Mesopause temperatures and relative densities at midlatitudes observed by the Mengcheng meteor radar  

作　　者：Wen Yi XiangHui Xue MaoLin Lu Jie Zeng HaiLun Ye JianFei Wu Chong Wang TingDi Chen 

机构地区：[1]Chinese Academy of Sciences Key Laboratory of Geospace Environment,Department of Geophysics and Planetary Sciences,University of Science and Technology of China,Hefei 230026,China [2]Mengcheng National Geophysical Observatory,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [3]Hefei National Laboratory for the Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [4]Chinese Academy of Sciences Center for Excellence in Comparative Planetology,Hefei 230026,China [5]Collaborative Innovation Center of Astronautical Science and Technology,Harbin 150001,China

出　　处：《Earth and Planetary Physics》2023年第6期665-674,共10页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 42125402 and 42174183);the National Key Technologies R&D Program of China (Grant No. 2022YFF0503703);the B-type Strategic Priority Program of the Chinese Academy of Sciences (Grant No. XDB41000000);the foundation of the National Key Laboratory of Electromagnetic Environment;the Fundamental Research Funds for the Central Universities;the Chinese Meridian Project;funded by the Anhui Provincial Natural Science Foundation (Grant No. 2008085MD113);the Joint Open Fund of Mengcheng National Geophysical Observatory (No. MENGO-202209)

摘　　要：The atmospheric temperatures and densities in the mesosphere and lower thermosphere(MLT)region are essential for studying the dynamics and climate of the middle and upper atmosphere.In this study,we present more than 9 years of mesopause temperatures and relative densities estimated by using ambipolar diffusion coefficient measurements observed by the Mengcheng meteor radar(33.4°N,116.5°E).The intercomparison between the meteor radar and Thermosphere Ionosphere Mesosphere Energetics and Dynamics/Sounding of the Atmosphere by Broadband Emission Radiometry(TIMED/SABER)and Earth Observing System(EOS)Aura/Microwave Limb Sounder(MLS)observations indicates that the meteor radar temperatures and densities agree well with the simultaneous satellite measurements.Annual variations dominate the mesopause temperatures,with the maximum during winter and the minimum during summer.The mesopause relative densities also show annual variations,with strong maxima near the spring equinox and weak maxima before the winter solstice,and with a minimum during summer.In addition,the mesopause density exhibits a structure similar to that of the zonal wind:as the zonal wind flows eastward(westward),the mesopause density decreases(increases).At the same time,the meridional wind shows a structure similar to that of the mesopause temperature:as the meridional wind shows northward(southward)enhancements,the mesopause temperature increases(decreases).Simultaneous horizontal wind,temperature,and density observations provide multiple mesospheric parameters for investigating mesospheric dynamics and thermodynamic processes and have the potential to improve widely used empirical atmospheric models.

关 键 词：meteor radar MESOPAUSE horizontal wind temperature density 

分 类 号：P185.82[天文地球—天文学]