Continued Lidar and Numerical Investigation of the Internal Boundary Layer Observed During Lake-Ice

驱动大气环流的大部分能量是通过与地表交换热量、水分和动量获得的。 为了研究五大湖上空的这些过程，1997/1998年冬季在密歇根湖上空进行了一个被称为湖诱导对流实验（湖冰）的项目。 威斯康星州的体积成像激光雷达的大学获得了一个独特的数据集在湖冰领域的项目。 这些数据将被用来验证一个微尺度模型的大气边界层在湖冰期间开始的研究的延续性能。 威斯康星州大学的非流体静力学建模系统将用于模型模拟。 模型结果将直接比较VIL观察到的边界层的结构特征，使用验证技术开发的先前NSF support.This工作是一个努力，模拟大尺度流和微尺度流结构的演变，迫使当地地形和土地利用的功能。 公共、私营和军事部门对这种预报产品很感兴趣。 目前很少有人知道的有效性模型模拟的具体微尺度结构。 此外，对这种规模的流动动力学的理解主要局限于研究稳定流的统计特性，而不是直接模拟特定的演变结构，这可能与特定的地形特征有关，如山丘，建筑物和湖岸几何形状。 这是一个独特的努力，以验证模型模拟的微尺度功能非常高的分辨率observations.Project的目标是（1）评估的能力，一个微尺度模型模拟预测的大尺度流演变的本地响应和（2）增加的强迫和动力学的理解，导致观察到的相干结构。 首席研究员将集中研究两个观测到的现象：（a）湖冰卷的成因和（B）12月21日观测到的海岸锋，如果成功，这项研究将增进对大气边界层系统的了解，并发展有助于研究这种系统的分析方法。 这可能会导致更好地了解和预测污染物通过复杂地形的迁移和扩散等现象。

Much of the energy that drives atmospheric circulations is obtained through exchanges of heat, moisture, and momentum with the surface. To study these processes over the Great Lakes, a project known as the Lake-Induced Convection Experiment (Lake-ICE) was held over Lake Michigan in the winter of 1997/98. The University of Wisconsin Volume Imaging Lidar acquired a unique data set during the Lake-ICE field project. These data will be used to validate the performance of a microscale model of the atmospheric boundary layer in a continuation of the research begun during Lake-ICE. The University of Wisconsin Nonhydrostatic Modeling System will be used for the model simulations. Model results will be compared directly to the structural features of the boundary layer observed by the VIL using verification techniques developed under prior NSF support.This work is an effort to simulate both the evolution of the large-scale flow and the microscale flow structures, forced by local topographical and land use features. There is a great deal of interest by the public, private and military sectors in such forecast products. Currently little is known about the validity of model simulations of specific microscale structures. Moreover, understanding of the flow dynamics on this scale has been limited to mostly studies that focus on statistical properties of steady flow, rather than the direct simulation of specific evolving structures, which may be tied to specific topographic features such as hills, buildings, and lakeshore geometry. This is a unique effort to validate model simulations of microscale features against very high-resolution observations.Project goals are to (1) assess the ability of a microscale model to simulate the local response to predicted large scale flow evolution and (2) increase understanding of the forcings and dynamics leading to the observed coherent structures. The Principal Investigator will concentrate on two observed phenomena: (a) the genesis of Lake-ICE rolls and (b) the coastal front observed on 21 December.If successful, this research will advance knowledge of atmospheric boundary layer systems and develop analysis methodologies useful in studying such systems. This potentially could lead to better understanding and forecasting of such phenomena as the transport and diffusion of pollutants through complex terrain.