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Analysis of the correlation between horizontal wind and 11-year solar activity over Langfang, China

Earth and Planetary Physics 2021年第3期5卷 270-279页

作者： Bing Cai QingChen Xu Xiong Hu Xuan Cheng JunFeng Yang Wen Li Key Laboratory of Science and Technology on Environmental Space Situation Awareness National Space Science CenterChinese Academy of SciencesBeijing 100190China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China

In this study,long term observations of medium frequency(MF)radar at Langfang site(39.4°N,116.7°E)from 2009 to 2020 have been used to analyze the dependence of the 11-year solar cycle on horizontal winds in the local mesosphere and lower thermosphere(MLT).The results show that the zonal wind is positively correlated with solar activity during spring at 80–84 km,and during summer at 80–82 km;the meridional wind is positively correlated with solar activity during spring at 84–88 km and during summer at 84–90 *** contrast,the results show no correlation between the horizontal wind and solar activity in autumn and *** attempt to explain the correlations in terms of the changes in stratospheric temperature and the net flux of gravity waves during solar *** addition,annual and semiannual oscillations of the zonal/meridional wind were found by using the least squares fitting method on daily horizontal winds,which show negative correlations with solar activity at heights of 80–90 km.

关键词： MF radar MLT horizontal wind solar cycle

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QUALITY CONTROL OF SINGLE DOPPLER RADAR DATA AND RETRIEVAL OF horizontal wind FOR A LANDING TYPHOON

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Journal of Tropical Meteorology 2008年第2期14卷 165-167页

作者：刘淑媛闫丽凤孙健 Air Force Meteorological Center Yantai Weather Bureau Chinese Academy of Meteorological Sciences/State key Laboratory of Severe Weather

The removal of noise and velocity ambiguity and retrieval and verification of horizontal wind field is a prerequisite to make the best and fullest use of Doppler radar measurements. This approach was applied to the Doppler radar data collected during August 2005 for a landing typhoon Matsa (0509) in Yantai, Shangdong Province, and the verified result shows that the quality control for this dataset was successful. The horizontal wind field was retrieved and then verified by studying the characteristics of the radar radial velocity and large-scale wind field and the vertical cross section of the radial velocity determined with the typhoon center as the circle center and comparing it with satellite imagery. The results show that the meso- and small-scale systems in Matsa and its horizontal and vertical structure could be clearly retrieved using the dataset collected by single Doppler radar, and a shear or a convergence was corresponding with a band of severe storm around Matsa. At the same time, the retrieved wind field from single Doppler radar is proved to be a reliable and high-resolution dataset in analyzing the inner meso-scale structure of Matsa. It is also proved that the method for removing the velocity ambiguity could be an effective approach for preliminary quality control of the Doppler radar data, and the VAP method could also be a reasonable solution for the analysis of mesoscale wind field.

关键词： Doppler radar horizontal wind retrieval velocity ambiguity landing typhoon

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

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Earth and Planetary Physics 2023年第6期7卷 665-674页

作者： Wen Yi XiangHui Xue MaoLin Lu Jie Zeng HaiLun Ye JianFei Wu Chong Wang TingDi Chen Chinese Academy of Sciences Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for the Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China

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 *** 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 *** variations dominate the mesopause temperatures,with the maximum during winter and the minimum during *** 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 *** 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

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