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http://hdl.handle.net/1956/380
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| Title: | A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica |
| Authors: | Forsberg, C. F.
Løvlie, R.
Jansen, E.
Solheim, A.
Sejrup, H. P.
Lie, H. E. |
| Keywords: | Antarctic
Weddell Sea
Dronning Maud Land
palaeoceanography
stable isotopes
magnetostratigraphy |
| Issue Date: | 3-Mar-2003 |
| Publisher: | Elsevier |
| Citation: | Journal homepage http://www.sciencedirect.com/science/journal/00310182 |
| Series/Report no.: | Palaeogeography, Palaeoclimatology, Palaeoecology;198 |
| Abstract: | A 12.5 m long core was retrieved from the continental margin off Dronning Maud Land, Antarctica.
Magnetostratigraphy, stable isotopes, 14C accelerator mass spectrometer and amino acid analyses indicate a
continuous sediment record going back 1.3 Myr. Comparison of CaCO3 results with those from ODP Site 1089 and
an index of North Atlantic Deep Water (NADW) influence in surface waters indicate that NADW upwelled along the
Antarctic continental margin during the whole of this period. The mid-Pleistocene transition (1.0^0.6 Ma) was
accompanied by an apparent decline in the NADW influence, and was followed by extended carbonate dissolution
during the interglacials of marine isotope stages (MIS) 13 and 11. Less extensive periods of dissolution occur at the
end of the interglacials younger than MIS 11. While interglacial dissolution is characteristic of the Pacific and Indian
oceans, the carbon isotopes return to pre-transition values indicative of renewed NADW upwelling. The
concentration of ice-rafted debris may reflect changes in the relative rate of interglacial sedimentation. It is
speculated that the high ice rafted debris (IRD) concentrations during interglacials younger than 400 kyr may be due
to a reduced relative sedimentation rate of other interglacial components whereas the low concentrations during
interglacials before the mid-Pleistocene transition may be due to a higher relative sedimentation rate of these.
< 2003 Elsevier B.V. All rights reserved. |
| URI: | http://hdl.handle.net/1956/380 |
| ISSN: | 0031-0182 |
| Appears in Collections: | Bjerknes Center for Climate Research
|
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