中国中部高山湖泊记录的小冰期水热配置不同模态  

Different modes of hydrothermal configuration recorded in alpine lakes of central China during the Little Ice Age

作　　者：牛丽丽 张青 陈林 张姚 吴铎[1] 周爱锋[1] NIU Lili;ZHANG Qing;CHEN Lin;ZHANG Yao;WU Duo;ZHOU Aifeng(MOE Key Laboratory of Western China’s Environmental Systems,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,兰州730000

出　　处：《地球环境学报》2023年第3期315-327,共13页Journal of Earth Environment

基　　金：国家自然科学基金项目(42171153,41771208);第二次青藏高原综合科学考察研究(2019QZKK0601)。

摘　　要：小冰期水热配置模态在中国南北方存在明显差异,敏感响应于气候变化的高山湖泊在小冰期阶段水热变化模式仍缺乏研究。选取中国中部两个高山湖泊——太白山玉皇池与六盘山东海子的沉积物岩心为研究对象,基于总有机碳(TOC)、总有机氮(TN),碳氮比(C/N)等地球化学指标,并结合已发表的水文数据,重建了东海子和玉皇池近2 ka来的水热变化模态。结果显示:近2 ka气候变化主要受太阳辐射影响,在900 AD之前,两个湖泊区域气候同为冷湿,中世纪暖期(900—1300 AD)转为暖干;在小冰期(1300—1800 AD)时期水热组合不同,东海子降水与温度呈同步下降趋势,主要受控于东亚夏季风,而处于东海子东南方向的玉皇池表现为降水的持续增加,可能受加强的印度季风和厄尔尼诺-南方涛动(ENSO)的共同影响。Background,aim,and scope The Little Ice Age is a typical climatic event in the last 2 ka,and its hydrothermal configuration patterns differ markedly between southern and northern China.There is still a lack of research in the modes of hydrothermal change in alpine lakes that sensitive to climate change during the Little Ice Age and different geographical lakes about the hydrothermal configuration modes remain poorly understood.Based on the study of the climate change process of two alpine lakes in different geographical locations over the past 2 ka,this paper discusses the similarities and differences of the hydrothermal configuration modes and the possible driving mechanism during the Little Ice Age.Materials and methods In this study,sediment cores from two alpine lakes in central China,Yuhuangchi in the Taibai Mountain and Donghaizi in the Liupan Mountain were selected.By comparing index of the total organic carbon(TOC),total organic nitrogen(TN),carbon and nitrogen ratio(C/N)with published temperature and hydrological records in the area,we discussed the reliability of TOC and TN for indicating temperature variation,and reconstructed the hydrothermal patterns of Donghaizi and Yuhuangchi over the last 2 ka.Results The climate change during the last 2 ka were mainly influenced by total solar radiation,with the climate of both lakes being cold and wet until 900 AD,and turning warm and dry during the Medieval Warm Period(900—1300 AD);the hydrothermal combination was different during the Little Ice Age(1300—1800 AD),with Donghaizi showing a synchronous decline in precipitation and temperature,while Yuhuangchi,which is located in the southeast of Donghaizi,showing an increase in precipitation.These two alpine lakes in different geographical locations showed different modes of hydrothermal configuration during the Little Ice Age.Discussion The decreased trend of Donghaizi precipitation during the Little Ice Age is consistent with the precipitation changes reconstructed by pollen in the north China,indicating it

关 键 词：高山湖泊 小冰期 水热配置 太阳辐射 

分 类 号：P467[天文地球—大气科学及气象学] P343.3