MJO与中间层-低热层风场潮汐DE3季节内变化性的关联  

MJO modulation on the intraseasonal variability of MLT DE3 tide in winds

作　　者：周旭[1] 乐新安[1,2,3] 陈桂万 余优 胡连欢[1,3] ZHOU Xu;YUE XinAn;CHEN GuiWan;YU You;HU LianHuan(Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Science,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing National Observatory of Space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]中国科学院地质与地球物理研究所中国科学院地球与行星物理重点实验室,北京100029 [2]中国科学院大学地球与行星科学学院,北京100049 [3]中国科学院地质与地球物理研究所,北京空间环境国家野外科学观测研究站,北京100029 [4]中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029

出　　处：《地球物理学报》2023年第12期4817-4827,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金青年科学基金项目(42204165);面上项目(41974180)资助。

摘　　要：本文结合TIMED-TIDI卫星与流星雷达子午链风场观测数据,分析了中间层-低热层(MLT)区域非迁移潮汐DE3的季节内变化性及其与对流层MJO的可能关联.结果揭示了DE3风场潮汐广泛存在显著的宽频带季节内变化信号,且强度存在季节依赖.纬向风DE3潮汐(DE3-U)季节内变化在北半球冬季具有较强幅值,可达季节平均的1~2倍,而在其他季节通常在20%以内.结合MJO指数进一步讨论了不同季节下DE3-U对MJO的响应.统计结果表明,在影响较大的北半球冬季,DE3-U通常在MJO第4—6位相时有更大的幅值(+10%~+40%),而在其余位相时更小(-10%~-40%).这表明对流层与MJO相关的对流活动通过潜热释放的纬向变化可影响高空大气非迁移潮汐的强度.This paper analyzed the intraseasonal variability of non-migrating tides DE3 in the mesosphere and lower thermosphere(MLT)region and the possible connection with the tropospheric MJO using the joint observations of the TIMED-TIDI satellite and the 120°E meridian meteor radar chain.The results revealed a significant broad-band intra-seasonal signal in the DE3 amplitude with a clear seasonal dependence.The intraseasonal variability of DE3 in zonal winds(DE3-U)has a strong amplitude in boreal winter,up to 1~2 times the seasonal average,while the variability is usually within 20%during other seasons.The response of MLT DE3 tides to the MJO in different seasons was further discussed together with the MJO activity index.The results suggested that the DE3-U in boreal winter generally has a larger amplitude during MJO phases 4-6(about 10%~40%),while the amplitude is smaller for other MJO phases(about-10%~-40%).This implies that the zonal variations of latent heat released in the troposphere,which is related to the MJO phase,are likely to affect the intensity of non-migrating tides in the upper atmosphere.

关 键 词：大气潮汐 季节内变化性 Madden-Julian Oscillation(MJO) TIMED-TIDI 流星雷达 

分 类 号：P351[天文地球—空间物理学]