Possible obliquity-forced warmth in southern Asia during the last glacial stage

• 作者: Cheng Zhao Eelco J.Rohling Zhengyu Liu Xiaoqiang Yang Enlou Zhang Jun Cheng Zhonghui Liu Zhisheng An Xiangdong Yang Xiaoping Feng Xiaoshuang Sun Can Zhang Tianlong Yan Hao Long Hong Yan Zicheng Yu Weiguo Liu Shi-Yong Yu Ji Shen
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（11）
• 所属期刊栏目: ARTICLES
• 页码范围: 1136-1145
• 页数: 10页
• 语种: 英文

摘要

Orbital-scale global climatic changes during the late Quaternary are dominated by high-latitude influenced ～100,000-year global ice-age cycles and monsoon influenced ～23,000-year low-latitude hydroclimate variations.However,the shortage of highly-resolved land temperature records remains a limiting factor for achieving a comprehensive understanding of long-term low-latitude terrestrial cli-matic changes.Here,we report paired mean annual air temperature (MAAT) and monsoon intensity proxy records over the past 88,000 years from Lake Tengchongqinghai in southwestern China.While summer monsoon intensity follows the ～23,000-year precession beat found also in previous studies,we identify previously unrecognized warm periods at 88,000-71.000 and 45,000-22,000 years ago,with 2-3 ℃ amplitudes that are close to our recorded full glacial-interglacial range.Using advanced transient climate simulations and comparing with forcing factors,we find that these warm periods in our MAAT record probably depends on local annual mean insolation,which is controlled by Earth's ～41,000-year obliquity cycles and is anti-phased to annual mean insolation at high latitudes.The coincidence of our identified warm periods and intervals of high-frequent dated archaeological evidence highlights the importance of temperature on anatomically modem humans in Asia during the last glacial stage.