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| Titel |
Holocene sub-centennial evolution of Atlantic water inflow and sea ice distribution in the western Barents Sea |
| VerfasserIn |
S. M. P. Berben, K. Husum, P. Cabedo-Sanz, S. T. Belt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 1 ; Nr. 10, no. 1 (2014-01-23), S.181-198 |
| Datensatznummer |
250116903
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| Publikation (Nr.) |
 copernicus.org/cp-10-181-2014.pdf |
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| Zusammenfassung |
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 Preboreal 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 °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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