Per citar aquest document:
Scopus: 28 cites, Web of Science: 24 cites,
Millennial-scale surface and subsurface paleothermometry from the northeast Atlantic, 55–8 ka BP
Peck, V.L. (Cardiff University. School of Earth and Ocean Sciences)
Hall, Ian R. (Cardiff University. School of Earth and Ocean Sciences)
Zahn, Rainer (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Elderfield, Henry (University of Cambridge. Department of Earth Sciences)

Data: 2008
Resum: We present high-resolution records of upper ocean temperatures derived from Mg/Ca ratios of surface-dwelling Globigerina bulloides and subsurface-dwelling Neogloboquadrina pachyderma sinistral and the relative abundance of N. pachyderma sinistral for the period 55–8 ka BP from NE Atlantic sediment core MD01-2461. Millennial-scale temporal variability and longer-term trends in these records enable us to develop a detailed picture of past ocean conditions such as a weakening of thermocline intensity from marine isotope stage 3 (MIS 3) to the last glacial maximum (LGM). The correspondence of all temperature proxies and convergence of paired oxygen isotope (δ18O) records from both planktonic species implies a breakdown in the thermocline and year-round mixing of the upper water column through the LGM, perhaps related to decreasing insolation and additional cooling in association with the expansion of the circum–North Atlantic ice sheets. Millennial-scale divergence in surface and subsurface temperatures and δ18O across the last glacial correspond to meltwater release and the development of a strong halocline associated with both Heinrich (H) events and instabilities of the NW European ice sheet. During such episodes, G. bulloides Mg/Ca appears to record ambient, even warming summer sea surface temperatures across H events while the other proxies record maximum cooling.
Drets: Tots els drets reservats
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Publicat a: Paleoceanography, Vol. 23 Issue 3 (September 2008) , p. 3221, ISSN 1944-9186

DOI: 10.1029/2008PA001631

11 p, 489.0 KB

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 Registre creat el 2016-07-06, darrera modificació el 2016-07-15

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