globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.03.054
Scopus记录号: 2-s2.0-85045123069
论文题名:
Oceanographic and climatic evolution of the southeastern subtropical Atlantic over the last 3.5 Ma
作者: Petrick B.; McClymont E.L.; Littler K.; Rosell-Melé A.; Clarkson M.O.; Maslin M.; Röhl U.; Shevenell A.E.; Pancost R.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492
起始页码: 12
结束页码: 21
语种: 英语
英文关键词: Aguhlas Leakage ; Benguela Upwelling ; EMPT ; Plio–Plistocene
Scopus关键词: Climate change ; Glacial geology ; Submarine geology ; Surface waters ; Benguela ; Benguela upwelling systems ; Early-mid pleistocene ; EMPT ; Mass accumulation rates ; Northern hemisphere glaciations ; Nutrient availability ; Sea surface temperature (SST) ; Oceanography ; climate variation ; marine sediment ; paleoceanography ; Pleistocene ; Pliocene ; primary production ; sea surface temperature ; upwelling ; western boundary current ; Atlantic Ocean ; Atlantic Ocean (Southeast) ; Southern Africa
英文摘要: The southeast Atlantic Ocean is dominated by two major oceanic systems: the Benguela Upwelling System, one of the world's most productive coastal upwelling cells and the Agulhas Leakage, which is important for transferring warm salty water from the Indian Ocean to the Atlantic Ocean. Here, we present a multi-proxy record of marine sediments from ODP Site 1087. We reconstruct sea surface temperatures (U37 K′ and TEX86 indices), marine primary productivity (total chlorin and alkenone mass accumulation rates), and terrestrial inputs derived from southern Africa (Ti/Al and Ca/Ti via XRF scanning) to understand the evolution of the Southeast Atlantic Ocean since the late Pliocene. In the late Pliocene and early Pleistocene, ODP Site 1087 was situated within the Benguela Upwelling System, which was displaced southwards relative to present. We recognize a series of events in the proxy records at 3.3, 3.0, 2.2, 1.5, 0.9 and 0.6 Ma, which are interpreted to reflect a combination of changes in the location of major global wind and oceanic systems and local variations in the strength and/or position of the winds, which influence nutrient availability. Although there is a temporary SST cooling observed around the initiation of Northern Hemisphere glaciation (iNHG), proxy records from ODP Site 1087 show no clear climatic transition around 2.7 Ma but instead most of the changes occur before this time. This observation is significant because it has been previously suggested that there should be a change in the location and/or strength of upwelling associated with this climate transition. Rather, the main shifts at ODP Site 1087 occur at ca. 0.9 Ma and 0.6 Ma, associated with the early mid-Pleistocene transition (EMPT), with a clear loss of the previous upwelling-dominated regime. This observation raises the possibility that reorganisation of southeast Atlantic Ocean circulation towards modern conditions was tightly linked to the EMPT, but not to earlier climate transitions. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109906
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Max Planck Institute of Chemistry, Climate Geochemistry Department, Hahn-Meitner-Weg 1, Mainz, 55128, Germany; Department of Geography, Newcastle University, United Kingdom; Department of Geography, Durham University, South Road, Durham, DH1 3LE, United Kingdom; Camborne School of Mines, Environment and Sustainability Institute, University of Exeter, United Kingdom; Institute of Environmental Science and Technology, Autonomous University of Barcelona, Campus de la UAB, Bellaterra (Cerdanyola del Vallès), Barcelona, 08193, Spain; Institució Catalana de Recerca i Estudis Avançats, Barcelona, Catalonia 08010, Spain; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH, Zurich, 8092, Switzerland; Department of Geography, University College London, Pearson Building, Gower Street, London, WC1E 6BT, United Kingdom; MARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Str. 8, Bremen, 28359, Germany; College of Marine Science, University of South Florida, St. Petersburg, FL 33701, United States; University of Bristol, School of Chemistry, Cantock's Close, Bristol, BS8 1TS, United Kingdom

Recommended Citation:
Petrick B.,McClymont E.L.,Littler K.,et al. Oceanographic and climatic evolution of the southeastern subtropical Atlantic over the last 3.5 Ma[J]. Earth and Planetary Science Letters,2018-01-01,492
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