暖かいプール 海の熱含有量は,海と大陸の水分輸送を調節する
Zhimin Jian1, Yue Wang2, Haowen Dang3
1State Key Laboratory of Marine Geology, Tongji University, Shanghai, China. jian@tongji.edu.cn.
Nature
|October 19, 2022
まとめ
インド太平洋温水池 (IPWP) の海洋熱含有量は,地球温暖化に影響する. 軌道内照射の変化は,IPWP上部海洋熱含有量 (OHC) の変動を誘導し,モンスーンの水気気候サイクルを36万年にわたって増幅します.
科学分野:
- 古代気候学
- 海洋学
- 気候の動態
背景:
- インド太平洋温暖化プール (IPWP) は,水蒸気と潜在的熱の放出により,地球温暖化に大きな影響を与える.
- IPWP上の海洋熱含有量 (OHC) は現代の気候変動と関連しているが,その長期的変動と水気気候の影響は十分に調査されていない.
研究 の 目的:
- 過去36万年にわたるIPWP上部OHCの長期変動を調査する.
- IPWP OHC,軌道内太陽化,モンスーンの水候との関係を理解する.
- 海と大陸の水循環を 増幅するメカニズムを探る
主な方法:
- 地化学のプロキシと 暫定的な気候シミュレーションを組み合わせた
- 分析されたIPWP上部 (0-200m) のOHCは36万年にわたって変化している.
- アイソトープ対応の 空気-海結合モデルを使いました
主要な成果:
- 過去36万年にわたるIPWP上部OHCの変動は,メリディアン内照度グラデーションと相関する支配的なプレセッションと弱い傾斜サイクルを示しています.
- OHCの減少の30%から40%は氷の量変化に起因する.
- より高いプレセッショナル上のOHCは,IPWP表面水の酸素同位体濃縮と,東アジアの降水量の減少と相関しています.
結論:
- IPWP上部のOHCの変動は,軌道内太陽化によって引き起こされ,プレセッショナル時間尺度で海洋大陸の水循環を拡大します.
- 表面温度よりもOHCの変動が,湿度と潜在熱の収束によるこの増幅の主要な要因です.
- 軌道上の時間スケールにおける地球水気気候の調節には,インソレーションによって調節される上部OHCとモンスーンの変動の結合が不可欠である.
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