Parametrization of momentum and energy depositions from gravity waves generated by tropospheric hydrodynamic sources
Parametrization of momentum and energy depositions from gravity waves generated by tropospheric hydrodynamic sources
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DOI：
10.1007/s00585-997-1570-4
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发表时间：
1997-12-01
期刊：
影响因子：
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通讯作者：
Gavrilov, NM
中科院分区：
文献类型：
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作者：
Gavrilov, NM
考虑了对流层中尺度湍流产生内部重力波（IGW）的机制。推导了描述动量、热量和质量的流体动力源产生波浪的方程。计算了对流层中产生的 IGW 引起的振幅、波能通量、湍流粘度和平均流加速度。对 IGW 在大气中产生湍流的不同机制的比较表明：初级 IGW 非线性破坏为次级波频谱可能会提供非饱和稳定波的额外耗散。平均风增加了沿风向传播的IGW的发电和消散效率。两种效应的竞争可能导致在距对流层波源较远的上游传播的IGW占据主导地位，并在中层顶附近形成夏季向东的波加速和冬季向西的加速。
The mechanism of generation of internal gravity waves (IGW) by mesoscale turbulence in the troposphere is considered. The equations that describe the generation of waves by hydrodynamic sources of momentum, heat and mass are derived. Calculations of amplitudes, wave energy fluxes, turbulent viscosities, and accelerations of the mean flow caused by IGWs generated in the troposphere are made. A comparison of different mechanisms of turbulence production in the atmosphere by IGWs shows that: the nonlinear destruction of a primary IGW into a spectrum of secondary waves may provide additional dissipation of nonsaturated stable waves. The mean wind increases both the effectiveness of generation and dissipation of IGWs propagating in the direction of the wind. Competition of both effects may lead to the dominance of IGWs propagating upstream at long distances from tropospheric wave sources, and to the formation of eastward wave accelerations in summer and westward accelerations in winter near the mesopause.