Last interglacial (MIS 5e) surface water conditions at the Vøring Plateau (Norwegian Sea), based on dinoflagellate cysts.

Van Nieuwenhove, Nicolas and Bauch, Henning (2008) Last interglacial (MIS 5e) surface water conditions at the Vøring Plateau (Norwegian Sea), based on dinoflagellate cysts. Open Access Polar Research, 27 (1). pp. 75-186. DOI 10.3402/polar.v27i2.6175.

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Abstract

Sediments from the last interglacial, marine isotope stage 5e (MIS 5e), have
been studied for their dinoflagellate cyst content in a core retrieved from the
Vøring Plateau, Norwegian Sea. Qualitative and quantitative analyses of the
data, and comparison with the surface sample and published Holocene data
from the core, reveal distinct differences in hydrological surface conditions
between the late Holocene and MIS 5e. A higher number of co-dominant,
subordinate species in the last interglacial samples suggests there was a more
pronounced seasonality of the surface water at this time. This is supported by
the significant presence of Bitectatodinium tepikiense, a species that was virtually
absent from the area for most of the Holocene. The seasonality signal is further
substantiated by transfer-function reconstructions, which also indicates a
stronger stratification of the upper water column during MIS 5e. Moreover, the
assemblage data clearly show that optimal, fully marine interglacial conditions
prevailed only late in MIS 5e (between ca. 117.5 and 116.5 Kya), which is in
contrast with the climatic optimum early in the Holocene. Stable oxygen
isotope values from planktic foraminifera for this MIS 5e optimum are comparable
with the average Holocene values, but are generally ca. 0.3‰ higher than
those of the earlier part of the last interglacial (sensu stricto). These higher d18O
values are likely to be the result of the enhanced and prolonged influence of
Saalian deglacial meltwater, thus corroborating the existence of a quite differently
structured sea surface, as suggested by the dinocyst data.

Document Type: Article
Keywords: dinoflagellate cysts, Holocene, Last interglacial, marine isotope stage 53, transfer functions
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3402/polar.v27i2.6175
ISSN: 0800-0395
Date Deposited: 03 Dec 2008 16:52
Last Modified: 03 Jul 2019 10:07
URI: http://oceanrep.geomar.de/id/eprint/6183

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