パリ協定と南極からの海面上昇
PubMedで要約を見る
まとめ
この要約は機械生成です。地球温暖化を2度に制限することで 南極の氷の急速な消失を防ぐことができます しかし この目標を超えると 氷床が後退し 地球の海面上昇が加速する 危険性があります
科学分野
- 気候科学
- 氷河学
- 海面上昇
背景
- パリ協定は,地球温暖化を工業化以前のレベルより1.5〜2°Cに制限することを目標としています.
- 温室効果ガスの排出は,熱膨張と陸上の氷の損失によって地球平均海面 (GMSL) に大きく影響します.
- 南極の氷床 (AIS) はGMSLに大きく貢献しており,氷の減少が加速し,急速な撤退に脆弱な地域があります.
研究 の 目的
- 南極の氷床の安定性に対するパリ協定の温度目標の影響を調査する.
- 氷床の不可逆的な不安定化を引き起こし,海面上昇を加速させる可能性を評価する.
主な方法
- 観測的に調整された氷床モデルを使用した.
- パリ協定の目標と現在の政策に合致するシナリオを模擬した.
- その結果,南極の氷の減少とGMSLへの貢献を分析した.
主要な成果
- 温暖化を2°C以下に制限すると 現在の速度で南極の氷の減少が続きます
- 2°C (例えば3°C) を超える温暖化は,2060年以降の氷の急増につながり,2100年までにGMSLに年間約0.5cmの貢献をもたらします.
- 氷床の薄まりと喪失は 何世紀にもわたる 氷床の退却を 抑えられないものにしてしまいます 氷床の薄まりと喪失は 何世紀にもわたる 氷床の退却を 抑えられないものにしてしまいます
結論
- パリ協定の目標温度を超えれば,南極の氷の急速で不可逆的な減少が起こる危険性があります.
- この氷の減少は 地球の海面上昇を大幅に加速します
- 南極から海面上昇を防ぐには 気候目標の緊急遵守が不可欠です
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