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| Titel |
Multiproxy records of climate variability for Kamchatka for the past 400 years |
| VerfasserIn |
O. Solomina, G. Wiles, T. Shiraiwa, R. D'Arrigo |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2007-02-22), S.119-128 |
| Datensatznummer |
250000746
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| Publikation (Nr.) |
 copernicus.org/cp-3-119-2007.pdf |
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| Zusammenfassung |
| Tree ring, ice core and glacial geologic histories for the past several
centuries offer an opportunity to characterize climate variability and to
identify the key climate parameters forcing glacier expansion in Kamchatka
over the past 400 years. A newly developed larch ring-width chronology (AD
1632–2004) is presented that is sensitive to past summer temperature
variability. Individual low growth years in the larch record are associated
with several known and proposed volcanic events from the Northern
Hemisphere. The comparison of ring width minima and those of Melt Feature
Index of Ushkovsky ice core helps confirm a 1–3 year dating accuracy~for
this ice core series over the late 18th to 20th centuries. Decadal
variations of low summer temperatures (tree-ring record) and high annual
precipitation (ice core record) are broadly consistent with intervals of
positive mass balances measured and estimated at several glaciers in
20th century, and with moraine building. According to the tree-ring
data the 1860s–1880s were the longest coldest interval in the last 350
years. The latest part of this period (1880s) coincided with the positive
anomaly in accumulation. This coincidence led to a positive mass balance,
which is most likely responsible for glacier advances and moraine deposition
of the end of 19th-early 20th centuries. As well as in some other
high latitude regions (Spitsbergen, Polar Urals, Franz Jozef Land etc.) in
Kamchatka these advances marked the last millennium glacial maximum. In full
agreement with subsequent summer warming trend, inferred both from
instrumental and tree ring data, glacier advances since 1880s have been less
extensive. The late 18th century glacier expansion coincides with the
inferred summer temperature decrease recorded by the ring width chronology.
However, both the advance and the summer temperature decrease were less
prominent that in the end of 19th century. Comparisons of the glacier
history in Kamchatka with records from Alaska and the Canadian Rockies
suggests broadly consistent intervals of glacier expansion and inferred
summer cooling during solar irradiance minima. |
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