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| Titel |
A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis |
| VerfasserIn |
U. Frank, N. R. Nowaczyk, P. Minyuk, H. Vogel, P. Rosén, M. Melles |
| 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. 4 ; Nr. 9, no. 4 (2013-07-22), S.1559-1569 |
| Datensatznummer |
250018092
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| Publikation (Nr.) |
 copernicus.org/cp-9-1559-2013.pdf |
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| Zusammenfassung |
| Rock magnetic, biochemical and inorganic records of the sediment cores
PG1351 and Lz1024 from Lake El'gygytgyn, Chukotka peninsula, Far East
Russian Arctic, were subject to a hierarchical agglomerative cluster
analysis in order to refine and extend the pattern of climate modes as
defined by Melles et al. (2007). Cluster analysis of the data obtained from
both cores yielded similar results, differentiating clearly between the four
climate modes warm, peak warm, cold and dry, and cold and moist. In
addition, two transitional phases were identified, representing the early
stages of a cold phase and slightly colder conditions during a warm phase.
The statistical approach can thus be used to resolve gradual changes in the
sedimentary units as an indicator of available oxygen in the hypolimnion in
greater detail. Based upon cluster analyses on core Lz1024, the published
succession of climate modes in core PG1351, covering the last 250 ka, was
modified and extended back to 350 ka. Comparison to the marine oxygen
isotope (δ18O) stack LR04 (Lisiecki and Raymo, 2005) and the
summer insolation at 67.5° N, with the extended Lake El'gygytgyn
parameter records of magnetic susceptibility (κLF), total
organic carbon content (TOC) and the chemical index of alteration (CIA;
Minyuk et al., 2007), revealed that all stages back to marine isotope stage
(MIS) 10 and most of the substages are clearly reflected in the pattern
derived from the cluster analysis. |
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