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オープンシステムのサンゴの年齢は,持続的な軌道下海平面サイクルを明らかにします
William G Thompson1, Steven L Goldstein
1Lamont-Doherty Earth Observatory (LDEO) and Department of Earth and Environmental Sciences, Columbia University, Palisades, NY 10964, USA. wthompson@whoi.edu
Science (New York, N.Y.)
|April 16, 2005
まとめ
地球上の海平面の変化は,地球の軌道変動によって説明できない頻繁な振動を示しています. 新しい年代測定法により,海平面の再構築が改善され,これらの持続的で急速な気候変動が明らかになりました.
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,古代気候学 (paleoclimatology) とは
- ジオクロノロジー (Geochronology) について
- 気候科学 気候科学
背景:
- 海水位は,世界的な気候変動の重要な指標として機能しています.
- 地球の軌道の変動は,長い時間スケール (最低21,000年周期) で海面に影響することが知られている.
- 軌道下周波数の海面の変化は,ウラン・ソリウムサンゴの年代測定の限界のために,正確に再構築することが困難でした.
研究 の 目的:
- 過去の海面変化を再構築するためのより正確な方法を開発する.
- 頻度の高い海面の振動の原因を調査する.
- 気候の動態をよりよく理解するために,サブオービタル周波数の海面の変化を解決する.
主な方法:
- ウラン系ナキュリドのオープンシステム行動に対するサンゴの年齢を修正するために,新しいアプローチが採用されました.
- この方法により,海面再建の精度と解像度が向上します.
- ウラン/ソリウム年代測定法は,以前の制限を克服するために精製されました.
主要な成果:
- 高解像度の海面曲線が成功裏に生成されました.
- 軌道強制よりも高い周波数を持つ持続的な海平面振動が特定されました.
- この発見は,軌道変動による海面変化の独占的な説明に異議を唱えている.
結論:
- サブオービタル周波数の気象振動は,海面に大きな影響を与える.
- 新しい年代測定方法により,古気候研究のためのより信頼性の高いツールが提供されます.
- これらの急速な海面変化を理解することは,将来の気候変動の影響を予測する上で極めて重要です.
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