Balanced mesoscale motion and stratified turbulence forced by convection
Balanced mesoscale motion and stratified turbulence forced by convection
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DOI：
10.1002/qj.49712354209
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发表时间：
1997-07
影响因子：
8.9
通讯作者：
GK Vallis;GJ Shutts;Meb Gray
中科院分区：
文献类型：
--
作者：
GK Vallis;GJ Shutts;Meb Gray
利用一个大涡模拟模式对深对流在大气中尺度产生的层结湍流和重力波能量进行了数值试验。相对较长的积分（通常约2.5天）进行，使统计平衡可能会达到一个固定的冷却和地面保持在恒定的温度下的大气。主要的模拟可以被认为是代表了经过温暖海洋的冷气流中的对流活动。在平衡运动和分层湍流理论的背景下，研究了上升气流动能转化为准水平旋转能及其随后的更大尺度的叶栅。进行实验以检查科里奥利力、波阻尼平流层、边界层垂直风切变和降水的影响。
Numerical experiments are carried out with a large‐eddy simulation model to investigate the production of stratified turbulence and gravity wave energy in the atmospheric mesoscale by deep convection. Relatively long integrations (typically about 2.5 days) are carried out, so that statistical equilibrium might be achieved for an atmosphere subject to fixed cooling and a ground surface maintained at constant temperature. The main simulations may be considered as representing convective activity in a cold airstream passing over warm seas. The transfer of updraught kinetic energy into quasi‐horizontal rotational energy, and its subsequent cascade to larger scales, is examined in the context of the production of balanced motion and stratified turbulence theory. Experiments are carried out to examine the effects of the Coriolis force, a wave‐damping stratosphere, boundary‐layer vertical wind shear, and precipitation.