Numerical Simulation and Parameterization of Gravity Waves 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光谱演变，并在大尺度大气模型中对这些影响进行参数化。一种方法是利用波叠加和相互作用的完全非线性三维研究来评估频谱随海拔的演变，平均和低频波剪切对波各向异性和动量通量的影响，以及伴随波叠加的耗散。另一种是讨论在热层高度的低频波和平均切变中的波传播和行为，其中三维效应在确定波幅值和平均流相互作用方面并不重要。这两种方法都大大修正和更新了现有的几种中低层大气和热层模式所采用的重力波效应参数化。具体而言，修订：(1)更准确地描述了波叠加、相互作用和不稳定性的影响；(2)重复波浪活动、变化和效应的观测；(3)与以前的参数化方案相比，可以扩展到更高的高度。

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.