北太平洋の底深い海域の急速な温暖化をシミュレートした

Shuhei Masuda¹, Toshiyuki Awaji, Nozomi Sugiura

¹Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 236-0001, Japan. smasuda@jamstec.go.jp

Science (New York, N.Y.)

|June 26, 2010

まとめ

海底の水が急速に温暖化しています. コンピューターシミュレーションによると,南極の表面熱の変化は,内部波を通して北太平洋の底水を急速に温め,以前の時間スケールの推定に異議を唱えている.

科学分野:

海洋学海洋学とは
気候科学気候科学
南極研究南極研究

背景:

観測調査により,海底水の温暖化が著しく起きていることが明らかになった.
この温暖化を誘発するメカニズムと時間軸は,十分に理解されていない.
現在の理解は,深海の熱変化のための遅い,多世紀間のプロセスを示唆しています.

研究の目的:

海洋底水の温暖化のメカニズムと時間スケールを調査する.
南極の表面状態と深海の温暖化との間のテレコネクションを調査するために.
深海の熱含有量の空気と海の相互作用に対する感受性を再評価する.

主な方法:

先進的なコンピュータシミュレーションを用いて.
南極のアデリエ海岸沖の空海熱流の変化をモデル化.
内部波動力学による熱異常の伝播を分析する.

主要な成果:

南極の表面空気海熱流と北太平洋の底水の温暖化との間に確認された急速なテレコネクション.
この温暖化関連は,過去40年間にわたって確立され,これまで推定されていたよりもはるかに速い.
内部波は,この加速された熱伝送において重要な役割を果たします.

結論:

深海の熱含有量は,以前考えられていたよりも地表の熱交換に敏感である.
南大洋は,深海の温暖化を調節する上で重要で迅速な役割を果たしています.
この発見は,大気温暖化が深海の水域に及ぼす影響を再評価することを必要としている.

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