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プレイストセンの半ばの気候移行を通して,海洋温度と氷の量の進化
H Elderfield1, P Ferretti, M Greaves
1Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK. he101@cam.ac.uk
まとめ
プレイストセーン中期の移行期 (MPT) は,地球の気候サイクルを10万年というより長い周期に移した. この変化は,90万年前に南極の氷の量が急増したことで引き起こされた.
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
- 四次地質学 四次地質学
- 気候のダイナミクス
背景:
- 地球の気候は,約125万年から70万年前,プレイストセンの中期移行期 (MPT) の間,著しい変化を経験しました.
- MPTの間,支配的な気候サイクルの周期性は,41,000年から10万年に変化し,大きな軌道強制の変化はなかった.
- 氷河期と深海の温度を示す深海のホルマニフェラル酸素同位体比は,変動が増加したことを示した.
研究 の 目的:
- ミッド・プレイストセーン・トランジション (MPT) の原動力を調査する.
- 酸素同位体比に対する深海の温度と地球上の氷の量による影響を区分する.
- MPTの開始イベントとタイムラインを決定する.
主な方法:
- 温度と氷の体積の変化に起因する酸素同位体比の分離効果.
- 深海におけるオキシジンの同位体データを分析した.
- 過去の気候の動態と氷床の振る舞いの再構築.
主要な成果:
- MPTは漸進的な冷却によって引き起こされたのではなく,90万年前に南極の氷の量が急激に増加したからです.
- 酸素イソトープのデータは,氷河期最大期毎の凍結に近い温度を示した.
- この研究では,温度と氷の量による同位体シフトへの貢献をうまく解明しました.
結論:
- 南極の急激な氷の量増加により,プレイストセーン中期の移行期 (MPT) が始まりました.
- MPTは,地球の氷河の動態における根本的な変化であり,緩やかな冷却の傾向ではありません.
- MPTを理解することは,長期の氷河期と氷河期間のサイクルを理解するために不可欠です.
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