Hydroclimatic variations in the Tianshan Mountains based on grain size and geochemistry of core sediments since~1490 CE  

作　　者：LAN Bo XU Wen-feng YANG Yun-peng CHEN Xiang-le LIU Zheng-xue ZHANG Dong-liang 

机构地区：[1]Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir,Chongqing Three Gorges University,Chongqing,404100,China [2]College of Geography and Environmental Science,Henan University,Kaifeng,475004,China [3]Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,830011,China

出　　处：《Journal of Mountain Science》2023年第4期1010-1025,共16页山地科学学报（英文）

基　　金：financially supported by the National Natural Science Foundation of China(No.41902024;U1203821L08);the Chongqing Science and Technology Commission(cstc2019jcyjmsxmX0656);the Talent Introduction Program of Chongqing Three Gorges University(17RC08);the Research Center for Sustainable Development of the Three Gorges Reservoir Area(18sxxyjd12);the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2022447)。

摘　　要：Numerous studies have focused on modern hydroclimate and the modulated mechanisms in the Tianshan Mountains(TMs),arid central Asia.However,the detailed information of hydroclimatic processes beyond the instrumental period is still scarce.This paper reconstructed a hydrology history from core sediments of the Dalongchi Lake in the Tianshan Mountains.The comparability between endmembers(EMs)of grain size and ICP-AES based geochemical elements in the lake sediments highlighted their availability for hydrological reconstructions.Hydrodynamic forces(EM1,EM4,Ti/Al and Li/Al),chemical weathering intensity[(Mg+Ca+K)/Al],salinity proxy(Mg/Ca)and redoxsensitive proxy(Fe/Mn)highly correlated with the first principal component(P<0.01),whereas paleoproductivity proxies(TN,TOC,Ba/Al,Zn/Al and Cu/Al)and C/N showed high loadings on the second principal component(P<0.05).The inferred hydrology progress was nonlinearly responded to temperature,precipitation and climate-dictated glaciers.Specifically,the water level didn’t always covary with the humidity because of glaciers.The maximum water level was the comprehensive result of glaciers melting and high humidity around 1830 CE.Thereafter,water level continually decreased with declining moisture at high temperature,implying a limited buffering capacity of glaciers in the Dalongchi Lake basin.EM3-indicated eolian activity intensity was caused by the behaviors of Siberian High because the latter intensified surface wind and the dust transportation.The hydrothermal patterns were characterized by warm/dry and cold/wet alternations in a long run although warm/wet pattern was identified from a short-term view.

关 键 词：Dalongchi Lake PALEOHYDROLOGY End-members Central Tianshan Mountains GEOCHEMISTRY Trace metal 

分 类 号：P339[天文地球—水文科学]