DOI: 10.1016/j.quascirev.2017.07.003
论文题名: A late Quaternary record of seasonal sea surface temperatures off southern Africa
作者: Loftus E. ; Sealy J. ; Leng M.J. ; Lee-Thorp J.A.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 171 起始页码: 73
结束页码: 84
语种: 英语
英文关键词: Agulhas Current
; Holocene
; Late Pleistocene
; Mollusc shells
; Oxygen isotopes
; Palaeoclimatology
; Southern Africa
; Westerly winds
Scopus关键词: Digital storage
; Dynamics
; Molluscs
; Precipitation (meteorology)
; Rain
; Submarine geology
; Agulhas current
; Holocenes
; Late Pleistocene
; Mollusc shells
; Oxygen isotopes
; Palaeoclimatology
; Southern Africa
; Westerly winds
; Oceanography
; easterly wave
; global climate
; historical record
; Holocene
; mollusc
; oxygen isotope
; paleoclimate
; Pleistocene
; sea surface temperature
; sediment core
; shell
; upwelling
; westerly
; western boundary current
; wind
; Agulhas Current
; Indian Ocean
; Southern Africa
; Gastropoda
; Mollusca
; Turbo sarmaticus
英文摘要: The southern Cape coastal region is important for understanding both the behavioural history of modern humans, and regional and global climate dynamics, because it boasts a long archaeological record and occupies a key geographical location near the intersection of two major oceans. The western boundary Agulhas Current, implicated in global heat exchange dynamics, is an important modulator of southern African climates and yet we understand its past behaviour only broadly as the Current itself scours the coastal shelf and marine sediment core records necessarily provide little detail. Numerous archaeological sites from both the late Pleistocene and Holocene provide the opportunity for reconstruction of near-shore seasonal SST records, which respond both to localized wind-driven upwellings and Agulhas temperature shifts, corresponding in turn with terrestrial precipitation trends in the near-coastal and summer rainfall regions. Here we present a record of seasonal SSTs extending over MIS5, MIS4, and the Holocene, from serial δ18O measurements of a single gastropod species, Turbo sarmaticus. The results show that mean SST shifts accord well with global SST trends, although they are larger than those recorded in the Agulhas Current from coarser-scale marine sediment records. Comparison with a record of Antarctic sea-ice suggests that annual SST amplitude responds to Antarctic sea-ice extent, reflecting the positioning of the regional wind systems that drive upwelling dynamics along the coast. Thus, near-shore SST seasonality reflects the relative dominance of the westerly and easterly wind systems. These data provide a new climate archive for an important but understudied climate system. © 2017 Elsevier Ltd 资助项目: Loftus, E.
; Research Laboratory for Archaeology and the History of Art, University of Oxford, 1-2 South Parks Road, United Kingdom
; 电子邮件: emma.loftus@rlaha.ox.ac.uk
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59134
Appears in Collections: 过去全球变化的重建
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作者单位: Research Laboratory for Archaeology and the History of Art, University of Oxford, 1-2 South Parks Road, Oxford, United Kingdom; Department of Archaeology, University of Cape Town, Private Bag X3, Rondebosch, South Africa; NERC Isotope Geosciences Facilities, British Geological Survey, Keyworth, Nottingham, United Kingdom; Centre for Environmental Geochemistry, School of Geography, University of Nottingham, Nottingham, United Kingdom
Recommended Citation:
Loftus E.,Sealy J.,Leng M.J.,et al. A late Quaternary record of seasonal sea surface temperatures off southern Africa[J]. Quaternary Science Reviews,2017-01-01,171