まとめ
南極の氷床の体積流動は,バード・ステーションの近くの均衡率を超えており,かなり薄くなっていることを示唆しています. この氷床の不均衡は,ウィスコンシン/ヴュルム氷河期以降に始まった可能性があり,氷床の安定性に影響を与えています.
科学分野:
- 氷河学 氷河学とは
- 南極大陸の研究研究
- 氷床のダイナミクス
背景:
- 氷床の体積流量の計算は,質量バランスを理解するために重要です.
- 酸素イソトープと掘削孔の温度を用いた以前の研究では,バード・ステーションでの薄めが示唆されていた.
研究 の 目的:
- 氷床の平衡を測るには,体積流と表面積層の速度を比較する.
- 計算された流量と増積の間の不一致を調査するために,南極のバード・ステーションの近く.
主な方法:
- バード・ステーションから地元の氷河まで横断した.
- 横断線に沿った様々な点で平均氷体積の流れを計算した.
- 流量流量データを上流の表面増殖率と比較した.
主要な成果:
- 南極の氷床は,氷河溝の近くで平衡状態にあるようです.
- バード駅の近くでは,計算された氷の体積流動が,均衡に必要な速度を少なくとも15%上回っている.
- この不一致は,氷床の質量の潜在的な不均衡を示唆している.
結論:
- 観測された不均衡の最も可能性が高い説明は,以前の採掘穴データと一致する,進行中の氷床の薄まりである.
- この薄くなる現象は,ウィスコンシン/ヴュルム氷河期以降に始まった可能性が高い.
- この薄くなる原因について,さらなる調査が必要である.
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