Numerical Simulation and Parameterization of Gravity Wave Propagation and Effects in the Lower, Middle and Upper Atmosphere

两名研究人员正在进行互补的数值模拟，以了解重力波的传播和频谱演变，以及在大规模大气模型中对这些影响的参数化。一种是利用波浪叠加和相互作用的完全非线性三维研究，评估频谱随高度的演变、平均和低频波切变对波各向异性和动量通量的影响，以及伴随波叠加的耗散。另一种是在热层高度的低频波和平均切变中的波的传播和行为，其中三维效应在确定波幅和平均流相互作用中并不重要。这两种方法都在很大程度上修订和更新了几个中低大气和热层模型中使用的重力波效应的现有参数。具体地说，这些修订：(1)更准确地描述了波的叠加、相互作用和不稳定的影响；(2)复制了对波的活动性、可变性和影响的观测；以及(3)扩展到了比以前使用参数化方案可能的更高的高度。

Two investigators are conducting complementary numerical modeling to gain understanding of gravity wave propagation and spectral evolution and the parameterization of these effects in large-scale models of the atmosphere. One employs fully nonlinear three dimensional studies of wave superposition and interactions to assess spectral evolution with altitude, influences on wave anisotropy and momentum fluxes from mean and low-frequency wave shears, and the dissipation accompanying wave superposition. The other addresses wave propagation and behavior in low-frequency wave and mean shears at thermospheric altitudes where three dimensional effects are not important in determining wave amplitudes and mean flow interactions. Both approaches substantially revise and update existing parameterization of gravity wave effects employed in several models of the lower and middle atmosphere and thermosphere. Specifically, the revisions: (1) more accurately describe the effects of wave superposition, interactions and instability; (2) replicate observations of wave activity, variability and effects; and (3) extend to greater altitudes than previously possible with parameterization schemes.