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北部北太平洋地域における山岳アイスコア研究
的場, 澄人
Permalink : http://hdl.handle.net/2115/91751
JaLCDOI : 10.14943/lowtemsci.82.161
KEYWORDS : 山岳氷河;古環境復元;北部北太平洋;アイスコア掘削;Ice core;Alpine glacier;Reconstruction of paleo-environment;northern North Pacific;Ice-core drilling
Abstract
山岳氷河は南極やグリーンランドの氷床と比べて年間の涵養量が著しく高いため，山岳アイスコアで掘削されたアイスコアは高い時間分解能で環境を復元することができる．低温科学研究所では，北部北太平洋地域の環境復元を目的にカムチャツカ半島で２ヶ所，アラスカで2ヶ所の山岳氷河から計５本のアイスコアを採取した．これらのアイスコアから，カムチャツカとアラスカにおける数百年間の年間涵養量が復元され，北部北太平洋域への大気由来鉄の沈着量が復元されるなどの成果が得られた．この一連の研究から，精密な年代決定がなされたアイスコアを用いれば，気象再解析データ，気候モデルと比較できる降水量やエアロゾル沈着量のデータを復元できることが示された．
Alpine glaciers have significantly higher annual accumulation rates than the Antarctic and Greenland Ice Sheets, allowing for environmental reconstruction with high temporal resolution. The Institute of Low Temperature Science has collected a total of five alpine glacier ice cores from two mountain glaciers in the Kamchatka Peninsula and two in Alaska to reconstruct the environmental changes in the northern North Pacific region. As a result of these researches, hundreds of years of annual accumulation rates in Kamchatka and Alaska have been reconstructed, as well as the deposition of air-borne iron to the northern North Pacific region. This series of researches showed that precisely dated ice cores can recover precipitation and aerosol deposition data that can be compared to meteorological reanalysis data and climate models.
Alpine glaciers have significantly higher annual accumulation rates than the Antarctic and Greenland Ice Sheets, allowing for environmental reconstruction with high temporal resolution. The Institute of Low Temperature Science has collected a total of five alpine glacier ice cores from two mountain glaciers in the Kamchatka Peninsula and two in Alaska to reconstruct the environmental changes in the northern North Pacific region. As a result of these researches, hundreds of years of annual accumulation rates in Kamchatka and Alaska have been reconstructed, as well as the deposition of air-borne iron to the northern North Pacific region. This series of researches showed that precisely dated ice cores can recover precipitation and aerosol deposition data that can be compared to meteorological reanalysis data and climate models.
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