最後の氷河期の終結期における大気中のCO2濃度
E Monnin1, A Indermühle, A Dällenbach
1Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.
まとめ
大気中の二酸化炭素 (CO2) 濃度は,最後の脱氷期の6000年にわたって76ppm上昇した. 南大洋と北半球/熱帯のプロセスの両方が,この重要なCO2増加に影響を与えました.
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
- アイス・コア・サイエンス アイスコア・サイエンス
- 気候変動研究 気候変動研究
背景:
- 過去の気候変動の移行を理解することは,将来の気候変動を予測する上で極めて重要です.
- 大気中の二酸化炭素 (CO2) とメタン (CH4) は,地球気候に影響を与える重要な温室効果ガスである.
- 氷の芯は,大気組成と気温の貴重な長期記録を提供します.
研究 の 目的:
- 最後の氷河期最大期からホロセンの移行期における大気中のCO2濃度を再構築する.
- 二酸化炭素の変化,南極の気温,メタンの変動との関係を調査する.
- 脱氷時のCO2増加を促す主要な地域とプロセスを特定する.
主な方法:
- 南極のドーム・コンコルディアの氷芯の分析.
- 大気中の二酸化炭素 (CO2) の濃度測定は,氷のコアの記録から.
- CO2の動向を南極の気温データと大気中のメタン濃度と比較.
主要な成果:
- 大気中のCO2は6000年以上にわたり,体積 (ppmv) によって100万分の76の大幅な増加を記録した.
- CO2の上昇は4つの異なる間隔で発生し,南極の気温変化と密接に相関しています.
- CO2とメタンの濃度の変化の間の類似性は,熱帯と北半球の源からの貢献を示唆しています.
結論:
- 南大洋は,脱氷期におけるCO2増加に重要な役割を果たした.
- メタンの主要な源である熱帯と北半球におけるプロセスもまた,大気中のCO2に実質的な影響を及ぼした.
- 脱氷は,温室効果ガスのレベルに影響を与える異なる地球システム間の複雑な相互作用を伴う.
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