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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Gravity Wave Variation from the Troposphere to the Lower Thermosphere during a Stratospheric Sudden Warming Event: A Case Study
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Gravity Wave Variation from the Troposphere to the Lower Thermosphere during a Stratospheric Sudden Warming Event: A Case Study

机译：平流层突然变暖事件中从对流层到低热层的重力波变化：案例研究

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摘要

High resolution Whole Atmosphere Community Climate Model (WACCM) simulations are used to study how gravity waves vary during a stratospheric sudden warming (SSW) event from the source region to the lower thermosphere. The variation of zonal mean momentum flux of resolved gravity waves (with zonal wavelengths less than 1600 km) during SSW are qualitatively consistent with those obtained from parameterized studies, mainly caused by the change of filtering by the mean zonal wind. At high latitude in the winter hemisphere, stratospheric and mesospheric momentum fluxes vary rapidly during SSW, and their magnitudes decrease significantly following SSW, agreeing with satellite observations. Gravity waves are also found to vary as wave sources change. At tropical regions (especially in the summer hemisphere), convectively generated gravity waves increase due to enhanced deep convection following SSW. At higher latitudes, orographic waves vary during SSW as the wind changes extend from the stratosphere down into the troposphere. Gravity waves generated from adjustment of the polar jet also undergo significant changes during SSW. These changes lead to strong longitudinal variation of gravity waves.
机译：高分辨率整体大气社区气候模型（WACCM）模拟用于研究在平流层突然变暖（SSW）事件中，从源区到较低热圈的重力波如何变化。在SSW期间，分辨重力波（纬向波长小于1600 km）的纬向平均动量通量的变化与参数化研究获得的定性一致，这主要是由于纬向平均风的过滤变化引起的。在冬季半球的高纬度地区，平流层和中层动量通量在南半球期间迅速变化，并且随着南半球的变化，其动量通量显着下降，这与卫星观测一致。还发现重力波会随着波源的变化而变化。在热带地区（特别是在夏季半球），对流产生的重力波由于南极南太平洋运动后深对流的增强而增加。在较高的纬度上，随着风的变化从平流层向下延伸到对流层，地形波在SSW期间会发生变化。在SSW期间，通过调整极角射流产生的重力波也会发生重大变化。这些变化导致重力波在纵向上发生强烈变化。

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