Holocene sub-centennial evolution of Atlantic water inflow and sea ice distribution in the western Barents Sea

Type Article
Date 2014-01-23
Language English
Author(s) Berben S. M. P.1, Husum K.1, Cabedo-Sanz P.2, Belt S. T.2
Affiliation(s) 1 : Univ Tromso, Dept Geol, N-9037 Tromso, Norway.
2 : Univ Plymouth, Sch Geog Earth & Environm Sci, Biogeochem Res Ctr, Plymouth PL4 8AA, Devon, England.
Source Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2014-01-23 , Vol. 10 , N. 1 , P. 181-198
DOI 10.5194/cp-10-181-2014
WOS© Times Cited 39
Note Special issue The changing Arctic and Subarctic environment: proxy- and model-based reconstructions of Holocene climate variability in the northern North Atlantic
Abstract A marine sediment core (JM09-KA11-GC) from the Kveithola Trough at the western Barents Sea margin has been investigated in order to reconstruct sub-surface temperatures and sea ice distribution at a sub-centennial resolution throughout the Holocene. The relationship between past variability of Atlantic water inflow and sea ice distribution has been established by measurement of planktic foraminifera, stable isotopes and biomarkers from sea ice diatoms and phytoplankton. Throughout the early Holocene (11 900-7300 cal yr BP), the foraminiferal fauna is dominated by the polar species Neogloboquadrina pachyderma (sinistral) and the biomarkers show an influence of seasonal sea ice. Between 10 900 and 10 700 cal yr BP, a clear cooling is shown both by fauna and stable isotope data corresponding to the so-called Pre-boreal Oscillation. After 7300 cal yr BP, the sub-polar Turborotalita quinqueloba becomes the most frequent species, reflecting a stable Atlantic water inflow. Sub-surface temperatures reach 6 degrees C and biomarker data indicate mainly ice-free conditions. During the last 1100 cal yr BP, biomarker abundances and distributions show the reappearance of low-frequency seasonal sea ice and the planktic fauna show a reduced salinity in the sub-surface water. No apparent temperature decrease is observed during this interval, but the rapidly fluctuating fauna and biomarker distributions indicate more unstable conditions.
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