Northern hemisphere ice sheet expansion intensified Asian aridification and the winter monsoon across the mid-Pleistocene transition
Northern hemisphere ice sheet expansion intensified Asian aridification and the winter monsoon across the mid-Pleistocene transition
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DOI：
10.1038/s43247-023-00686-9
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发表时间：
2023-02
影响因子：
7.9
通讯作者：
H. Ao;E. Rohling;Xinzhou Li;Yougui Song;A. Roberts;Yongming Han;C. Poulsen;T. Jonell;D. Liebrand-D
中科院分区：
文献类型：
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作者：
H. Ao;E. Rohling;Xinzhou Li;Yougui Song;A. Roberts;Yongming Han;C. Poulsen;T. Jonell;D. Liebrand-D
125万年前至60万年前的中更新世过渡标志着全球气候周期从4.1万年到10万年左右的重大转变，而没有伴随轨道强迫的转变。本文结合中国黄土高原过去160万年的粒度和磁化率记录，结合环流模式模拟，研究了与中更新世过渡开始和中期两次极端冰川黄土粗化事件相关的亚洲气候动力学。我们发现，这两个极端冰川事件反映了亚洲干旱化和冬季季风活动的异常增强。它们分别与125万年前和90万年前北半球显著的冰川冰盖扩张相吻合，当时10万年周期开始和加剧。我们的研究结果表明，这些异常干燥和多风的亚洲冰川可能是由北半球冰盖同步扩张的陆地气候响应放大所驱动的。
The mid-Pleistocene transition 1.25 to 0.6 million years ago marked a major shift in global climate periodicity from 41,000 to around 100,000 years without a concomitant orbital forcing shift. Here, we investigate Asian climate dynamics associated with two extreme glacial loess coarsening events at the onset and middle of the mid-Pleistocene transition by combining new and existing grain size and magnetic susceptibility records from the Chinese Loess Plateau spanning the last 1.6 million years with general circulation model simulations. We find that the two extreme glacial events reflect exceptionally enhanced Asian aridification and winter monsoon activity. They coincided with notable Northern Hemisphere glacial ice sheet expansion at 1.25 and 0.9 million years ago when the 100,000-year periodicity initiated and intensified, respectively. Our results indicate that these anomalously dry and windy Asian glacials were probably driven by an amplified terrestrial climate response to the coincident Northern Hemisphere ice sheet expansion.