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過去22万4000年にわたる東アジアモンスーンのミレニアム・スケール・オービタル・スケールの変化
Yongjin Wang1, Hai Cheng, R Lawrence Edwards
1College of Geography Science, Nanjing Normal University, Nanjing, Jiangsu 210097, China. yjwang@njnu.edu.cn
Nature
|February 29, 2008
まとめ
サンバオ洞窟からの新しい酸素同位体記録は,東アジアのモンスーンの強さを22万4000年以上にわたって明らかにしています. モンスーンのサイクルは北半球の夏の太陽照射と一致し,氷河期はミレニアムスケールのモンスーンイベントに影響を与えます.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 気候変動のダイナミクス
- スピレオテムは科学を学んでいる.
背景:
- 中国からのスプレオテム記録は,東アジアのモンスーンの強さについての洞察を提供します.
- 不完全なモンスーンの歴史記録は,軌道および千年スケールの気候変動の理解を妨げています.
- 過去の記録のギャップは,モンスーン制御要因と地域間の気候関係に関するテストを制限しています.
研究 の 目的:
- 中央中国のサンバオ洞窟から抽出した,絶対日付の酸素同位体記録を提示する.
- 東アジアのモンスーンの強さの22万4000年の記録を完了するために.
- 軌道スケールの制御とミレニアムスケールのモンスーンイベントのダイナミクスを調査するために.
主な方法:
- 高解像度スペレオテム分析. 高解像度スペレオテム分析.
- 中央中国のサンバオ洞窟からの酸素同位体分析.
- 絶対年代測定は,正確な年代順を確立するためのテクニックです.
主要な成果:
- 東アジアのモンスーンの強さの連続22万4000年の記録が確立されました.
- 主要な23,000年周期は,北半球の夏の太陽照射と相関し,軌道強制を支えている.
- ミレニアムスケールの強い夏季季風 (中国のインタースタジアル) のイベントは,氷河の蓄積の間に変化した頻度と期間を示し,氷床の大きさに関連しています.
結論:
- 熱帯/亜熱帯のモンスーンは,北半球の夏の太陽照射に軌道時間尺度で直接反応する.
- 氷床の大きさは,氷河期間のミレニアム規模のモンスーンイベントの性格とペースに影響を与えます.
- よく制限されたイベント年齢は,古気候記録の相関と校正のための潜在的なベンチマークを提供します.
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