摘要
钠激光雷达凭借其卓越的时间和空间分辨率,能够精准探测中层顶区域的动力学及化学变化信息,成为研究重力波扰动和中高层大气变化的重要工具.本研究基于“子午工程”在海南海口站(19.99°N,110.34°E)2010—2013年收集的夜间钠激光雷达数据,深入分析了低纬度海南地区中高层大气稳定性参数的季节分布规律.结果显示,在一年的大部分时间里,理查森数主要分布在0.75~2之间,平均值约为1.49.相较于春秋季,海南夏季和冬季的大气扰动更为强烈.通过分析水平风扰动的季节分布规律以及单天内钠层的时空演化,本文探讨了扰动事件中的不稳定过程.同时,研究发现秋季存在一些特殊的扰动事件,这些事件的水平扰动较大,导致海南秋季的大气扰动依然显著.而冬季仍然活跃的重力波活动可能是导致海南11—12月中高层大气不稳定过程的主要原因.电离层数据分析表明大气不稳定度与附近地基台站观测到的电离层突发E层的相关性较弱,而重力波等由地球地形和运动形成的波扰动对钠层的形态和稳定的影响更为显著.这些发现有助于我们更深入地理解低纬度中高层大气的动力学规律和全球中低纬大气的环流过程.
Sodium lidar,with its excellent temporal and spatial resolution,can accurately detect dynamic and chemical change information in the mesopause region,which is commonly considered to be an important tool for studying gravity wave(GW)disturbances and changes in the middle and upper atmosphere.In this study,based on Meridian Project nighttime sodium lidar data collected from 2010 to 2013 at the Haikou station(19.99°N,110.34°E),a deep analysis of the seasonal distribution of stability parameters in the middle and upper atmosphere at Hainan low latitudes was reported.The result shows that Richardson numbers are mainly distributed between 0.75 and 2 for most of the year,with an average value of approximately 1.49.Compared to spring and autumn,atmospheric disturbances are more intense in summer and winter in Hainan.And by analyzing the seasonal distribution of horizontal wind disturbances and evolution of the sodium layer within single day,the unstable processes during disturbance events was explored in this paper.Additionally,it was found that some special events in autumn,lead the notable atmospheric disturbances during this season.The still active GW activities in winter may be the main reason for the unstable processes in the middle and upper atmosphere from November to December.Analysis of ionospheric data indicated correlation between atmospheric instability and the sporadic E-layer observed by nearby ground-based stations are weak,while GWs and other disturbances formed by Earth′s terrain and activities have a more significant impact on the shape and stability of the sodium layer.These above results can help us better understand the dynamic mechanisms of the middle and upper atmosphere at low latitudes and the global mid-to-low latitude atmospheric circulation processes.
作者
刘思胤
邹旭
羊大立
张铁民
曲轶
杨红
张焓笑
彭鸿雁
杨国韬
杜丽芳
LIU SiYin;ZOU Xu;YANG DaLi;ZHANG TieMin;QU Yi;YANG Hong;ZHANG HanXiao;PENG HongYan;YANG GuoTao;DU LiFang(Department of Physics and Electronic Engineering,Hainan Normal University,Haikou Hainan 571158,China;State Key Laboratory of Solar Activity and Space Weather,National Space Science Center,Chinese Academy of Sciences,Beiing 100190,China)
出处
《地球物理学报》
北大核心
2026年第1期35-45,共11页
Chinese Journal of Geophysics
基金
国家自然科学基金(42564009,62063005,41564006,41174129)
海南省自然科学基金(121RC535,20164163)资助。
关键词
中高层大气
钠激光雷达
海南
理查森数
大气稳定性
Middle and upper atomsphere
Sodium lidar
Hainan
Richardson number
Atmospheric stability
