Land-ocean changes on orbital and millennial time scales and the penultimate glaciation
|Author(s)||Margari Vasiliki1, Skinner Luke C.2, Hodell David A.2, Martrat Belen3, Toucanne Samuel4, Grimalt Joan O.3, Gibbard Philip L.5, Lunkka J. P.6, Tzedakis P. C.1|
|Affiliation(s)||1 : UCL, Dept Geog, Environm Change Res Ctr, London WC1E 6BT, England.
2 : Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England.
3 : Spanish Council Sci Res CSIC, Inst Environm Assessment & Water Res IDAEA, Barcelona 08034, Spain.
4 : IFREMER, Lab Environm Sedimentaires, F-29280 Plouzane, France.
5 : Univ Cambridge, Dept Geog, Cambridge CB2 3EN, England.
6 : Univ Oulu, Inst Geosci, FIN-90014 Oulu, Finland.
|Source||Geology (0091-7613) (Geological Soc Amer, Inc), 2014-03 , Vol. 42 , N. 3 , P. 183-186|
|WOS© Times Cited||54|
|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.|