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海圧によって誘発され,静止調整によって調節されるハインリッヒ現象
Jeremy N Bassis1, Sierra V Petersen2, L Mac Cathles1,2
1Department of Climate and Space Science and Engineering, University of Michigan, Ann Arbor, Michigan, USA.
Nature
|February 17, 2017
まとめ
海の温暖化と氷床の動態によって引き起こされました 海の温暖化と氷床の動態によって引き起こされました この研究により 寒い気候の時期の 氷床の出現が説明され 氷床が海洋の温度に 弱いことが明らかになりました
科学分野:
- 古代気候学
- 氷河学
- 海洋学
背景:
- ハインリッヒ事件の際にローレンティド氷床は大きな氷山を放出し,海洋の堆積物の中に残骸を残した.
- これらの現象はダンズガード・オシュガー周期の寒冷期に発生し,氷床の振る舞いの予想とは対照的に発生した.
- この巨大な氷山の放出を 引き起こしたメカニズムは まだ解明されていません
研究 の 目的:
- 氷床モデルを使って ハインリッヒ現象のタイミングと大きさを説明する
- 氷山の流出における 海洋温暖化と氷床の動態を調査する
- ハインリッヒ現象の周期的な性質を,気候の振動に関連して理解する.
主な方法:
- 氷床モデルを使って 氷河の動態をシミュレートした
- 氷河の退却を促す 組み込みプロセスです
- 地下海の温暖化と 静止調整の影響をモデル化しました
主要な成果:
- 地表の海洋温暖化により 氷床の融解が増加し 氷山の流出が急速に進みます
- 氷床が上昇し 氷床の終端が分離され 氷床が上昇します
- このサイクルは,寒い気候の時期と特定の氷床の位置でのハインリッヒ現象の発生を説明します.
結論:
- この研究は ハインリッヒ事件のタイミングと規模を説明するメカニズムを提供します.
- 海洋を覆う氷床は 海洋温暖化によって 壊滅的な崩壊に弱いのです 大気温暖化が最小限であってもです
- このメカニズムは 海洋循環,氷床の動態,そして 千年のスケールの気候変動の 複雑な相互作用を強調しています
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