基于武汉MST雷达的对流层顶观测研究  

Research of the tropopause based on the observations from Wuhan MST radar

作　　者：青海银[1,2] 赵正予[2] 周晨[2] QING Hai-Yin;ZHAO Zheng-Yu;ZHOU Chen(School of Physics and Electronic Engineering,Leshan Normal University,Sichuan Leshan 614000,China;School of Electronic Information,Wuhan University,Wuhan 430072,China)

机构地区：[1]乐山师范学院、物理与电子工程学院,四川乐山614000 [2]武汉大学、电子信息学院空间物理系,武汉430072

出　　处：《地球物理学进展》2018年第4期1395-1402,共8页Progress in Geophysics

基　　金：国家自然科学基金(41574146,41804148); 四川省教育厅重点项目(18ZA0237); 乐山市科技局重点科技计划项目(17SZD203); 乐山师范学院科研项目(Z16023)共同资助

摘　　要：基于无线电探空仪和掩星的对流层顶观测虽然可以揭示对流层顶高度和温度的一些特性,但是在某一个地点的时间分辨率较低,资料的时间分辨率几乎都是以天计,同时所获得的对流层顶信息也不能直接反映对流层顶的产生、发展和消亡过程.借助于MST雷达具有高时间分辨率和连续性这一显著优势,实时、连续地获得对流层顶雷达回波,通过构建普适性雷达对流层顶判读模型,可以更好地研究对流层顶高度和结构形态的时空演化过程.探空仪对比实验表明:雷达方法观测对流层顶高度与气象学方法观测对流层顶高度相差约2 km,这应该和二者的探测机制相关.统计分析2012年全年雷达对流层顶回波差异值可以发现,雷达对流层顶高度的年平均值为13.3 km,标准差为0.65 km;对流层顶回波差异平均值约为11.7 d B,标准差为4.3 d B,雷达对流层顶回波差异值直接反映了雷达对流层顶结构的稀疏状态.同时本文利用Lomb-Scargle谱分析方法检测了对流层顶结构形态的扰动周期,结果表明大气潮汐波和行星波分量会影响对流层顶的结构形态.Although tropopause observed by the radiosonde and occultation can reveal some characteristics of tropopause height and temperature,the temporal resolution（ day） is lower at the same place and the obtained information can not directly reflect the process of generation,development and extinction of the tropopause. MST radar has the advantage of high temporal resolution and continuity,which can acquire radar echoes real-timely and continuously. By constructing a universal interpretation model of radar tropopause can be used to study the spatial and temporal evolution of tropopause height and structure. The contrast experiments about radiosonde and radar show that the difference of tropopause heights between radiosonde and radar is about 2 km,which should be related to the different detection mechanism. Statistical analysis about the difference of the radar tropopause echoes in 2012 shows that the mean height of tropopause is about 13. 3 km and the standard deviation is 0. 65 km; the mean difference of the echoes of the tropopause is about11. 7 d B and the standard deviation is 4. 3 d B. The difference of radar tropopause echo can reflect the sparse state directly. Meanwhile,the Lomb-Scargle spectrum analysis is used to detect the disturbance period of the tropopause structure. The results show that the atmospheric tidal waves and the planetary waves will affect the structure of the tropopause.

关 键 词：MST雷达 对流层顶 潮汐波 行星波 

分 类 号：P351[天文地球—空间物理学]