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

南极高原强分层大气边界层过程的理解、参数化和建模

• 批准号: 0538453
• 负责人: Sukanta Basu
• 金额: --
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538453&HistoricalAwards=false
• 关键词: Understanding; Parameterizing; Modeling; Strongly; Stratified

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.

拟议的工作是一个气象调查的结构的绝热边界层的目标是改善现有的，或制定新的稳定的中尺度大气模型的边界层参数化，使用创新的方法相结合，如大涡模拟，现场测量的统计分析，和下一代建模技术。 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分层大气边界层方面的能力;系统地验证LES结果与现有的南极实地观测结果，并提出了改进的和基于物理的通量参数化的中尺度模式的基础上LES生成的数据库结合实地观测。涡流模拟是一种建模技术，它已成为模拟各种应用中湍流详细结构的重要工具，包括低层大气和上层海洋中的边界层。 大涡模拟用于详细研究边界层如何传递热量、动量和微量化学成分，以及如何在天气预报和气候模式中表示这些过程。本质上，它是一个高分辨率的模型嵌入在一个较低分辨率的模型，数值求解三维流体流动的Navier-Stokes方程，使它可以代表重要的湍流运动，或涡流的流动。拟议中的工作将为稳定分层流的研究做出根本性的贡献，而稳定分层流的研究远远超出了对南极气象学的直接应用。