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| Titel |
Accumulation reconstruction and water isotope analysis for 1736-1997 of an ice core from the Ushkovsky volcano, Kamchatka, and their relationships to North Pacific climate records |
| VerfasserIn |
T. Sato, T. Shiraiwa, R. Greve, H. Seddik, E. Edelmann, T. Zwinger |
| 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 (2014-02-21), S.393-404 |
| Datensatznummer |
250116917
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| Publikation (Nr.) |
 copernicus.org/cp-10-393-2014.pdf |
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| Zusammenfassung |
| An ice core was retrieved in June 1998 from the Gorshkov crater glacier
at the top of the Ushkovsky volcano, in central Kamchatka. This ice core
is one of only two recovered from Kamchatka so far, thus filling a gap
in the regional instrumental climate network. Hydrogen isotope
(δD) analyses and past accumulation reconstructions were
conducted for the top 140.7 m of the core, spanning 1736–1997. Two
accumulation reconstruction methods were developed and applied with the
Salamatin and the Elmer/Ice firn-ice dynamics models, revealing a
slightly increasing or nearly stable trend, respectively. Wavelet
analysis shows that the ice core records have significant decadal and
multi-decadal variabilities at different times. Around 1880 the
multi-decadal variability of δD became lost and its
average value increased by 6‰. The multi-decadal variability
of reconstructed accumulation rates changed at around 1850.
Reconstructed accumulation variations agree with ages of moraines in
Kamchatka. Ice core signals were significantly correlated with North
Pacific sea surface temperature (SST) and surface temperature (2 m
temperature). δD correlates with the North Pacific Gyre
Oscillation (NPGO) index after the climate regime shift in 1976/1977,
but not before that. Therefore, our findings imply that the ice core
record contains various information on the local, regional and
large-scale climate variability in the North Pacific region.
Understanding all detailed mechanisms behind the time-dependent
connections between these climate patterns is challenging and requires
further efforts towards multi-proxy analysis and climate modelling. |
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