HR: 0800h
AN: PP11B-1457    [Abstracts]
TI: The Paleoceanographic Development of the Last two Millennia in the Arctic, Evidence From Hinlopen Strait, Northern Svalbard
AU: Koc, N
EM: nalan@npolar.no
AF: Norwegian Polarinstitute, Polar Environmentalcentre, Tromsoe, 9296 Norway
AU: * Klitgaard-Kristensen, D
EM: dorthe@npolar.no
AF: Norwegian Polarinstitute, Polar Environmentalcentre, Tromsoe, 9296 Norway
AB: Detailed reconstructions of the paleoceanographic development in the Arctic during the Holocene are still poorly constrained in terms of the variability of the advection of Atlantic Water. Owing to the Atlantic Water as a major regulator of the climate and environmental changes in the Arctic it is important to investigate how this has changed spatially and temporally. In order to resolve the paleoceanographic development of the last two millennia in great detail we have investigated sediment cores (NP94-51) from a high accumulation area on the continental shelf, i.e. the Hinlopen Strait. This site has been chosen due to its present location within the inflow of Atlantic Water into the Arctic Ocean. The cores investigated are one box core and a gravity core. The composite record consists of c. 125 cm, yielding a time resolution between 10-30 years for the last 2 Ka. The age model is based on seven radiocarbon dates. The paleoceanographic reconstructions are inferred from the content of benthic and planktic foraminifera and IRD. Our main results show two periods from c. 1100-1350 AD and from c. 300-700 AD when the sea ice edge exert less influence at the site based on the occurrence of N. labradorica and the IRD content was generally high. From 1350-1800 AD the coldest conditions are inferred from lower content of IRD and a close location of the sea ice edge. The timing of these changes will be discussed in the light of those found further south in the Nordic Seas through the last two millennia
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1635 Oceans (1616, 3305, 4215, 4513)
DE: 4944 Micropaleontology (0459, 3030)
DE: 4950 Paleoecology
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005