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東アジアにおける55万年のモンスーン降雨記録
J Warren Beck1,2,3, Weijian Zhou4,5, Cheng Li3
1Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA. wbeck@physics.arizona.edu weijian@loess.llqg.ac.cn.
まとめ
コスモジェニックベリリウム-10 (10Be) 流は55万年以上にわたる東アジアの夏季風 (EASM) の降雨を明らかにする. 北半球の夏の太陽照射に合わせて 降雨量が増えると 半球間の傾きが影響するだけでなく 高緯度の変化も影響する
科学分野:
- 古代気候学
- 地化学
- モンスーン・ダイナミクス
背景:
- コスモジェニクス流は,大気降雨のプロキシとして機能します.
- 過去のモンスーンの変動を理解することは 気候科学にとって極めて重要です
研究 の 目的:
- 東アジア夏季風 (EASM) の長期記録を再構築するには,10Beプロキシを使用します.
- EASMの強度,インソレーション,そして地球上の氷の量の変動との関係を調査する.
主な方法:
- 55万年の歴史を記録した
- 軌道プレセーション周波数と気候プロキシとの相関性に関するBe記録を分析する.
主要な成果:
- 55万年のEASMの降雨記録は 軌道前進の周波数で強引に示しています
- 降雨量の増加は北半球の夏の太陽照射の最大値と相関しているが,寒いインタースタジアムでは水分化されている.
- 中国洞窟 δ18 と異なり,ベモンスーンのプロキシは,地球規模の氷の量変化と強い相関を示している.
結論:
- EASMの強度と中国の洞窟 δ18Oは,主に低緯度の半球間日照度によって支配されます.
- これらのグラデーションは,高北緯度の太陽照射ではなく,モンスーンのダイナミクスを通して,地球上の氷の量に影響を与える可能性があります.
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