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| Titel |
A 250 ka oxygen isotope record from diatoms at Lake El'gygytgyn, far east Russian Arctic |
| VerfasserIn |
B. Chapligin, H. Meyer, G. E. A. Swann, C. Meyer-Jacob, H.-W. Hubberten |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2012-10-17), S.1621-1636 |
| Datensatznummer |
250005846
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| Publikation (Nr.) |
 copernicus.org/cp-8-1621-2012.pdf |
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| Zusammenfassung |
| In 2003 sediment core Lz1024 was drilled at Lake El'gygytgyn, far east
Russian Arctic, in an area of the Northern Hemisphere which has not been
glaciated for the last 3.6 Ma. Biogenic silica was used for analysing the
oxygen isotope composition (δ18Odiatom) in the upper
13 m long section dating back about 250 ka with samples dominated by one
taxa in the <10 μm fraction (Cyclotella ocellata).
Downcore variations in δ18O values show that glacial-interglacial
cycles are present throughout the core and δ18Odiatom-values are mainly controlled by
δ18Oprecipitation. Changes reflect the Holocene Thermal Maximum,
the Last Glacial Maximum (LGM) and the interglacial periods corresponding to
MIS 5.5 and MIS 7 with a peak-to-peak amplitude between LGM and MIS 5.5 of
Δ18O = 5.3‰. This corresponds to a mean annual air
temperature difference of about 9 °C. Our record is the first
continuous δ18Odiatom record from an Arctic lake
sediment core directly responding to precipitation and dating back more than
250 ka and correlates well with the stacked marine δ18O LR04
(r = 0.58) and δD EPICA Dome-C record (r = 0.69). With
δ18O results indicating strong links to both marine and ice-core records,
records from Lake El'gygytgyn can be used to further investigate the
sensitivity of the Arctic climate to both past and future global climatic
changes. |
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