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高解像度の二酸化炭素濃度記録は,現在より65万~80万年前のものです
Dieter Lüthi1, Martine Le Floch, Bernhard Bereiter
1Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland. luethi@climate.unibe.ch
Nature
|May 16, 2008
まとめ
大気中の二酸化炭素レベルは,南極の氷の核で測定され,記録を80万年に延長しました. CO2濃度は65万~75万年前より低かったが,新低172 p.p.m.v.を記録した.
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
- アイス・コア・サイエンス アイスコア・サイエンス
- 大気化学 大気化学
背景:
- 大気中の二酸化炭素 (CO2) レベルは,地球の気候を理解するために非常に重要です.
- 南極の氷芯は,過去の大気組成の貴重な記録を提供します.
- ヴォストークとエピカドームCの過去の記録は,65万年まで伸びていた.
研究 の 目的:
- 大気中のCO2記録を過去まで延長する.
- 過去の氷河期間のCO2濃度を調査する.
- CO2と南極の気温の間の関係をより長い時間スケールで分析する.
主な方法:
- EPICAドームC氷芯の最低200mに閉じ込められた空気の分析.
- ガスクロマトグラフィを用いた二酸化炭素濃度の測定.
- CO2データと南極の温度再構築の比較.
主要な成果:
- 大気中のCO2記録は,現在より80万年前まで延長され,さらに2つの氷河周期をカバーしました.
- 大気中のCO2濃度は,8つの氷河周期を通して南極の気温と強く相関しています.
- CO2濃度が大幅に低下した (180 p.p.m.v.以下) 65万~75万年前に観測され,その中には180 p.p.m.v.以下で3000年の期間があった. 海洋イソトープステージ16で発生した.
- 測定された最も低いCO2濃度は172 ppm (p.p.m.v.) でした. ),工業化以前の範囲を拡大する.
結論:
- 過去の大気中のCO2レベルは,複数の氷河期と氷河期間のサイクルで南極の温度と強い相関を示しています.
- 延長された氷芯記録は,海洋における炭素貯蔵の強化と潜在的に関連している,非常に低い二酸化炭素濃度の期間を明らかにしています.
- この研究は,大気中のCO2の自然的な変動性と,過去80万年にわたる気候との関係についての理解を洗練します.
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