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氷河の冷却と気候感受性の再検討
Jessica E Tierney1, Jiang Zhu2,3, Jonathan King4
1Department of Geosciences, University of Arizona, Tucson, AZ, USA. jesst@arizona.edu.
Nature
|August 28, 2020
まとめ
最新の氷河期 (Last Glacial Maximum,LGM) は -6.1°Cの地球温暖化がありました 温室効果ガスや氷床への地球の反応の理解を 洗練したものです
科学分野:
- 古代気候学
- 気候モデリング
- 地化学
背景:
- 最後の氷河期 (Last Glacial Maximum,LGM) は,気候の動態を理解するための重要な間隔です.
- 過去の研究では,プロキシデータの制限により,包括的なLGM気候状態を再構築する際に課題に直面しました.
研究 の 目的:
- LGMの温度を再構築する.
- グローバル平均のLGMの冷却と均衡の気候感受性を制限する.
主な方法:
- イソトープ対応の気候モデル・アンサンブルを組み合わせた地化学的な海面温度プロキシ.
- 温度を再構築するためにデータアシミレーション技術を使用しました.
- 独立プロキシと古気候データで再構築を検証した.
主要な成果:
- LGMの温度を再構築した.
- 制限されたグローバル平均LGMの冷却は -6. 1°C (95%CI: -6. 5から -5. 7°C)
- 3.4°C (2.4-4.5°C) の均衡気候感度が推定され,コンセンサス範囲に準拠している.
結論:
- この研究は,データで同化されたLGMの温度再構築を提供します.
- この発見は 将来の気候予測に不可欠な 気候感受性の見積もりを 精査するものです
- この研究は 気候モデルと多様なプロキシデータを統合する価値を強調しています
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