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Land-ocean changes on orbital and millennial time scales and the penultimate glaciation

Margari, V; Skinner, LC; Hodell, DA; Martrat, B; Toucanne, S; Grimalt, JO; Gibbard, PL; ... Tzedakis, PC; + view all (2014) Land-ocean changes on orbital and millennial time scales and the penultimate glaciation. GEOLOGY , 42 (3) 183 - 186. 10.1130/G35070.1. Green open access

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Abstract

Past glacials can be thought of as natural experiments in which variations in boundary conditions influenced the character of climate change. However, beyond the last glacial, an integrated view of orbital- and millennial-scale changes and their relation to the record of glaciation has been lacking. Here, we present a detailed record of variations in the land-ocean system from the Portuguese margin during the penultimate glacial and place it within the framework of ice-volume changes, with particular reference to European ice-sheet dynamics. The interaction of orbital- and millennial-scale variability divides the glacial into an early part with warmer and wetter overall conditions and prominent climate oscillations, a transitional mid-part, and a late part with more subdued changes as the system entered a maximum glacial state. The most extreme event occurred in the mid-part and was associated with melting of the extensive European ice sheet and maximum discharge from the Fleuve Manche river. This led to disruption of the meridional overturning circulation, but not a major activation of the bipolar seesaw. In addition to stadial duration, magnitude of freshwater forcing, and background climate, the evidence also points to the influence of the location of freshwater discharges on the extent of interhemispheric heat transport.

Type: Article
Title: Land-ocean changes on orbital and millennial time scales and the penultimate glaciation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1130/G35070.1
Publisher version: http://dx.doi.org/10.1130/G35070.1
Additional information: © 2014 Geological Society of America. Gold Open Access: This paper is published under the terms of the CC-BY license.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/1427866
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