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Simulation of Internal Gravity Wave Propagation Due to Sudden Stratospheric Warming

机译:突然平流层升温引起的内部重力波传播的模拟

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摘要

The results of modeling the effect of stratospheric internal gravity waves (IGWs) excited in the region of sudden stratospheric warming (SSP) on the state of the upper atmosphere are presented. The numerical experiment used a two-dimensional model of atmospheric wave propagation including the dissipative and nonlinear processes accompanying the wave propagation. As a perturbation source, perturbations of temperature and density in a localized region at stratospheric altitudes during the SSW were considered. The amplitude and frequency of the perturbation source were evaluated from the results of observations and IGW theory. The results of numerical calculations showed that the heat source localized in the stratosphere excites IGWs with periods of up to several hours, which reach the thermospheric altitudes within a few hours. The maximum relative perturbations created by these waves relative to the unperturbed conditions were noted at altitudes of 100-200 km and at distances of up to 1000 km from the source center.
机译:介绍了在突然平流层升温(SSP)区域中激发的平流层内重波(IGWS)对上层大气状态的影响的结果。数值实验用来了大气波传播的二维模型,包括伴随波传播的耗散和非线性过程。作为一种在SSW期间,作为一种扰动源,在SSW期间,在STROSHIC海拔地区的局部区域中的温度和密度的扰动。从观察结果和IGW理论的结果评估了扰动源的幅度和频率。数值计算的结果表明,平流层中局部化的热源激发了多达几个小时的IGW,这在几小时内到达了热散射高度。这些波相对于未受干扰的条件产生的最大相对扰动在100-200公里的海拔地区注意到,距离源中心高达1000公里的距离。

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