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南極の氷の動態は,北半球の海面圧迫によって増幅される
Natalya Gomez1, Michael E Weber2, Peter U Clark3,4
1Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada. natalya.gomez@mcgill.ca.
Nature
|November 26, 2020
まとめ
北半球の海面の変化は南極の氷床 (AIS) の動態を強めた. この半球間相互作用は,氷河期中にAISの量を増やし,脱氷期中に撤退と質量損失を増加させた.
科学分野:
- 古代気候学
- 氷河学
- 海水面の研究
背景:
- 北半球の氷の減少は世界の海面に影響を与え,南極の氷床 (AIS) に潜在的に影響を与える.
- 以前のモデルでは,海平面によるAIS接地線の後退が示唆されていたが,複雑な相互作用は完全に捉えられなかった.
- AISのミレニアムスケールの変動は,最後の脱氷期間の外部海面強制を支えています.
研究 の 目的:
- 北半球の海面圧迫による南極氷床 (AIS) の増幅ダイナミクスを調査する.
- AISの接地線行動に影響を与える複雑な半球間相互作用をモデル化する.
- モデル化されたAISの振る舞いを地質学的再構築と古気候データと調和させる.
主な方法:
- 氷床モデルと世界の海平面モデルを組み合わせる
- 北半球の海面圧迫シナリオでAISのダイナミクスをシミュレートする.
- AISの範囲と海面の変化の地質学的証拠とモデル出力を比較する.
主要な成果:
- 北半球の海面圧力はAISの動態を大きく増幅する.
- 半球間相互作用は,氷河期中に地平線の前進と質量増強につながります.
- 北半球の急速な海平面上昇は,脱氷期における早期の接地線後退と質量損失を引き起こし,千年規模の変動を引き起こします.
結論:
- この研究は,北半球の海平面の強制が AIS の振る舞いを調節する上で重要な役割を果たしていることを確認しています.
- 氷河期間のサイクルと 南極の氷床の進化の理解を 洗練しています
- 発見は地質学的な記録と一致し 半球間の複雑な相互作用が 氷床の変化を促していることを示しています
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