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アラブ海の脱窒化における千年規模の変化が大気中のCO2に及ぼす影響
Mark A Altabet1, Matthew J Higginson, David W Murray
1School for Marine Science and Technology, University of Massachusetts Dartmouth, 706 S. Rodney French Boulevard, New Bedford, Massachusetts 02744-1221, USA. maltabet@umassd.edu
Nature
|January 24, 2002
まとめ
温室効果ガスの規制に不可欠な海洋脱窒化は,最後の氷河期の間にアラビア海で千年規模の変化を示した. これらの変化は,気候変動に対応して生態系を急速に再編成し,世界の生産性に影響を与えました.
科学分野:
- 海洋生物ジオケミストリー
- 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
- 海洋学 海洋学 海洋学
背景:
- 海洋デニトリフィケーションを含む地球規模の生地化学プロセスは,温室効果ガスを調節することによって気候に影響を与えます.
- 海洋の窒素除去は,酸化窒素の産生と海洋の二酸化炭素の吸収を,生物的ポンプを通じて影響する.
- 急速な気候変動に対するデニトリフィケーションの反応を理解することは,気候フィードバックの評価に不可欠です.
研究 の 目的:
- 最後の氷河期におけるアラビア海の脱窒化と生産性のミレニアムスケールの変動を調査する.
- Dansgaard-Oeschger現象のような急速な気候現象とこれらの変化を相関させる.
- 気候変動への反応として生態系の再編成を推進するメカニズムを理解する.
主な方法:
- 窒素同位体比,窒素含量,および高蓄積堆積コアからの塩素豊富さの分析.
- 堆積物コアのデータとグリーンランドの氷のコアの記録の相関 (ダンズガード-オシュガー現象).
- 南極の氷の核からの長期的な気候振動の調査.
主要な成果:
- アラブ海の脱窒化と生産性の実質的な千年スケールの変動は,最後の氷河期中に特定されました.
- これらの海洋変化とグリーンランドの氷の核の記録の間に詳細な対応が発見され,急速な,世紀規模の生態系再編成を示しています.
- 変化の媒介は,気候の遠足に関連した夏季季風の上昇の強さでした.
- 脱窒化変化に対する世界の海洋生産性の反応は,より低い周波数で発生し,南極の気候とCO2の振動と相関しています.
結論:
- アラブ海の脱窒化と生産性は,モンスーンの上昇によって媒介される,気候変動に対する急速な,世紀規模の反応を示しています.
- これらの急速な海洋生態系の変化は,世界の炭素循環と大気中のCO2レベルに影響を及ぼします.
- 固定窒素の長期滞在時間は,気候変動に対する世界的な海洋生産性のフィードバックがより低い周波数で動作することを示唆しています.
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