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Upper-tropospheric Vortex Street and its Formation Mechanism

机译：对流层上涡街及其形成机制

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References(10) Supplementary materials(1) Upper-tropospheric vortices having a horizontal wavelength of 300-400 km were observed on water vapor images of the Japanese geostationary satellite (MTSAT-1). Grid point values predicted by the Regional Spectral Model of the Japan Meteorological Agency show that the vortices were located along a zonal belt with strong cyclonic shear and horizontal convergence. A quasi-geostrophic linear stability analysis of the basic flow having horizontal and vertical shear shows that the fastest growing mode has a horizontal wavelength, a phase speed and a growth rate that reasonably agree with those of the satellite observation. The amplitude of the fastest growing mode is confined to a region having a meridional width of 2 degrees and a vertical depth of 2 km. An energy budget analysis shows that barotropic instability is the dominant generation mechanism for the growing mode.
机译：参考文献（10）补充材料（1）在日本对地静止卫星（MTSAT-1）的水蒸气图像上观测到了水平波长为300-400 km的对流层上层涡旋。日本气象厅的区域光谱模型预测的网格点值表明，涡流位于带强气旋剪切和水平收敛的地带上。对具有水平和垂直剪切的基本流的准地转线性稳定性分析表明，最快的增长模式的水平波长，相速度和增长率与卫星观测的合理吻合。最快的增长模式的幅度被限制在子午线宽度为2度，垂直深度为2 km的区域中。能量预算分析表明，正压不稳定是增长模式的主要生成机制。

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