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

地球倾角驱动的末次冰期期间南亚地区变暖

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 HaoLong Hong Yan Zicheng Yu Weiguo Liu Shi-Yong Yu Ji Shen 赵成;Eelco J.Rohling;Zhengyu Liu;杨小强;张恩楼;程军;Zhonghui Liu;安芷生;羊向东;冯小平;孙晓双;张灿;闫天龙;隆浩;晏宏;Zicheng Yuk;刘卫国;于世永;沈吉(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 SO143ZH,UK;Department of Geography,Ohio State University,Columbus 43210,USA;Department of Earth Sciences,Sun Yat-sen University,Guangzhou 510275,China;Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,China;Department of Earth Sciences,University of Hong Kong,Hong Kong 999077,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China;Department of Earth and Environmental Sciences,Lehigh University,Bethlehem 18015,USA;Institute for Peat and Mire Research,School of Geographical Sciences,Northeast Normal University,Changchun 130024,China;School of Geography,Geomatics,and Planning,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China [2]Center for Excellence in Quaternary Science and Global Change,Chinese Academy of Sciences,Xi’an 710061,China [3]School of Geography and Ocean Science,Nanjing University,Nanjing 210023,China [4]Research School of Earth Sciences,the Australian National University,Canberra ACT 2601,Australia [5]Ocean and Earth Science,University of Southampton,National Oceanography Centre,Southampton SO143ZH,UK [6]Department of Geography,Ohio State University,Columbus 43210,USA [7]Department of Earth Sciences,Sun Yat-sen University,Guangzhou 510275,China [8]Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,China [9]Department of Earth Sciences,University of Hong Kong,Hong Kong 999077,China [10]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China [11]Department of Earth and Environmental Sciences,Lehigh University,Bethlehem 18015,USA [12]Institute for Peat and Mire Research,School of Geographical Sciences,Northeast Normal University,Changchun 130024,China [13]School of Geography,Geomatics,and Planning,Jiangsu Normal University,Xuzhou 221116,China

出　　处：《Science Bulletin》2021年第11期1136-1145,M0004,共11页科学通报（英文版）

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences(XDB40010200 and XDA2009000004);the Program of Global Change and Mitigation;Ministry of Science and Technology of China(2016YFA0600502);the National Natural Science Foundation of China(41877293,41672162,41977381,and 41472315)。

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 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℃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.当前对晚第四纪以来轨道尺度上地球气候变化的认识,主要包括高纬驱动的以~10万年周期为主的冰期-间冰期循环和夏季风影响的以~2.3万年周期为主的低纬水文变化.但是,由于低纬陆地没有较为可靠的温度记录,使得对低纬陆地的长期气候变化仍然缺乏全面的理解.本文通过获取云南腾冲青海的一根湖泊沉积岩芯,分析了沉积物中的支链甘油二烷基甘油四醚酯(brGDGTs)和叶蜡氢同位素,分别重建了~9万年以来南亚地区的年平均温度和季风降水的变化序列.结果表明,夏季风降水与之前的研究一致,表现出明显的2.3万年周期,但是年均温度记录揭示了8.8~7.1万年和4.5~2.2万年存在两个暖期,温度变幅2~3℃,与该记录中的冰期-间冰期变幅接近.通过对比TraCE21ka瞬态模拟结果和相关气候驱动因子,发现这两个暖期很可能受当地的年均太阳轨道辐射影响;而低纬地区的年均太阳辐射由以~4.1万年周期为主的地球倾角变化控制,并与高纬地区的年均太阳轨道辐射呈反向关系.此外,该记录中的两个暖期与古人类活动的年代有较强的相关性,表明末次冰期内温度变化可能对亚洲地区古人类的生存有重要的影响.

关 键 词：Southern Asia Lake sediments brGDGTs Annual temperature The last glacial stage Obliquity forcing 

分 类 号：P532[天文地球—古生物学与地层学]