Mid-Pleistocene climate transition triggered by Antarctic Ice Sheet growth

• 成果类型: Article
• 署名作者: An, Zhisheng; Zhou, Weijian; Zhang, Zeke; Zhang, Xu; Liu, Zhonghui; Sun, Youbin; Clemens, Steven C.; Wu, Lixin; Zhao, Jiaju; Shi, Zhengguo; Ma, Xiaolin; Yan, Hong; Li, Gaojun; Cai, Yanjun; Yu, Jimin; Sun, Yuchen; Li, Siqi; Zhang, Yu'ao; Stepanek, Christian; Lohmann, Gerrit; Dong, Guocheng; Cheng, Hai; Liu, Yu; Jin, Zhangdong; Li, Tao; Hao, Yifei; Lei, Jing; Cai, Wenju
• 署名单位: Chinese Academy of Sciences; Institute of Earth Environment, CAS; Xi'an Jiaotong University; Beijing Normal University; Nanjing University; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC British Antarctic Survey; University of Hong Kong; Brown University; Laoshan Laboratory; Ocean University of China; Australian National University; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research; Chinese Academy of Sciences
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9176
• DOI: 10.1126/science.abn4861
• 发表日期: 2024-08-02
• 页码: 560-565
• 关键词: carbon-dioxide concentration; sea-surface temperatures; last glacial maximum; southern-ocean; north-atlantic; chinese loess; boron isotope; circulation changes; record; variability

摘要

Despite extensive investigation, the nature and causes of the Mid-Pleistocene Transition remain enigmatic. In this work, we assess its linkage to asynchronous development of bipolar ice sheets by synthesizing Pleistocene mid- to high-latitude proxy records linked to hemispheric ice sheet evolution. Our results indicate substantial growth of the Antarctic Ice Sheets (AISs) at 2.0 to 1.25 million years ago, preceding the rapid expansion of Northern Hemisphere Ice Sheets after similar to 1.25 million years ago. Proxy-model comparisons suggest that AIS and associated Southern Ocean sea ice expansion can induce northern high-latitude cooling and enhanced moisture transport to the Northern Hemisphere, thus triggering the Mid-Pleistocene Transition. The dynamic processes involved are crucial for assessing modern global warming that is already inducing asynchronous bipolar melting of ice sheets.