まとめ
チリからの3,622年のアラルシの木の記録は,長期の気温変動を明らかにしています. この研究では,南米南部で最近の人為的な温暖化の証拠は見つかりませんでしたが,自然気候の変動性を強調しています.
科学分野:
- 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
- デンドロクロノロジー (Dendrochronology) とは
- 気候科学 気候科学
背景:
- 過去の気候変動の変動を理解することは,現在の気候変動の文脈化にとって極めて重要です.
- ツリーリングクロノロジーは,過去の温度を再構築するための高解像度プロキシデータを提供します.
- チリ南部のアレレツの木 (Fitzroya cupressoides) は,長期的な気候研究のためのユニークなアーカイブを提供します.
研究 の 目的:
- 南アメリカ南部で3622年の夏の気温記録を,アレルセの木のリングを使って再構築する.
- 長期の気温動向を調査し,著しい温暖化と冷却の時期を特定する.
- 地域における人類による温暖化に関する証拠を,プロキシデータおよび楽器データに基づいて評価する.
主な方法:
- フィッツロヤ cupressoides.から毎年解決されたツリーリングの幅クロノロジーの構築.
- ツリーリングのデータと温度記録の計測を計測する.
- 長期的なパターンと異常を特定するために,3,622年の温度再構築の分析.
主要な成果:
- 平均より高い夏の気温の最も長い間隔は,紀元前80年から発生した. A.D. 160年まで遡ります.
- A.D. 300年から470年まで,A.D. 1490年から1700年まで,平均より低い温度が長期間観測された.
- アレルスのツリーリングデータも,楽器記録も,南南アメリカ (35-44°S) の南部で,近年の人為的な温暖化の証拠を示していません.
結論:
- アレレツの木は,南米南部における過去の気候を再構築するために,価値のある長期的なプロキシを提供します.
- この地域は,過去3千年以上にわたり,自然による気温の変動が顕著であった.
- この地域における現在の温暖化傾向は,この研究の発見に基づいて,人為的な原因に起因することができない.
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