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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Average statistical characteristics of long gravity waves observed with the middle and upper atmosphere radar in the mesosphere
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Average statistical characteristics of long gravity waves observed with the middle and upper atmosphere radar in the mesosphere

机译：在中层大气和中层大气雷达中观测到的长引力波的平均统计特征

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摘要

Average statistical characteristics of internal gravity waves (IGWs) with horizontal wavelengths longer than 60 km are obtained at the altitudes 65-80 km from the observations with the middle and upper atmosphere radar at Shigaraki, Japan (35 degrees N, 136 degrees E) in 1986-1995. The numbers of signals selected with narrow frequency band fillers attributed to IGW having periods 0.1-6 hours vary between 870 and 2300 for different seasons and altitudes. Long-period IGWs have larger amplitudes and larger vertical wavelengths than short-period IGWs. For waves with periods 0.1-6 hours the mean values of the horizontal and vertical wavelengths are 100 - 300 km and 6 - 10 km, respectively. IGW amplitudes and momentum fluxes have maxima in winter and summer and minima in spring and autumn. Distributions of the azimuths of IGW horizontal wave vectors and momentum fluxes are nearly isotropic with maxima in zonal directions in summer. The westward momentum flux is larger than the eastward Aux in winter and is smaller than that in summer. The differences between eastward and westward wave momentum fluxes are larger for long-period IGWs. The net zonal IGW momentum flux is mainly directed opposite to the mean wind in the mesosphere. [References: 57]
机译：从日本Shigaraki（北纬35度，东经136度）中高空大气雷达的观测值得出，在65-80 km的高度上可获得水平波长超过60 km的内部重力波（IGW）的平均统计特征。 1986年至1995年。对于不同的季节和高度，使用归因于IGW的具有0.1-6小时周期的窄频带填充器选择的信号数量在870和2300之间变化。长周期IGW比短周期IGW具有更大的幅度和更大的垂直波长。对于周期为0.1-6小时的波浪，水平和垂直波长的平均值分别为100-300 km和6-10 km。 IGW的振幅和动量通量在冬季和夏季达到最大值，在春季和秋季达到最小值。在夏季，IGW水平波矢量和动量通量的方位角分布几乎各向同性，在纬向方向上具有最大值。在冬季，向西的动量通量大于向东的辅助通量，而在夏季，则小于向西的动量通量。对于长周期IGW，东西向动量通量之差较大。净纬向IGW动量通量主要指向与中层平均风相反的方向。 [参考：57]

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