Major Hydrologic Shift around 7-8 ka and Cyclic Events during the Holocene in the Northeastern Atlantic (52N, 21W)
Abstract
The study of a box-core (SU90-I-10) located in the northeastern Atlantic Ocean (52N, 21W) in the North Atlantic Drift pathway (East Thulean seamount), reveals a quite stable Holocene climate, contrasting with the usual cooling observed around 6ka at more northern latitudes. On the contrary, a clear temperature jump (about + 2 degrees) is identified around 6.6-7.8 ka. It could be related to an intensification of the Northward penetration of the surface currents (North Atlantic Drift), which could have influenced the central western Europe climate, where a similar behavior has already been observed at the same time. Seasonnal contrasts were intensified after this main hydrological shift, especially during the summer seasons. The typical 1-2 ky cooling events already observed elsewhere through the Holocene, in the northeastern Atlantic are clearly recorded too. Finally, the tephra abundance increased according to a shorter cyclicity (about 1 ky ): these Icelandic-derived inputs coming from the northern Atlantic regions could reflect cyclic phases of intensified southward sea-ice transport, that could be linked to the solar activity variability.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2004
- Bibcode:
- 2004AGUFMPP13A0584G
- Keywords:
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- 9325 Atlantic Ocean;
- 4870 Stable isotopes;
- 4267 Paleoceanography;
- 4532 General circulation