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過去3世紀にわたって北太平洋地域における気候変動
G W K Moore1, Gerald Holdsworth, Keith Alverson
1Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada. moore@atmosp.physics.utoronto.ca
Nature
|December 3, 2002
まとめ
ロガン山の301年の氷芯記録は,北米の気候パターンに関連した雪の蓄積傾向を明らかにしています. このプロキシデータは,歴史的な気候変動性研究を拡張し,19世紀半ば以来の温暖化傾向を示しています.
科学分野:
- 気候学 気候学
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 氷河学 氷河学とは
背景:
- 楽器による気候記録は,長期の気候変動の変動を研究するには,しばしば短すぎます.
- 氷のコアなどのプロキシデータは,過去の気候条件の再構築に不可欠です.
- パシフィック北米パターンやパシフィック10年振動などの支配的な気候パターンは,包括的な分析のために拡張された記録を必要とします.
研究 の 目的:
- 北米北西部のローガン山から301年の積雪記録を再構築する.
- プロキシデータを用いて,雪の蓄積と主要な気候パターンとの関係を調査する.
- 小さな氷河期から最近の温暖化期まで,気候の変動に関する理解を広げる.
主な方法:
- ロガン山 (標高5,340m) の氷芯から301年の積雪記録の分析.
- 氷のコア記録と太平洋北米パターンと太平洋十年振動の楽器データとの比較.
- 積雪と気候の変動の傾向と相関を特定するための統計分析.
主要な成果:
- マウント・ローガン山の積雪記録は,観測期間中の太平洋北米のパターンと密接に相関しています.
- 19世紀半ば以降,積雪のポジティブで加速する傾向が観察されました.
- この傾向は,地域温暖化と太平洋北米パターンと太平洋十年振動の世俗的な変化に並行しています.
結論:
- 301年の氷芯記録は,北米北西部の過去の気候変動を理解するための貴重な代理データを提供します.
- 雪の積もりの傾向は,19世紀半ば以来の大規模な温暖化傾向を示しており,これは主要な気候振動の変化に関連しています.
- この研究は,気候研究を楽器の限界を超えて拡張するために,氷のコアの記録の重要性を強調しています.
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