氷河下の排水システムの垂直拡張は,基礎裂け目への基礎裂け目になります
Joel T Harper1, John H Bradford, Neil F Humphrey
1Department of Geosciences, University of Montana, Montana 59812, USA. joel@mso.umt.edu
Nature
|October 1, 2010
まとめ
亜氷河水は,氷河の奥深くに広がる基礎裂け目を埋めて,貯水量を大幅に増加させることができます. この発見は,氷河の滑りと海面上昇の予測に関する私たちの理解に影響を与えます.
科学分野:
- 氷河学 氷河学とは
- 水文学 水文学とは,水文学の学問である.
- 地球科学 地球科学 地球科学
背景:
- 氷河の基礎滑りには,亜氷河水が大きく影響する.
- 氷河下の水の範囲を理解することは,観測上の課題によって制限されています.
- 氷のダイナミクスの正確なシミュレーションは,海面上昇の予測に不可欠です.
研究 の 目的:
- 氷河下の水の構成と量を調査する.
- 氷床下水が氷床界面の向こうの特徴を占有しているかどうかを判断する.
- 氷河の動態と海面上昇への影響を評価する.
主な方法:
- アラスカのベンチ氷河でレーダーと地震画像を用いた.
- 採掘穴の測定を in situ で行いました.
- 水で満たされた基礎裂け目を特定し,定量化するためにデータを分析しました.
主要な成果:
- 数多くの水で満たされた基礎裂け目を発見し,氷の中に数十メートルを伸ばしました.
- 床に横たわる10cmの層に相当する裂け目における量的な水量.
- 裂け目と氷河床の間の高度に伝染性の高い接続が確認されました.
結論:
- 氷床下水文系は,基礎裂け目を通って,上層の氷に大きく広がることができます.
- 基礎裂けは,貯水能力を高め,氷河下の水圧を調節することができます.
- この発見は,氷河と氷床の亜氷河水文モデルの再評価を必要とする.
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