摘要
利用中国科学院国家空间科学中心廊坊站(40.0°N,116.3°E)钠荧光多普勒激光雷达2011年至2013年共约82 h的钠原子数密度和垂直风观测数据,分析了廊坊地区中间层顶区域大气重力波耗散引起的钠原子输送特征.分析得到,90~100km处重力波耗散引起的平均钠原子垂直通量整体为负,钠原子向下输送,在93 km处达到最大负值-1.47×10~8m^(-3)m·s^(-1),85~90km处平均钠原子垂直通量为正,钠原子向上输送,但通量值随高度递减.钠原子垂直通量方向在90km处发生转变,垂直通量随高度的变化造成钠原子汇聚,汇聚效应引起的平均钠原子产生率最大值在91km处达到了1.40×10~8m^(-3)/h,该值超过了相同高度上模式计算流星烧蚀注入引起的钠原子产生率峰值,说明重力波耗散对钠层结构的形成具有重要影响.与美国SOR和Maui观测结果相比,平均钠原子产生率峰值大小相近,但出现高度不同,说明大气重力波耗散引起的物质输送具有显著的地域变化特征.研究结果可为大气物质输送理论的完善以及大气金属层物理模式的改进提供观测事实参考.
A total of 82 h observation data derived from a sodium fluorescence Doppler lidar of National Space Science Center （Chinese Academy of Sciences） at Langfang station （40.0° N, 116.3° E）, China, were used to study Na atoms transportations induced by gravity wave dissipation in the mesopause region. The mean vertical Na flux was upward from 85 to 89 km, while the flux became downward from 90 to 100 km; the maximum flux was -1.47×10^8 m^-3 m·s^-1 at 93 km. The mean Na production rate was positive from 85 to 93.5 km, while the rate became negative from 94 to 98 km; the maximum rate was 1.4×10^8 m^-3/h at 91 km. These results suggest the activities of gravity wave dissipations accumulate Na atoms at near 91 km and make the mean Na production rate significantly increase between 88 and 92 km. The mean production rate induced by gravity wave dissipation exceeds the model simulated production rate induced by meteoric input at near 91 km, the observation and comparison results indicate gravity wave dissipations play an important role in the formation of Na layer structure in the mesopause region. Compare with the observation result of SOR and Maui, Na flux and Na production rate are respectively comparable between three stations, but the altitude of maximum value of Na flux and Na production are different, the geographical factors are considered to make contribution to the diversities of Na layer and gravity wave activities in different locations. These observation results can provide guidance for parameterization and evolution of atmospheric metal model in the mesopause region.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第2期499-506,共8页
Chinese Journal of Geophysics
基金
国家重点研发计划"天地联合多时空尺度近地空间环境监测"课题(2016YFB0501503)
国家自然科学基金(41104100)
高分专项青年创新基金(GFZX04060103)共同资助
