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| Titel |
Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr |
| VerfasserIn |
J.-R. Riethdorf, D. Nürnberg, L. Max, R. Tiedemann, S. A. Gorbarenko, M. I. Malakhov |
| 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 ; 9, no. 3 ; Nr. 9, no. 3 (2013-06-26), S.1345-1373 |
| Datensatznummer |
250018071
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| Publikation (Nr.) |
 copernicus.org/cp-9-1345-2013.pdf |
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| Zusammenfassung |
| We used piston cores recovered in the western Bering Sea to reconstruct
millennial-scale changes in marine productivity and terrigenous matter supply
over the past ~180 kyr. Based on a geochemical multi-proxy approach,
our results indicate closely interacting processes controlling marine
productivity and terrigenous matter supply comparable to the situation in the
Okhotsk Sea. Overall, terrigenous inputs were high, whereas export production
was low. Minor increases in marine productivity occurred during intervals of
Marine Isotope Stage 5 and interstadials, but pronounced maxima were recorded
during interglacials and Termination I. The terrigenous material is suggested
to be derived from continental sources on the eastern Bering Sea shelf and to
be subsequently transported via sea ice, which is likely to drive changes in
surface productivity, terrigenous inputs, and upper-ocean stratification.
From our results we propose glacial, deglacial, and interglacial scenarios
for environmental change in the Bering Sea. These changes seem to be
primarily controlled by insolation and sea-level forcing which affect the
strength of atmospheric pressure systems and sea-ice growth. The opening
history of the Bering Strait is considered to have had an additional impact.
High-resolution core logging data (color b*, XRF scans) strongly correspond
to the Dansgaard–Oeschger climate variability registered in the NGRIP ice
core and support an atmospheric coupling mechanism of Northern Hemisphere
climates. |
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