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| Titel |
Amplified bioproductivity during Transition IV (332 000-342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn |
| VerfasserIn |
L. Cunningham, H. Vogel, V. Wennrich, O. Juschus, N. Nowaczyk, P. Rosén |
| 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. 2 ; Nr. 9, no. 2 (2013-03-14), S.679-686 |
| Datensatznummer |
250018013
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| Publikation (Nr.) |
 copernicus.org/cp-9-679-2013.pdf |
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| Zusammenfassung |
| To date, terrestrial archives of long-term climatic change within the Arctic
have widely been restricted to ice cores from Greenland and, more
recently, sediments from Lake El'gygytgyn in northeast Arctic Russia.
Sediments from this lake contain a paleoclimate record of
glacial-interglacial cycles during the last three million years.
Low-resolution studies at this lake have suggested that changes observed
during Transition IV (the transition from marine isotope stage (MIS) 10 to
MIS 9) are of greater amplitude than any observed since. In this study,
geochemical parameters are used to infer past climatic conditions thus
providing the first high-resolution analyses of Transition IV from a
terrestrial Arctic setting. These results demonstrate that a significant
shift in climate was subsequently followed by a rapid increase in biogenic
silica (BSi) production. Following this sharp increase, bioproductivity
remained high, but variable, for over a thousand years. This study reveals
differences in the timing and magnitude of change within the ratio of silica
to titanium (Si/Ti) and BSi records that would not be apparent in lower
resolution studies. This has significant implications for the increasingly
common use of Si/Ti data as an alternative to traditional BSi measurements. |
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