北太平洋の淡水現象は,氷河の海循環の変化に関連しています
E Maier1, X Zhang2, A Abelmann3
1Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany. edith.maier@awi.de.
Nature
|July 12, 2018
まとめ
北米の氷床からの淡水放出は,北太平洋の塩分と氷河期間の温度に影響を与えました. 海と大気の相互作用がこれらのリンクを調節し,ハインリッヒ・スタディアルの間,気候の変動に影響を与えた.
科学分野:
- 古代海洋学
- 気候科学
- 氷河期動態
背景:
- 氷河期間の海循環と気候に大きな影響を与える.
- 北大西洋の淡水流出事件はハインリッヒ・スタディアルと相関しているが,北太平洋の淡水の歴史は依然として議論されている.
- ハインリッヒ・スタディアル期の北太平洋と北大西洋の気候のつながりを理解することは,過去の気候の変動性を再構築するために不可欠です.
研究 の 目的:
- 北大西洋の循環の変化と北太平洋の淡水排出の関連を調査する.
- 最後の氷河期における 北太平洋地域の淡水の歴史を明らかにする.
- 北大西洋と北太平洋の気候ダイナミクスを結びつける海洋-大気相互作用の役割を決定する.
主な方法:
- 表面海水 δ18Oと塩分を復元するために,過去5万年にわたってダイアトームの安定した酸素同位体 (δ18O) の分析.
- 氷の破片と海面温度記録の調査
- 海洋と大気の相互作用と淡水放出メカニズムをシミュレートするために,同位体対応モデルを使用します.
主要な成果:
- 北太平洋の表面海水 δ18O (23‰) と塩度 (24 PSU) の有意な減少は,ハインリッヒスタジアム1と4で観察された.
- これらの変化は,北東の北太平洋で氷の破片が増加し,海面のわずかな冷却と一致しました.
- 東方赤道太平洋の温暖化が北大西洋の信号を伝達し,ヘインリッヒ・スタジアム1と4の間にコルディレラ氷床の淡水排出を引き起こした.
結論:
- ハインリッヒ・スタジアルの北大西洋循環とコルドレラ氷床からの北太平洋淡水注入の間に強い関連がある.
- 海洋と大気の非線形相互作用は,これらのリンクを調節する上で複雑な役割を果たしました.
- ハインリッヒ・スタディアル3は背景冷却の強化によって特徴づけられ,北太平洋の温暖化を防止し,淡水の排出パターンを変化させ,ハインリッヒ・スタディアル1と4とは異なっていた.
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