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アギュラスの漏れ動態は,大西洋の循環の転覆の10年間の変動に影響を与えます
A Biastoch1, C W Böning, J R E Lutjeharms
1Leibniz-Institut für Meereswissenschaften, Düsternbrooker Weg 20, 24105 Kiel, Germany. abiastoch@ifm-geomar.de
Nature
|November 28, 2008
まとめ
気候予測には,海洋循環のダイナミクスを理解する必要があります. 南半球の信号は,アギュラスの流出地域から,北大西洋の10年分の南極転覆循環 (MOC) の変動性に大きく影響します.
科学分野:
- 海洋学 海洋学とは
- 気候科学 気候科学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 10年間の気候進化の予測は,メリディオンの転覆循環 (MOC) を理解することにかかっている.
- 北大西洋の海洋測定プログラムでは,季節内から年中までのMOC変動が顕著であることが明らかになっています.
- 長期にわたるMOC輸送の変化は,歴史的なデータが少ないため,文書化が不十分です.
研究 の 目的:
- 10年にわたるMOC変動の要因を調査する.
- 北大西洋のMOCダイナミクスに対する南半球の影響の可能性を調査する.
- 気候予測のためのMOCの変動性のより包括的な理解を提供するために.
主な方法:
- 総合的な海洋モデルシミュレーションの分析.
- アグルハス漏れ地域からのダイナミック信号を追跡する.
- MOCの変動に対する北半球と南半球の貢献を比較する.
主要な成果:
- 北大西洋における10年間のMOCの変動は,北極の深水形成以外の要因の影響を受けています.
- 南半球のアグルハス流出地域からのダイナミックな信号は,北大西洋のMOCに大きく貢献しています.
- MOCの変動に対する南半球の寄与は,北半球の寄与と同等である.
結論:
- 観測されたMOCの変化は,北半球と南半球の両方の影響を考慮する必要があります.
- アギュラスの流出地域は,北大西洋における10年にわたるMOCの変動信号の重要な源泉である.
- 正確な気候予測には,南半球の海洋ダイナミクスをMOCモデルに組み込む必要がある.
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