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掘削孔の温度から再構築された過去5世紀の気温の動向
1Department of Geological Sciences, The University of Michigan, Ann Arbor 48109-1063, USA.
Nature
|February 29, 2000
まとめ
616の掘削孔からの地表温度データは,地球が過去500年間に約1K温暖化したことを明らかにしています. この採掘孔データは,伝統的な温度プロキシと楽器記録を補完する,重要な長期的な気候の見通しを提供します.
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
- 地球科学 地球科学 地球科学
- 気候変動研究 気候変動研究
背景:
- 地球の気候の変動性と人為的な影響の正確な評価は,長期的な温度再構築を必要とする.
- 楽器記録は過去150年に限られており,気候のプロキシ記録に頼る必要がある.
- 伝統的な気候プロキシは,気候の変動を捉える上で固有の強みと限界を持っています.
研究 の 目的:
- 地下温度データを用いて,過去500年の"世紀間の気温の動向を再構築する.
- 過去の表面温度変化の独立したアーカイブを提供し,楽器記録とプロキシ記録を補完します.
- 過去5世紀における地球,半球,大陸の気温の変化を評価する.
主な方法:
- 南極大陸を除くすべての大陸の616の掘削孔からの現在の地表温度の分析.
- 地球への熱伝導に基づいた過去の気温動向の再構築.
- 掘削孔から派生した傾向を,楽器記録と従来の気候プロキシと比較.
主要な成果:
- 20世紀に観測された大きな温暖化は,楽器の記録によって確認された.
- 過去500年間で累積的な気温上昇が約1Kであったと推定されている.
- 採掘孔による累積的な温暖化は,従来の気候プロキシから得られた最近の推定値を超えていることを示した.
結論:
- 掘削孔からの地表温度データは,長期的な気候傾向を検出するための貴重な方法を提供します.
- 掘削洞のデータは,従来の気候プロキシと楽器記録に補完的な視点を提供します.
- 掘削孔データと他の気候再構築アプローチの違いを調和させるため,過去の温暖化の包括的な理解のためにさらなる調査が必要である.
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