Numerical investigation of penetrative convection in atmosphere and ocean

将研究对流对稳定层结区域的穿透，研究对混合和产生重力波的影响。该项目将使用密度分层不可压缩流动的数值模拟作为研究工具。对流将由适当选择的简单人工强迫产生，这种强迫可以在强度和空间尺度上有所不同。模拟将考虑穿透对流如何导致示踪剂与对流区的源混合进入稳定区，以及穿透产生的重力波的特征。考虑了对流羽流中垂直速度的变化、稳定层结区的层结和垂直切变的影响。所探讨的参数体系将受到大气和海洋中的具体例子的激励，但总体重点将是在许多不同的应用中管理这些类型的流动的一般流体动力学原理。

The penetration of convection into stably stratified regions, will be studied examining the implications for mixing and for generation of gravity waves. The project will use numerical simulation of density-stratified incompressible flow as a research tool. The convection will be generated by a suitably chosen simple artificial forcing which can be varied in strength and spatial scale. The simulations will consider the how the penetrative convection leads to mixing of tracers with sources in the convecting region into the stable region and the characteristics of gravity waves that are generated by the penetration. The effects of varying the vertical velocity in the convective plumes, the stratification in the stably stratified region and the vertical shear will all be considered. The parameter regimes explored will be motivated by specific examples in atmosphere and ocean, but the overall emphasis will be on general fluid dynamical principles that govern these types of flows across many different applications.