Mixed Layer Turbulence and Entrainment

0117411D‘Asaro/UWTHIS是一个旨在分析两次拉格朗日浮标在地面混合层中部署的数据的项目。一个部署由三个花车组成，另一个由两个花车组成。预计更多的数据将来自2002年由ONR资助的一项试验。其目的是观察混合层中的湍流动能、混合层湍流的结构、风应力和表面波活动之间的关系。还将研究卷吸速率对风和表面波的依赖关系。所使用的方法包括检查混合层中不同水平(接近地面、内部和接近混合层底部)的w、Du/Dz的谱和密度扰动，其中预计将有不同的动力学占优势(表面波、均匀湍流、内波)。该项目还包括一项检查垂直热量和盐预算的尝试。作为本项目的一部分，将进行混合层的数值模拟、大涡模拟。这些模拟将与从浮标获得的数据进行比较，目的是测试表面波效应和层化对混合层湍流的影响的新参数。

0117411D'Asaro/UWThis is a project intended to analyze data from two deployments of Lagrangian floats in the surface mixed layer. One deployment consisted of three floats and the other, two. It is anticipated that additional data will come from an ONR-funded experiment in 2002. The intention is to look at the relation between turbulent kinetic energy in the mixed layer, the structure of mixed layer turbulence, wind stress, and surface wave activity. The dependence of entrainment rate on wind and surface waves will also be studied. The approach used involves examining spectra of w, du/dz, and density perturbations at different levels in the mixed layer (near the surface, in the interior, and near the base of the mixed layer) where different dynamics are expected to prevail (surface waves, homogeneous turbulence, internal waves). The project also includes an attempt to examine vertical heat and salt budgets. As part of this project, numerical simulations of the mixed layer, Large-Eddy Simulations will be made. These simulations will be compared to data derived from the floats with the aim of testing new parameterizations of the effects of surface waves and of the influence of stratification on mixed-layer turbulence.