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降水と気候の酸素-18同位体の組成の長期的傾向との関連
まとめ
降水中の安定した同位体比は,古気候の重要な指標である. この研究は,降水量を示しています.
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
- イソトープ水文学のイソトープ
- 気候科学 気候科学
背景:
- 水中の酸素 (18O/16O) と水素 (D/H) の安定した同位体比は,重要な古気候の代理物である.
- 古代気候データの定量的な解釈は,地球上の同位体行動の不完全な理解によって制限されています.
研究 の 目的:
- 降雨の同位体組成と地表空気の温度との関係を調査する.
- 中高緯度の地域における同位体組成と気温の長期的な傾向を分析する.
主な方法:
- IAEA-WMOの"降水中の同位体"ネットワークからの月間降水量と地表気温データの分析.
- 過去30年間の酸素-18含量 (デルタ18O) と気温のタイムシリーズ分析.
主要な成果:
- 降雨の同位体組成の長期的な変化は,地表空気の気温の変化を密接に追跡した.
- 平均デルタ18O温度係数は,摂氏1度あたり0.6ミリあたり約0.6であった.
結論:
- 強い相関は,降雨の同位体組成を信頼できる古気候指標として使用することを支持しています.
- パレオ気候の同位体記録から過去の温度を再構築するための定量的な関係を提供します.
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