HR: 1340h
AN: PP13A-0584 [Abstracts]
TI: Major Hydrologic Shift around 7-8 ka and Cyclic Events during the Holocene in the Northeastern
Atlantic (52N, 21W)
AU: * GROUSSET, F
EM: f.grousset@epoc.u-bordeaux1.fr
AF: CNRS UMR 5805 EPOC, Universite Bordeaux I, Avenue des Facultes, Talence, 33405
France
AU: PUJOL, C
EM: c.pujol@epoc.u-bordeaux1.fr
AF: CNRS UMR 5805 EPOC, Universite Bordeaux I, Avenue des Facultes, Talence, 33405
France
AU: DUPRAT, J
EM: j.duprat@epoc.u-bordeaux1.fr
AF: CNRS UMR 5805 EPOC, Universite Bordeaux I, Avenue des Facultes, Talence, 33405
France
AU: GRELAUD, M
EM: m.grelaud@epoc.u-bordeaux1.fr
AF: CNRS UMR 5805 EPOC, Universite Bordeaux I, Avenue des Facultes, Talence, 33405
France
AB:
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.
DE: 9325 Atlantic Ocean
DE: 4870 Stable isotopes
DE: 4267 Paleoceanography
DE: 4532 General circulation
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting