青藏高原南部宁金岗桑冰芯可溶性离子记录的环境信息  

Environment information encoded in major ion concentrations in the Noijin Kangsang ice core of the southern Qinghai-xizang Plateau

作　　者：戚伟焕 李真 王佳佳 QI Weihuan;LI Zhen;WANG Jiajia(Northwest Institute of Ecological Environment and Resources,Chinese Academy of Sciences,State Key Laboratory of Cryosphere Science,Lanzhou,Gansu,China;University of Chinese Academy of Sciences,Beijing,China;Institute of Tibetan Plateau,Chinese Academy of Sciences,Beijing,China)

机构地区：[1]中国科学院西北生态环境资源研究院,冰冻圈科学国家重点实验室,甘肃兰州 [2]中国科学院大学,北京 [3]中国科学院青藏高原研究所,北京

出　　处：《北京师范大学学报（自然科学版）》2024年第4期574-582,共9页Journal of Beijing Normal University(Natural Science)

基　　金：第二次青藏高原综合科学考察研究资助项目(2019QZKK0201);中国科学院战略性先导科技专项资助项目(Y82CG61001)。

摘　　要：2007年在青藏高原南部宁金岗桑冰川积累区钻取了一支长55 m的透底冰芯,其年层跨度为1864−2006年.利用正交经验函数分解(EOF)和大气环流场分析等方法对冰芯中可溶性离子(Ca^(2+)、NH_(4)^(+)、Na^(+)、Mg^(2+)、K^(+)、NO_(3)^(-)、SO_(4)^(2-)、Cl^(−))的变化特征和来源进行了研究.结果显示:宁金岗桑冰芯可溶性离子质量浓度变化高度一致,南亚北部干旱、半干旱区的陆地矿物粉尘是冰芯中可溶性离子的主要来源,其变化受西风环流强弱控制;1864−1922和1950−1970年期间,冰芯离子质量浓度较高,与北半球气候寒冷期和较强的西风环流相对应.在冰芯涵盖时段内,冰芯离子质量浓度总体呈减小趋势,显示西风环流整体减弱.A 55 m long ice core was drilled from the Noijin Kangsang glacier on the southern Qinghai-xizang Plateau in 2007.The ice core was drilled close to bedrock and annually dated covering the period of 1864-2006.The concentrations of major soluble ions(Ca^(2+)、NH_(4)^(+)、Na^(+)、Mg^(2+)、K^(+)、NO_(3)^(-)、SO_(4)^(2-)、Cl^(−))in the ice core were measured,ion concentration variations and ion sources were analyzed by empirical orthogonal function(EOF)and atmospheric circulation field analysis.The variations of soluble ion concentrations in the ice core are found to be highly consistent and correlated.The land mineral dust in the arid and semi-arid regions of northern South Asia is the main source of soluble ions,variations in concentration are controlled by westerly circulation.Higher ice core ion mass concentrations during the periods 1864-1922 and 1950-1970 correspond to colder periods of Northern Hemisphere climate and stronger westerly circulation.During the time period covered by the ice cores,there is an overall decreasing trend in ice core ion mass concentrations,indicating an overall weakening of the westerly circulation.

关 键 词：青藏高原 冰芯 离子 西风环流 

分 类 号：P467[天文地球—大气科学及气象学]