Multi-Scale Interactions in the Lake Induced Boundary Layer

9629343推动大气循环的大部分能量是通过与地表的热量、水分和动量交换而获得的。湖泊效应事件是研究这些交换的极好的自然实验室，在五大湖上空冷气团被迅速修改。湖泊诱导对流实验(Lake-ICE)是一个多主体研究项目，旨在利用这个自然实验室来确定边界层增长过程如何受中尺度边界层对流结构的控制，以及修改后的边界层如何影响降水的产生和更大尺度的气象条件。主要研究人员将使用各种现场和远程测量来攻击以下目标：确定中尺度环流对边界层顶部夹带过程的调制程度；确定卷吸是通过与边界层中的大涡环流有关的吞没发生的，还是通过小尺度界面混合发生的，并确定过程对大尺度和中尺度条件的敏感性。确定卷吸事件对云顶液滴大小分布的影响。这些目标将通过以下方式实现：编制卷吸事件空间范围的统计数据库；通过分析雷达得出的垂直层剖面确定云顶卷吸过程；根据大、中、云尺度条件对统计数据库进行分类；卷吸事件微物理影响的个案研究。这项研究的最终成果将是中尺度带的合成二维反射率和垂直速度结构，以及相应的云尺度和交叉反转湍流强度，以及几个详细的案例研究说明。这些将为这些不同运动尺度之间的相互作用提供更好的量化物理理解。***

9629343 Verlinde Much of the energy that drives atmospheric circulations is obtained through exchanges of heat, moisture, and momentum with the surface. Lake-effect events, where cold air masses are rapidly modified over the Great Lakes, are excellent natural laboratories for studying these exchanges. The Lake- Induced Convection Experiment (Lake-ICE) is a multiple- Principal Investigator project which seeks to use this natural laboratory to determine how boundary layer growth processes are controlled by mesoscale boundary layer convective structures and how the modified boundary layer effects the production of precipitation and the larger scale meteorological conditions The Principal Investigator will use a variety of in situ and remote measurements to attack the following objectives: Determine the extent to which mesoscale circulations modulate the entrainment processes at the top of the boundary layer; Determine if entrainment occurs through engulfment associated with large-eddy circulations n the boundary layer or through small-scale interfacial mixing and determine sensitivity of the processes to large and mesoscale conditions. Determine the impact of entrainment events on the drop size distribution at cloud top. These objectives will be accomplished by: Compiling a statistical data base of the spatial extent of entrainment events; The identification of cloud-top entrainment processes through analysis of radar derived vertical layer profiles; Categorizing the statistical data base according to large-, meso- and cloud-scale conditions; Case studies of the microphysical impact of entrainment events. The final products of the study will be a composite two-dimensional reflectivity and vertical velocity structure of a mesoscale band, with corresponding cloud-scale and cross-inversion turbulence intensity, and several descriptions of detailed case studies. These will provide a better quantitativ e physical understanding of the interaction between these different scales of motion. ***