工業化後の北極の温暖化に反応するグリーンランドの流れの非線形上昇
Luke D Trusel1,2, Sarah B Das3, Matthew B Osman4
1Department of Geology, Rowan University, Glassboro, NJ, USA. trusel@rowan.edu.
Nature
|December 7, 2018
まとめ
最近のグリーンランド氷床の融解は 過去350年で例外的なものです この研究は 過去の融解率を再構築し,産業時代の温暖化による最近の融解が自然変動を上回ることを示しています
科学分野:
- * 気候科学
- * 氷河学
- * 古代気候学
背景:
- グリーンランドの氷床 (GrIS) は,世界の海面上昇に大きく貢献しています.
- * 表面の溶けた水の流れは,最近の氷の質量損失の主な要因です.
- * 過去の融解の変動,強度,流出は衛星時代以前に不確実である.
研究 の 目的:
- GrISの表面の融解強度と流出について,最初の連続した,多世紀間の,観察的に制限された記録を確立する.
- * 少なくとも過去350年にわたって最近のGISの溶解の例外性を評価する.
- * 過去の氷床スケールの表面溶けと流出を再現する.
主な方法:
- * グリーンランド中央西部の氷核のストラティグラフィック分析
- * 過去の融解率の定量化には,流出ゾーンの氷の核の融解層の再凍結を用いる.
- * 氷の核の融解記録とモデル化された融解速度と衛星による融解期間を相関させる.
主要な成果:
- 最近のGRISの融解は,少なくとも過去350年にわたって例外的なものです.
- * 氷の核の融解記録は,モデル化および衛星による融解データと有意な相関関係を示しています.
- GrISの融解は北極の温暖化に伴い1800年代半ばに始まったが,その規模は最近自然変動を超えた.
結論:
- * 氷核の融解層は,過去の融解速度を再構築するための信頼できる方法を提供します.
- 最近のグライス溶融の規模は 過去350年で前例のないものです
- * 温暖化が続くと,非線形的な溶融反応によるグライス流出と海面上昇が加速する.
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