2012年7月海口与北京大气钠层观测  

Observations of Sodium Layer over Beijing and Haikou in July 2012

作　　者：张铁民[1] 王继红[2] 王林茂[1] 陈学明[1] 吴建清[1] 邹旭[1] 彭鸿雁[1] 

机构地区：[1]海南师范大学物理与电子工程学院,海口571158 [2]中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190

出　　处：《空间科学学报》2017年第4期424-431,共8页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(41364005;41564006);海南省自然科学基金项目(20164163)共同资助

摘　　要：2012年7月海南激光雷达站(20°N,110°E)和北京激光雷达站(40°N,116°E)同时进行观测,对比低纬和中纬度中高层大气钠层分布及密度变化特性.两地使用相同的Nd:YAG激光器和泵浦染料激光器产生589 nm激光,设定相同的激光参数,使用相同的直径1000 mm的望远镜接收钠层的光子回波.两地均观测到突发钠层和双钠层事件.其中:海口观测到突发钠层事件9个,双钠层事件1个;北京观测到突发钠层事件1个,双钠层事件4个.分析海口和北京同一天夜间观测的大气钠层特性,对比两地同时观测到的钠层高度与密度的不同变化,发现当天夜间低纬度地区海口市上空钠层出现双钠层结构,持续时间123 min,但是北京上空钠层没有发现该结构.The observations were conducted by lidar over Haikou （20°N, ll0°E） and Beijing （40°N, 116°E） in July 2012. The basic characteristics of the sodium layer density at a low-latitude and mid- latitude location are analyzed by the observations. The double sodium layer events and sporadic layer were observed over Beijing and Haikou. A Nd：YAG laser and a pumped dye laser are used to generate the probing beam. The wavelength of the dye laser is set to be 589 nm by a sodium fluorescence cell. The energy and divergence of the beam are set about 45 mJ and lmrad, respectively. The backscattered fluorescence photons from the sodium layer are collected by a telescope with a primarymirror which diameter is equal to 1000 mm. There are 9 events of Sporadic Sodium Layer （SSL） and 1 event of Double Sodium Layer （DSL） occurred in Haikou, and 1 event of SSL and 4 events of DSL occurred in Beijing. The variety and distribution of the sodium density over Beijing and Haikou during the night of July 1, 2012 are compared. A DSL structure was observed and it had lasted 120min during the night of July 1, 2012 over Haikou, but no DSL structure occurred over Beijing.

关 键 词：激光雷达 中高层大气 钠层密度 大气光学 

分 类 号：P412.2[天文地球—大气科学及气象学]