Ice-volume and insolation influences on hydroclimate changes in central eastern China during the antepenultimate glacial period  

作　　者：Quan WANG Shayue YUAN Yijia LIANG Kan ZHAO Qingfeng SHAO Zhenqiu ZHANG Junji ZHU Xinggong KONG Yongjin WANG Jianghu LAN Hai CHENG Chengwei XIA Yi LI 

机构地区：[1]School of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China [2]Chongqing Key Laboratory of Wetland Science Research of the Upper Reaches of the Yangtze River,Chongqing 401331,China [3]School of Geographical Science,Nantong University,Nantong 226007,China [4]Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,School of Geography,Nanjing Normal University,Nanjing 210023,China [5]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China [6]Institute of Global Environmental Change,Xi’an Jiaotong University,Xi’an 710054,China

出　　处：《Science China Earth Sciences》2023年第1期71-79,共9页中国科学（地球科学英文版）

基　　金：supported by the National Nature Science Fundation of China(Grant Nos.42002200&42071105);the Open Fund for the State Key Laboratory of Loess and Quaternary Geology(Grant No.SKLLQG1922);the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJQN201900536);the Chongqing Nature Science Fund(Grant No.cstc2020jcyj-msxm X0598)。

摘　　要：The rainfall changes in East Asian summer monsoon(EASM)regions on the orbital timescale remain controversial due to the lack of reliable rainfall records.Here,we present new multiproxy records(δ^(18)O,δ^(13)C,Sr/Ca and Mg/Ca)of a230Thdated stalagmite from Hulu Cave in central eastern China.Multiproxy records reconstruct a regional hydroclimate history from 340 to 261 kyr BP(thousand years before present),approximately covering the antepenultimate glacial period.Theδ^(18)O record is dominated by the precessional cycles,suggesting that EASM responds to changes in Northern Hemisphere summer insolation(NHSI)on the orbital timescale.Significant correlations amongst theδ^(13)C,Sr/Ca and Mg/Ca suggest that a common factor,i.e.,the local hydrological cycle,controlled their variability,and their leading principal component can be used as a proxy linked to regional rainfall.This composite record bears a good similarity to those from the Chinese Loess Plateau,showing a gradually decreasing rainfall during the antepenultimate glacial period,consistent with changes in global ice volume.Superimposed on the long-term trend,three relative wetter intervals were responding to the higher NHSI periods,suggesting that EASM rainfall variability was induced by integrated effects of global ice volume and NHSI.The increased ice sheets and lower NHSI resulted in an increased meridional temperature gradient and southward shift of the westerlies,which shortened the duration of Meiyu and midsummer rainfall.The differences between the rainfall record and the stalagmiteδ^(18)O record indicate that the latter represents the overall EASM intensity linked to monsoon circulation,but does not directly reflect the rainfall changes at the cave sites.

关 键 词：Hulu Cave Stalagmite records Antepenultimate glacial period East Asian summer monsoon rainfall 

分 类 号：P339[天文地球—水文科学]