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1985年から2022年までのグリーンランドの氷床の断層の加速
Chad A Greene1, Alex S Gardner2, Michael Wood3
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. cgreene@jpl.nasa.gov.
Nature
|January 17, 2024
まとめ
グリーンランド
科学分野:
- 氷河学
- 気候科学
- 地球システム科学
背景:
- グリーンランドの氷河は薄まり 引き下がり 世界海面上昇に寄与しています
- 氷床の縮小は 氷床の質量バランスと 地球の気候に大きな影響を及ぼします
- 端末の変化を理解することは 気候変動の影響の正確な評価に不可欠です
研究 の 目的:
- グリーンランドの氷床の質量バランスへの影響を定量化するために
- グリーンランドの氷床の長期間データセットを 高解像度で生成する.
- 現在の気候モデルにおける質量損失の過小評価を評価する.
主な方法:
- 手動と人工知能による結末観測 (1985年−2022年) の組み合わせ
- 毎月120mの解像度で氷床の範囲をマスクする.
- カルビングフロントの後退による分析面積と体積損失
主要な成果:
- グリーンランドの氷床は1985年以来,5,091 km2の面積と1,034 Gtの氷を失った.
- 現在の質量平衡の推定では20%まで過小評価されています.
- 季節的後退 (年間193 km2/63 Gt) は,氷河の感度を示唆する多十年的後退と相関する.
結論:
- グリーンランドの氷の減少には 重要で過小評価されている要因です
- 季節的な終点の変動は 氷河の長期的気候変動に対する感受性を予測できます
- 正確な質量バランス評価には,分娩前部のダイナミクスを組み込む必要があります.
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