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1950年代以降の南洋の温暖化
1Scripps Institution of Oceanography and Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA 92093-0230, USA. sgille@ucsd.edu
Science (New York, N.Y.)
|February 16, 2002
まとめ
南大洋の深度中部の気温は,1950年代から1980年代にかけて著しく上昇した. この温暖化は,自律ラグランジア循環探査機 (Autonomous Lagrangian Circulation Explorer) の浮遊物によって記録され,地球温暖化よりも速く,南極環極流に集中しています.
科学分野:
- 海洋学 海洋学とは
- 気候科学 気候科学
- 南洋のダイナミクス
背景:
- 歴史的な水文学的データは,南洋の気温のベースラインを提供します.
- 自動ラグランジア循環探査機 (ALACE) の浮遊船は,海洋学的な変化に関する新しい洞察を提供します.
研究 の 目的:
- 南大洋の深度温度の傾向を分析するために.
- 南大洋の温暖化率を世界の平均値と比較するために.
主な方法:
- 700~1100メートルの深さで展開されたALACEの浮遊艇からの温度記録を利用した.
- 1990年代のALACEデータを,1950年代から1980年代までの歴史的な水文測定値と比較.
主要な成果:
- 南洋の深度中央の気温は,1950年代から1980年代まで0.17°Cの温暖化傾向を示しています.
- 南洋の観測された温暖化は,地球全体の海洋平均より速い.
- 温度の変化は,南極環極流の中で最も顕著です.
結論:
- 南極海は,中深層で加速された温暖化を経験しています.
- 南極環極流の温暖化率は,大気温上昇に匹敵する.
- これらの発見は,南洋の気候変動に対する感受性を強調しています.
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