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

IF 2.9 3区 地球科学
Wen Yi, XiangHui Xue, MaoLin Lu, Jie Zeng, HaiLun Ye, JianFei Wu, Chong Wang, TingDi Chen
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Abstract

The atmospheric temperatures and densities in the mesosphere and lower thermosphere (MLT) region are essential for studying the dynamics and climate in the middle and upper atmosphere. In this study, 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) are presented. The intercomparison between the meteor radar and Thermosphere Ionosphere Mesosphere Energetics and Dynamics/Sounding of the Atmosphere by Broadband Emission Radiometry (TIMED/SABER) and EOS Aura/Microwave Limb Sounder (MLS) observations indicates that the meteor radar temperatures and densities agree well with the simultaneous satellite measurements. The annual variations dominate mesopause temperatures, with a maximum during winter and a minimum during summer. The mesopause relative densities also show annual variations with strong maxima near the spring equinox and weak maxima before the winter solstices 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 flow is 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.
孟城流星雷达观测的中纬度地区中层顶温度和相对密度
中层和低层热层区域的大气温度和密度是研究中高层大气动力学和气候的基础。本文利用孟城流星雷达(33.4°N, 116.5°E)观测的双极扩散系数估算了9年多来的中流层温度和相对密度。流星雷达与热层电离层中间层能量动力学/大气宽带发射辐射探测(TIMED/SABER)和EOS Aura/微波边缘测深(MLS)观测结果的对比表明,流星雷达的温度和密度与卫星同步测量结果吻合较好。年中顶温度的年际变化占主导地位,冬季最高,夏季最低。中层顶相对密度在春分前后最大,冬至前后最大,夏季最小。此外,中气层顶的密度与纬向风的密度结构相似;当纬向风向东(向西)流动时,中层顶密度减小(增大)。同时,经向风表现出与中顶温度相似的结构;当经向风向北(向南)增强时,中层温度升高(降低)。同时进行的水平风、温度和密度观测为研究中间层动力学和热力学过程提供了多个中间层参数,并有可能改进广泛使用的经验大气模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Earth and Planetary Physics
Earth and Planetary Physics GEOSCIENCES, MULTIDISCIPLINARY-
自引率
17.20%
发文量
174
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