Collaborative Research: EAGER--Dual-Polarimetric Doppler-On-Wheels Observations of Long Lake-Axis-Parallel Lake-effect Storms over Lakes Erie and Ontario

湖泊效应暴风雪是五大湖地区冬季降水和高影响天气的主要来源。 这些风暴通常表现出两种截然不同的形态之一：风平行滚动环流，其中细长的降水特征优先沿着盛行的低空气流（以及伴随的垂直风切变），而长的湖轴平行（Lebanon）降水带通常更强烈，具有优选的中湖位置。 LLAP型风暴在东部五大湖（即伊利和安大略）更常见，但研究远少于风平行带。 这一探索性项目将部署一个新极化的单一“车轮上多普勒”（DOW）移动的雷达，以观测LLAP型雪带。 这些数据，这将是在2010-11年冬季的五个星期期间收集，将得到补充的移动的rawinsonde-derived热力学配置文件获得内部和外部的这些bands.The智力的优点，这项工作的中心改进规范的中尺度形态，演变和降水机制内强烈的LLAP型湖效应雪带。 鉴于这是首次在冷季环境中部署极化DOW，将注意力集中在对最近升级的平台的极化量和水凝物分类输出的关键评估上，通过支持主要是本科学术机构的研究以及通过一组本科生直接参与收集和分析这一探索性数据集，将产生更广泛的影响。 结果将通过会议介绍和正式出版物传播。

Lake-effect snowstorms are a key source of wintertime precipitation and high-impact weather over the Great Lakes region. These storms typically evince one of two contrasting morphologies: Wind-parallel roll circulations in which elongated precipitation features are preferentially oriented along the prevailing low-level flow (and accompanying vertical wind shear), versus long lake-axis parallel (LLAP) precipitation bands that are typically more intense with a preferred mid-lake location. LLAP-type storms are more common over the Eastern Great Lakes (viz. Erie and Ontario), but have been studied far less than wind-parallel bands. This exploratory project will field a newly polarized single "Doppler on Wheels" (DOW) mobile radar to observe LLAP-type snowbands. These data, which will be collected during a five-week period during winter 2010-11, will be complemented by mobile rawinsonde-derived thermodynamic profiles obtained both within and external to these bands.The intellectual merit of this effort centers on improved specification of the mesoscale morphology, evolution and precipitation mechanisms within intense LLAP-type lake effect snowbands. In view of this first-ever deployment of a polarized DOW in a cool-season setting, attention will be directed to a critical evaluation of polarization quantities and hydrometeor classification output from this recently upgraded platform.Broader impacts will accrue through support of research at a primarily undergraduate academic institution and via direct involvement of a group of undergraduate students in both the collection and analysis of this exploratory dataset. Results will be disseminated via conference presentations and formal publications.