The mid- to late Holocene paleoceanographic changes in the northern North Atlantic |
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| Authors: | Lihua RAN Hui JIANG Karen Luise KNUDSEN |
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| Institution: | (1) The Key Laboratory of Geographic Information Science, East China Normal University, Shanghai, 200062, China;(2) The Second Institute of Oceanography, SOA, Hangzhou, 310012, China;(3) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China;(4) Department of Earth Sciences, University of Aarhus, DK-8000 ?rhus C, Denmark;(5) Earth Science Institute, University of Iceland, Askja, S-101 Reykjavík, Iceland |
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| Abstract: | A high-resolution diatom record from core MD99-2275 shows a general paleoceanographic change in the northern North Atlantic
since 5000 cal. a B.P. by Principle Component Analysis. Sea surface temperature (SST) increased gradually during 5000 and
3000 cal. a B.P. on the North Icelandic shelf as a result of increasing influence of warm Atlantic water mass from the Irminger
Current. It apparently started to decrease since 3000 cal. a B.P. due to the weakening influence of warm water and enhanced
influence of the Polar and Arctic water masses from the East Greenland Current and the East Icelandic Current. Abrupt decreases
in SST and intrusions of Polar and Arctic water superimposed on the late Holocene cooling trend during 3000-2600, 1300-1000
and 600-200 cal. a B.P.. The paleoceanographic record revealed from core MD99-2275 corresponds well with δ18O record from the GISP2 and is generally consistent with other SST records based on diatom on the North Icelandic shelf.
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Translated from Marine Science Bulletin, 2008, 27(5) 译自:海洋通报] |
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| Keywords: | diatom Principle Component Analysis northern North Atlantic North Icelandic shelf mid-to late Holocene |
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