First meteor radar observations of tidal oscillations over Jicamarca (11.95° S, 76.87° W)
First meteor radar observations of tidal oscillations over Jicamarca (11.95° S, 76.87° W)
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DOI：
10.5194/angeo-27-2575-2009
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发表时间：
2009-06
影响因子：
1.9
通讯作者：
L. Guo;G. Lehmacher
中科院分区：
文献类型：
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作者：
L. Guo;G. Lehmacher
摘要。利用新安装的Jicamarca全天高光流星雷达（JASMET）观测资料，研究了Jicamarca（11.95°S, 76.87°W）上空赤道中层和低层热层（MLT）区域的潮汐振荡。给出了80 ~ 100 km范围内日、半日潮的垂直结构和季节变化。分析结果表明，京马卡岛的日潮在纬向和经向分量上均表现出较强的日潮，且经向分量大于纬向分量。最大的日振幅，45米/秒的纬，55米/秒的子午线，观察到春分左右。纬向日幅值在90 ~ 96 km处达到最大值，经向日幅值在大部分月份随海拔高度增大。半日振幅的变化不如日振幅大。将潮汐分量的垂直结构与全球尺度波浪模式（GSWM02）预报和TIMED卫星上TIDI测量的潮汐风分析结果进行了比较。JASMET和TIDI的数据显示，日潮和半日潮的幅度相似。GSWM02高估了日振幅，但低估了纬向分量和经向分量的半日振幅。
Abstract. Tidal oscillations in the equatorial mesosphere and lower thermosphere (MLT) region over Jicamarca (11.95° S, 76.87° W) are studied using the observations from the newly installed Jicamarca All-sky Specular MEteor Radar (JASMET). The vertical structure and seasonal variability of diurnal and semidiurnal tides from 80–100 km are presented. The analyses show a strong diurnal tide over Jicamarca for both zonal and meridional components with the meridional amplitudes being larger than the zonal ones. Maximal diurnal amplitudes, 45 m/s for zonal and 55 m/s for meridional, are observed around equinox. The zonal diurnal amplitudes reach maxima at 90–96 km, while the meridional diurnal amplitudes grow with altitude for most months. Semidiurnal amplitudes vary not as strong as diurnal amplitudes. The vertical structures of the tidal components are compared with Global Scale Wave Model (GSWM02) prediction and the tidal wind analysis results from TIDI measurements onboard of the TIMED satellite. The data from JASMET and TIDI show similar amplitudes for both diurnal and semidiurnal tides. GSWM02 overestimates diurnal amplitudes, but underestimates semidiurnal amplitudes for both zonal and meridional components.