摘要
介绍了中国科学技术大学的米-瑞利-钠荧光双波长激光雷达系统,其双波长发射和三通道探测技术使得该激光雷达系统能够对近地面到110 km高度范围内的多种物理量——气溶胶、大气温度和密度、钠层密度进行探测.利用该激光雷达系统近一年的钠层密度观测数据,分析了合肥地区(31.87°N,117.23°E)钠层的主要形态、夜间变化、季节变化特点.结果显示,合肥钠层柱密度最小值为1.126×109cm-2,出现在6月份;最大值为6.014×109cm-2,出现在12月份;柱密度在夏季表现出相当宽广的极小值,质心高度没有明显的季节变化,而RMS宽度则呈准半年变化.
In Dec. 2005, a Mie-Rayleigh-Sodium fluorescence lidar system was construct at USTC, Hefei, China （31.87°N, 117. 23°E） for measurements at altitudes between ground level and 110 kin, i. e. , aerosol extinction （ground level to 30 km）, atmospheric （25°70 km） temperatures, and sodium （80°110 km） density. In the past one year after the lidar was set up, routine observations of sodium layer over Hefei were carried on. The characteristics of the shape, nocturnal variations and seasonal variations of sodium layer were obtained. The results show that sodium abundance reaches maximum value 6.014× 10^9 cm^-2in December, approximately 5 times larger than the June minimum value 1. 126 × 10^9 cm^-2. The abundance shows rather broader minimum values throughout the summer months, the centroid height has no evident seasonal variations, but the RMS width exhibits semi-annual variations.
基金
中国科学院知识创新工程重要方向性项目(kzcx2-yw-123)
武汉大学地球空间环境与大地测量教育部重点实验室空间物理基础研究基金(L06-3)
中国科学院大气物理研究所"联合创新青年学者计划"(IAP07307)资助
