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| Titel |
Multidecadal to millennial marine climate oscillations across the Denmark Strait (~ 66° N) over the last 2000 cal yr BP |
| VerfasserIn |
J. T. Andrews, A. E. Jennings |
| 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 (2014-02-14), S.325-343 |
| Datensatznummer |
250116913
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| Publikation (Nr.) |
 copernicus.org/cp-10-325-2014.pdf |
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| Zusammenfassung |
| In the area of Denmark Strait (~66° N), the two modes of the North
Atlantic Oscillation (NAO) and Arctic Oscillation (AO) are expressed in
changes of the northward flux of Atlantic water and the southward advection
of polar water in the East Iceland current. Proxies from marine cores along
an environmental gradient from extensive to little or no drift ice, capture
low frequency variations over the last 2000 cal yr BP. Key proxies
are the weight% of calcite, a measure of surface water stratification and
nutrient supply, the weight% of quartz, a measure of drift ice transport,
and grain size. Records from Nansen and Kangerlussuaq fjords show variable
ice-rafted debris (IRD) records but have distinct mineralogy associated with
differences in the fjord catchment bedrock. A comparison between cores on
either side of the Denmark Strait (MD99-2322 and MD99-2269) show a remarkable
millennial-scale similarity in the trends of the weight% of calcite with a
trough reached during the Little Ice Age. However, the quartz records from
these two sites are quite different. The calcite records from the Denmark Strait
parallel the 2000 yr Arctic summer-temperature reconstructions; analysis of
the detrended calcite and quartz data reveal significant multi-decadal–century periodicities superimposed on a major environmental shift occurring
ca. 1450 AD. |
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