最後の氷河期以来の地球全体の表面温度
PubMedで要約を見る
まとめ
この要約は機械生成です。氷床,温室効果ガス,海洋循環,日焼けによる 気温の変動が 24,000年以上に渡る 気候の変化を明らかにしています 現代の温暖化は この古気候記録と比較して 速さも規模も前例のないものです
科学分野
- 古気象学と地球システム科学
- 気候モデリングとデータ同化
背景
- 過去の気候の変動を理解することは 将来の地球システムの反応を 予測するのに不可欠です
- 気候モデルとプロキシデータを用いた以前の研究では 過去の気候変化について 矛盾する結論が得られました
研究 の 目的
- 過去2万4千年の 表面温度の変化を 再度分析したものです
- この期間の気温変動を促す 主要な気候メカニズムを特定する.
- 最近の温暖化傾向と 長期の古気候変化を比較するためです
主な方法
- 気候モデルシミュレーションとプロキシデータを組み合わせるために,古気候データの同化が使用されました.
- 表面温度変化の200年解像度再分析が生成された.
- 分析は氷床と温室効果ガスの放射力強迫と 海洋循環と太陽照射の変化に焦点を当てた.
主要な成果
- 温度の変動は主に放射力強迫と海洋/太陽熱の変化によって引き起こされた.
- 世界平均気温はホロセンの初期から約0.5°C上昇しています.
- 過去2万4千年に比べ 現代温暖化の速度と規模は前例のないものです
結論
- この研究は過去2万4000年にわたる 気候変動に関する 統一された見解を示しています
- 現代の温暖化は,長期的な古気候の文脈で見ると,速度と規模の両方において例外的です.
- この研究は現在の気候の傾向が 自然の変動から大きく逸脱していることを示しています
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