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The mid- to late Holocene paleoceanographic changes
in the northern North Atlantic |
| RAN Lihua1, JIANG Hui2, KNUDSEN Karen Luise3, EIRĺKSSON Jón4 |
| 1.The Key Laboratory of Geographic Information Science, East China Normal University；The Second Institute of Oceanography, SOA; 2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University; 3.Department of Earth Sciences, University of Aarhus; 4.Earth Science Institute, University of Iceland, Askja; |
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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 ?18O record from the GISP2 and is generally consistent with other SST records based on diatom on the North Icelandic shelf.
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Issue Date: 05 December 2008
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