南极中山站-冰穹A断面表层雪不溶微粒单颗粒形貌特征及矿物组成  

Individual Particle Characteristic and Mineral Composition of Insoluble Particles in Surface Snow along a Traverse Route from Zhongshan Station to Dome A,Antarctica

作　　者：张王滨 侯书贵[1] 庞洪喜[1] 周丽娅[1] 周鹏[2] 

机构地区：[1]南京大学地理与海洋科学学院,南京210023 [2]中国科学院海洋研究所,山东青岛266071

出　　处：《矿物岩石地球化学通报》2015年第6期1103-1108,1080,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：极地专项(CHINARE2015-02-02);国家自然科学基金项目(41276192;41171052;41176165)

摘　　要：采用扫描电子显微镜与X射线能谱仪联用系统(SEM-EDX)研究了南极中山站-冰穹A断面表层雪中不溶微粒的特征(如形态、化学组成和成因等)。结果显示,该断面表层雪不溶微粒中不规则形貌的单颗粒占绝对优势,其矿物组成以"富Si类"颗粒为主。不易风化的"富Si类"颗粒含量在高海拔地区较高,而在低海拔地区则较低。不溶微粒单颗粒矿物组成的这种分布特征主要与东南极不同海拔地区大气环流的差异有关。在东南极洲冰盖海拔2000m以上是大尺度经向环流作用地区,不溶微粒来源于远源输运。海拔2000m以下是中尺度高纬海洋和冰盖边缘强气旋作用地区,不溶微粒来源于南极洲边缘沿海地区。Scanning electron microscopy equipped with energy dispersive X-ray detector（ SEM-EDX） was used to study the individual particle characteristic and mineral composition of insoluble particles in surface snow along a traverse route from Zhongshan station to Dome A,Antarctica. Observation of SEM reveals that the insoluble particles are mainly composed of＂Si-rich＂particles with the irregular shape. The content of＂Si-rich＂particles in surface snow collected from high altitude（〉 2000 m） region is high,but that in surface snow collected from low altitude region（〈 2000 m） is relatively low. This may be associated with different atmospheric circulation between high altitude region and low altitude region. The high altitude region is affected by large-scale circulation with longitude-direction,and that insoluble particles in surface snow come from long sources. The low altitude region is mainly affected by strong cyclones at peripheral region of the ice sheet,and the sources of insoluble particles could be at the coastal area of Antarctica.

关 键 词：南极冰穹A 微粒 单颗粒 矿物组成 颗粒来源 

分 类 号：P426.635[天文地球—大气科学及气象学]