最後の3つの氷河期の終結点周辺の大気中のCO2の氷芯記録
1Scripps Institution of Oceanography, Geosciences Research Division, University of California San Diego, La Jolla, CA 92093-0220, USA.
まとめ
古代の氷の核は,過去の温暖化事件から600年後に二酸化炭素のレベルが上昇したことを明らかにしています. 高濃度のCO2は氷河期にも存在し,前回の温暖期と生物圏の変化に関連していた.
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
- 気候科学 気候科学
- 地球システム科学 地球システム科学
背景:
- 北極の氷芯は,古代の気泡を保存し,過去の大気組成に関する重要なデータを提供しています.
- 過去の温室効果ガスの動態を理解することは,将来の気候変動を予測するために不可欠です.
- 世界的な炭素循環の再構築は,地球の気候感受性についての洞察を提供します.
研究 の 目的:
- 過去の温暖化と大気中の二酸化炭素 (CO2) 濃度との関係を分析する.
- 脱氷の出来事に対するCO2増加のタイミングと持続を調査する.
- 長期の炭素循環フィードバックにおける陸上の生物圏と氷床のダイナミクスの役割を調査する.
主な方法:
- 南極の氷の核からの高解像度記録の分析.
- 過去のCO2濃度を決定するために,閉じ込められた空気泡の測定.
- CO2データと氷の核の記録から得られた古気候指標の相関.
主要な成果:
- 南極の氷芯データによると,CO2濃度は,過去3回の脱氷が始まってから600年±400年後に80〜100ppm増加した.
- 氷河期の間,気温が下がっても,持続的に高いCO2レベルが観察されました.
- 前回の温暖期間の期間は,脱氷中のCO2相遅れに影響するようです.
結論:
- 温暖化現象と,その後のCO2増加の間には,かなりの時間遅れがあり,複雑なフィードバックメカニズムを示しています.
- 陸上の生物圏と陸上氷の覆いの変化は,氷河期と氷河期間のサイクルで大気中のCO2を調節する上で重要な役割を果たしています.
- 過去の気候ダイナミクスは,地球システムの遅いが強力なフィードバックを強調し,長期的な炭素循環の安定性に影響を与えます.
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