Zhao Cheng, Rohling Eelco J, Liu Zhengyu, Yang Xiaoqiang, Zhang Enlou, Cheng Jun, Liu Zhonghui, An Zhisheng, Yang Xiangdong, Feng Xiaoping, Sun Xiaoshuang, Zhang Can, Yan Tianlong, Long Hao, Yan Hong, Yu Zicheng, Liu Weiguo, Yu Shi-Yong, Shen Ji
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China; School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China.
Research School of Earth Sciences, the Australian National University, Canberra ACT 2601, Australia; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK.
Sci Bull (Beijing). 2021 Jun 15;66(11):1136-1145. doi: 10.1016/j.scib.2020.11.016. Epub 2020 Dec 1.
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 climatic 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 °C 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 modern humans in Asia during the last glacial stage.
晚第四纪期间的轨道尺度全球气候变化主要受高纬度影响的约10万年全球冰期循环和季风影响的约2.3万年低纬度水文气候变化的主导。然而，高分辨率陆地温度记录的短缺仍然是全面理解长期低纬度陆地气候变化的一个限制因素。在此，我们报告了来自中国西南部腾冲青海湖过去8.8万年的年平均气温（MAAT）和季风强度代用记录对。虽然夏季风强度遵循了先前研究中也发现的约2.3万年的岁差周期，但我们识别出了8.8万至7.1万年前以及4.5万至2.2万年前之前未被认识到的温暖期，其幅度为2至3摄氏度，接近我们记录的完整冰期 - 间冰期范围。通过使用先进的瞬态气候模拟并与强迫因素进行比较，我们发现我们的MAAT记录中的这些温暖期可能取决于当地的年平均日照，而年平均日照受地球约4.1万年的倾角周期控制，并且与高纬度地区的年平均日照呈反相位。我们识别出的温暖期与高频测年考古证据的时间间隔相吻合，这突出了温度对末次冰期亚洲解剖学上现代人类的重要性。
