental conditions
; High resolution analysis
; North Atlantic subtropical gyres
; Paleoceanography
; Paleoenvironmental change
; Paleoproductivity
; Subantarctic mode water
; Climate change
; Glacial geology
; Isotopes
; Phytoplankton
; Productivity
; Sediments
; Oceanography
; climate variation
; coccolith
; depositional environment
; diatom
; dominance
; global climate
; gyre
; hydrography
; marine isotope stage
; open ocean
; paleoceanography
; paleoclimate
; paleoecology
; paleoenvironment
; paleoproductivity
; sediment core
; Atlantic Ocean
; Atlantic Ocean (North)
; Azores Current
英文摘要: As oceanographic changes in the North Atlantic are known to modulate global climate, they are key to the understanding of past and future climate changes. Especially the mid-latitudes of the open ocean North Atlantic may be of interest, regarding the large area covered. We therefore reconstructed past changes in productivity and hydrography from a new sediment core (MD08-3179Cq) taken in the open ocean mid-latitude North Atlantic in the vicinity of the Azores Current System. Concomitant to the reorganizations of environmental conditions in the North Atlantic between 130 and 48ka BP, changes in coccolithophore assemblages and changes in the abundance of siliceous plankton (diatoms) indicate a southward shift of the Azores Front (AzF), and hence a southward retreat of the North Atlantic subtropical gyre, as well as an increased productivity, during glacial Marine Isotope Stage (MIS) 4, Termination II and during cold substages of MIS 5. Furthermore we hypothesize that the ecological changes led to distinct evolutionary patterns of coccolithophores, resulting e.g. in a dominance of Gephyrocapsa ornata between 76 and 105ka BP. Additionally, high-resolution analysis of MIS 5e indicate a short reversal towards cool conditions during MIS 5e, corresponding to a basin-wide cooling event. Full interglacial conditions are reached only late in the Azores region. During MIS 5e an increased advection of Subantarctic Mode Water (SAMW), and/or the possibility to occupy new habitats after glacial conditions, result in a distinct coccolithophore productivity peak. As global temperature during MIS 5e are assumed to be similar to the expected future global climate change, MIS 5e serves as a possible scenario for future changes. Taking MIS 5e as a possible analogue for expected future climate change, our results indicate that an expected decrease in marine primary productivity, due to the expansion of the oligotrophic gyres, may be attenuated by increased coccolithophore productivity.© 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60452
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Geosciences, Christian-Albrechts-Universität Kiel, Ludewig-Meyn-Strasse 10, 24118 Kiel, Germany; Graduate School Human Development in Landscapes, Christian-Albrechts-Universität Kiel, Leibnizstrasse 3, 24118 Kiel, Germany; Institute of Pre- and Protohistoric Archaeology, Christian-Albrechts-Universität Kiel, Johanna-Mestorf Strasse 2-6, 24118 Kiel, Germany
Recommended Citation:
Schwab C.,Kinkel H.,Weinelt M.,et al. A coccolithophore based view on paleoenvironmental changes in the open ocean mid-latitude North Atlantic between 130 and 48ka BP with special emphasis on MIS 5e[J]. Quaternary Science Reviews,2013-01-01,81