Understanding, Parameterizing and Modeling the Strongly Stratified Atmospheric Boundary Layer Processes over the Antarctic Plateau

拟议的工作是对南极边界层结构的气象调查，目的是利用大涡模拟、现场测量统计分析和下一代建模技术等创新方法的组合，改善现有的或制定新的稳定的中尺度大气模式的边界层参数化。具体目标是研究和改进现有的大涡模拟(LES)亚网格尺度模拟技术在模拟强层结大气边界层方面的能力；系统地验证大涡模拟的结果与现有的南极野外观测结果，并结合野外观测提出改进的基于大涡模拟数据库的中尺度模式的通量参数。大涡模拟是一种模拟技术，已成为模拟各种应用中的湍流详细结构的重要工具，包括低层大气和上层海洋的边界层。LES用于详细研究边界层如何输送热量、动量和痕量化学成分，以及如何在天气预报和气候模式中表示这些过程。它本质上是一个嵌入低分辨率模型的高分辨率模型，用于数值求解三维流体流动的Navier-Stokes方程，从而能够表示流动中重要的湍流运动或涡流。拟议的工作将对稳定分层流动的研究作出根本性贡献，这远远超出了直接应用于南极气象学的范围。

The proposed work is a meteorological investigation of the structure of the antarctic boundary layer with the goal of improving existing, or formulating new stable boundary layer parameterizations for mesoscale atmospheric models, using a combination of innovative approaches, such as large-eddy simulations, statistical analyses of field measurements, and next-generation modeling techniques. The specific objectives are to investigate and improve the capabilities of existing large-eddy simulation (LES) subgrid-scale modeling techniques in simulating strongly stratified atmospheric boundary layers; systematically validate the LES results against available antarctic field observations, and propose improved and physically based flux parameterizations for mesoscale models based on LES-generated databases in conjunction with field observations.Large-eddy simulation is a modeling technique that has become an important tool for simulating the detailed structure of turbulent flows in various applications, including the boundary layers in the lower atmosphere and the upper ocean. LES is used to study in detail how boundary layers transfer heat, momentum and trace chemical constituents, and how to represent these processes in weather prediction and climate models. Essentially it is a high resolution model embedded within a lower resolution model that solves numerically the Navier-Stokes equations for three-dimensional fluid flow, so that it can represent the important turbulent motions, or eddies in the flow. The proposed work would make fundamental contributions to the study of stably stratified flows, which extend well beyond the immediate application to antarctic meteorology.