ハインリッヒ型気候変動の双極の影響と段階化
Kaden C Martin1, Christo Buizert2, Jon S Edwards2
1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. martkade@oregonstate.edu.
Nature
|April 24, 2023
まとめ
ハインリッヒ現象は 氷床の融水パルスの影響で グリーンランドは冷却されず 南極は温暖化しました 氷河期における 極端な気候に影響を及ぼしたことを示唆しています
科学分野:
- 古代気候学
- 氷床の動態
- 気候 テレコネクション
背景:
- ハインリッヒ現象は,氷河期におけるローレンティド氷床からの極端な氷山流出現象である.
- これらの出来事は,地球上の水学と生地化学のサイクルに大きな影響を及ぼしました.
- 以前の研究では ゲインリッヒ現象と グリーンランドの温度を 関連付けることが困難でした
研究 の 目的:
- グリーンランドと南極における ハインリッヒ現象の地域的な気候影響を調査する.
- ハインリッヒ現象が南極の気候変化に 関連している段階を決定する.
- 気候の変化の原因となる 遠隔接続を理解する
主な方法:
- 温度のプロキシとして,グリーンランド氷のコアの安定した窒素同位体の分析.
- 南極の氷の核の温度とメタンの記録の調査
- ハインリッヒスタジアムにおけるグリーンランドと南極の気候信号の比較.
主要な成果:
- ハインリッヒ現象は,グリーンランドに検出可能な温度影響を及ぼさない.いくつかのハインリッヒ現象の発生時に冷却が発生した.
- 南極の氷の核は ハインリッヒ現象のメタンの増加と並行して 加速された温暖化を示しています
- 南極の温暖化は グリーンランドの冷却を 約133年遅らせて 海洋の遠隔接続を示しています
結論:
- ハインリッヒ事件は,グリーンランドの直接的な気温信号がないにもかかわらず,グリーンランドよりも南極の気候に大きく影響した.
- 海のテレコネクションが ハインリッヒ現象の気候影響を媒介し,北大西洋の氷の放出と南半球の温暖化を結びました
- ハインリッヒ事件の複雑な空間的動態は 局所的な衝撃と遠隔増幅を示唆しています
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