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ローレンチド氷床の脱氷期における氷河流の活動が氷床の量にスケールされる
C R Stokes1, M Margold1, C D Clark2
1Department of Geography, Durham University, Durham, UK.
Nature
|February 19, 2016
まとめ
古代のローレンチド氷床の氷河の流れは 時間の経過とともに数値と排出量が減少しました これは氷河流が 氷床の質量バランスに 以前に考えられていたより 少ない影響を与える可能性があることを示唆しています
科学分野:
- 古代気候学
- 氷河学
- 氷床の動態
背景:
- グリーンランドと南極の氷床は 氷河の薄まりと後退により 海面上昇に大きく貢献しています
- 将来の海面上昇を予測する不確実性は,氷河の流れの行動に関する限られた長期データから生じています.
- 氷河の流れの進化を理解することは 氷床の質量バランスの正確な予測に不可欠です
研究 の 目的:
- ローレンチド氷床の脱氷期における 氷河の流れの歴史を再現する
- 氷河の流れのネットワークが 何千年にも渡って どのように進化したかを調べるため
- 氷河流が氷床の質量バランスに 長期的に与える影響を評価する
主な方法:
- ローレンチド氷床の脱氷期 (2万2000万年前) の117の氷河流の活動を再構築.
- 氷の流れの数,空間的な範囲,時間経過による排出の分析.
- 氷河流の活動と基礎の地質,地形,氷床の体積の変化の相関.
主要な成果:
- 活動的な氷河の数はローレンチド氷床の退去とともに減少した.
- 氷河の流れは 氷床の周囲の 割合が小さくなってきています
- 氷河流から排出される氷の総量は,脱氷期中に減少した.
結論:
- 氷の流れの活動と排水網は 氷床の容量の変化に合わせて調整されています
- いくつかの理論に反して,氷河流は,脱氷の間,ローレンチド氷床の質量バランスに徐々に影響を及ぼした.
- 発見は現代の氷床の動力学に 洞察を与えるかもしれませんが 直接的な翻訳には 慎重さが求められます
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