HR: 0800h
AN: PP21A-1368    [Abstracts]
TI: Climatic Seesaws Across The North Pacific As Revealed By High-Mountain Ice Cores Drilled At Kamchatka And Wrangell-St. Elias Mountains
AU: * Shiraiwa, T
EM: shiraiwa@pop.lowtem.hokudai.ac.jp
AF: Institute of Low Temperature Science, Hokkaido University, Kita-ku Kita 19, Nishi 8, Sapporo, 060-0819 Japan
AU: Goto-Azuma, K
EM: kumiko@pmg.nipr.ac.jp
AF: National Institute for Polar Research, Kaga 1 chome, Itabashi-ku, Tokyo, 173-8515 Japan
AU: Kanamori, S
EM: kanasyo@pop.lowtem.hokudai.ac.jp
AF: Institute of Low Temperature Science, Hokkaido University, Kita-ku Kita 19, Nishi 8, Sapporo, 060-0819 Japan
AU: Matoba, S
EM: matoba.sumito@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, 305-8506 Japan
AU: Benson, C S
EM: benson@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, Koyukuk Drive, P.O.Box 757320, Fairbanks, AK 99775-7320 United States
AU: Muravyev, Y D
EM: murjd@kcs.iks.ru
AF: Institute of Volcanology and Seismology, Far Eastern Branch of Russian Academy of Sciences, Piip Boulevard, Petropavlovsk-Kamcha, 683006 Russian Federation
AU: Salamatin, A N
EM: Andrey.Salamatin@ksu.ru
AF: Department of Applied Mathematics, Kazan State University, Kazan, Kazan, 420008 Russian Federation
AB: We drilled ca. 210-m deep ice cores at Mt. Ushkovsky (Kamchatka: 1998), King Col of Mt. Logan (2002) and Mt. Wrangell (2004). Thanks to the high accumulation rates up to 2 m per year in these mountains, the ice cores are expected to unveil the climate and atmospheric changes in the northern North Pacific during the last several centuries. The reconstructed annual accumulation rates time-series of Mt. Ushkovsky showed, for example, decadal to interdecadal oscillations which were closely correlated to the Pacific Decadal Oscillations (PDO). Comparison between the reconstructed accumulation rates between the Ushkovsky and our two ice cores from Wrangell-St. Elias mountains suggests that the PDO played an important role in determining the precipitation at both side of the northern North Pacific: positive PDO supplied high precipitation in the Pacific North America and the negative PDO did high in Kamchatka during the last two centuries. Beside the significance of the climate proxy signals, the physical properties of the ice cores and the related glaciological features at the three mountains provided unique feature of glaciers developing on high mountains with complicated topographies and high accumulation rates. It was shown that careful treatment of dynamic behavior in these high mountain glaciers are indispensable for the precise reconstruction of past accumulation time-series.
DE: 9355 Pacific Ocean
DE: 4215 Climate and interannual variability (3309)
DE: 1827 Glaciology (1863)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting