open access

https://hdl.handle.net/2115/20455

Past climate reconstruction by means of ice core analyses recovered from high-mountains in the northern North Pacific

日本語

2007-03-23

北海道大学低温科学研究所

Low Temperature Science

65

57-65

1章 10年～100年スケールの気候変動の観測, 気候復元とモニタリング

Three indepewndent ice cores were recently drilled at Ushkovsky Volcano in Kamchatka, Russia, Mount Wrangell in Alaska, and Mount Logan King Col in Canada. Detailed analyses of the temperature and density profiles of the three cores suggest that the three sampled glaciers are cold glaciers and therefore store reliable paleo-climate information that spans the past several hundreds to a thousand years. A negative relation was found for the net accumulation time-series reconstructed for the past 170 years from the ice cores recoverd from Ushkovsky Volcano and Mount Logan. As the oscillations in the net accumulation rate and the average annual δ^18O reconstructed from the Ushkovsky ice core appear to be closely correlated with the so-called Pacific Decadal Oscillation (PDO) Index, it was suggested that the mass balances of the glaciers on both sides of the northern North Pacific were affected not only by a global warming trend since the Little Ice Age but also by inter-decadal climate variability that had occured dominantly over the North Pacific.

紀要論文

Version of Record

1880-7593

AA12122962