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脱氷期におけるインド太平洋温水プールにおける温度変化の大きさとタイミング
Katherine Visser1, Robert Thunell, Lowell Stott
1Department of Geological Sciences, University of South Carolina, Columbia, South Carolina 29205, USA.
Nature
|January 10, 2003
まとめ
熱帯太平洋の海面温度は,北半球の氷床が溶ける前に,氷河期と氷河期間の周期の間に著しく上昇しました. これは,熱帯太平洋が地球の重要な原動力であることを示唆しています.
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
- 海洋-大気相互作用
- 気候システムのダイナミクス
背景:
- 熱帯太平洋の海洋と大気間の相互作用は,地球温暖化と水蒸気輸送に大きく影響し,気候システムに影響を与えます.
- 熱帯インド太平洋の変化は,年間から十年間の気候の変動を説明しますが,ミレニアムおよび軌道気候のシフトにおけるその役割は不明です.
研究 の 目的:
- 氷河期と氷河期間の気候の変化における熱帯インド太平洋地域の役割を,ミレニアム・オービタル・タイムスケールで調査する.
- 過去の気候転換期における海面温度と氷の量変化の同期的な見積もりを得るため.
主な方法:
- マカサール海峡から採取したフォラミニフェラル殻の酸素同位体とMg/Ca比の分析.
- 地化学的なプロキシを用いた海面温度と氷の量の再構築.
主要な成果:
- 熱帯太平洋の海面気温は,過去2つの氷河期と氷河期間の移行期間に3.5-4.0°C上昇した.
- この温暖化は,大気中のCO2の増加と南極の温暖化に同期した.
- 熱帯太平洋の温暖化が北半球の氷床の融解を2,000〜3,000年前に先行した.
結論:
- 熱帯太平洋地域は,氷河期と氷河期間のサイクルを駆動する上で重要な役割を果たしています.
- この影響は,エルニーニョ/南方振動が極方方向の熱と水蒸気流を調節するメカニズムに類似したメカニズムで作用する可能性があります.
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