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アムンツェン海湾で観測された急激な岩層の上昇は,氷床の安定性を促進する

Valentina R Barletta^1,2, Michael Bevis², Benjamin E Smith³

¹DTU Space, National Space Institute, Geodynamics Department, Technical University of Denmark, Kgs. Lyngby, Denmark. vr.barletta@gmail.com.

Science (New York, N.Y.)

|June 23, 2018

まとめ

アムンセン海湾 (ASE) の急速な氷河同静調整 (GIA) は,西南極氷床 (WAIS) の安定性が過小評価されていることを示唆している. 新しいGPSデータにより岩盤の上昇が加速し GIAの時間軸が短縮されました

科学分野:

地理学
氷河学
気候科学

背景:

アムンセン海峡 (ASE) の西南極氷床 (WAIS) は,世界の海面上昇に大きく寄与し,崩壊のリスクに直面しています.
氷の質量変化に対する岩床の反応である氷河の静止調整 (GIA) は,伝統的に長期のプロセス (10,000年) と考えられていた.

研究の目的:

新しいGPS測定を用いてASEの下のマントルの粘度を調査する.
この脆弱な地域における氷河の静止調整 (GIA) の時間スケールを再評価する.

主な方法:

アムンドセン海湾 (ASE) の岩床の急速な上昇を検出するために,新しいGPS測定を用いた.
観測された上昇率に基づいて,亜ASEマントルの粘度を計算した.

主要な成果:

ASEでは年41mmの異常な速さで上昇した.
世界平均より著しく低いマントルの粘度 (4 x 10^18 Pa·s) を決定した.
推定GIA応答時間軸を千年から世紀に短縮しました.

結論:

GIAは氷の減少に対する岩盤の反応が以前より速いことを示しています
重力データから推定された氷の質量損失を10%向上させる必要がある.
西南極の氷床 (WAIS) は,以前よりも壊滅的な崩壊に対して,潜在的により大きな安定性を示唆しています.

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