Airborne Measurements of the Nocturnal Low-level Jet and Wave Disturbances in the Stable Boundary Layer in PECAN (Plains Elevated Convection At Night)

PECAN（平原夜间高对流）稳定边界层夜间低空急流和波浪扰动的机载测量

• 批准号: 1359645
• 负责人: Bart Geerts
• 金额: $ 75万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1359645&HistoricalAwards=false
• 关键词: Airborne; Measurements; Nocturnal; Low; level

This award is for participation in the Plains Elevated Convection at Night (PECAN) field campaign. PECAN will take place in the central United States in the summer of 2015. The focus of the project is on overnight thunderstorm complexes that regularly occur in the Great Plains area. A variety of observational systems will be put in place for the field experiment including multiple aircraft, mobile radars, and ground-based systems that can profile the wind and particles in the lower atmosphere. This individual award provides funding for researchers to take part in the campaign and make use of data from the University of Wyoming King Air (UWKA) research aircraft. The UWKA will sample the near-surface environment near thunderstorm complexes and areas of anticipated thunderstorm development in order to better understand the triggers and forcing mechanisms that help these complexes survive. This project will help to increase understanding of these convective systems in order to better predict and warn the public of hazardous weather. The project will also help to train the future generation of scientists by involving multiple graduate students in the research.The steering committee for the PECAN campaign has identified four main research topics to be addressed: 1) Nocturnal convection initiation and early evolution of mesoscale convective clusters; 2) Bore and other wave-like disturbances; 3) Dynamics and microphysics of nocturnal mesoscale convective systems; 4) Prediction of nocturnal convection initiation and evolution. This research under this award will help to address each of these topics. The project will document the structure, properties and evolution of bores and solitons in unprecedented detail, gain insight in the behavior of bores/solitons in the context of the observed ambient stability and shear profiles, and to examine their role in convective initiation. An associated project goal is to study the mesoscale kinematics and dynamics of the nocturnal low level jet over the Great Plains.

该奖项旨在奖励对平原夜间高对流 (PECAN) 实地活动的参与。 PECAN 将于 2015 年夏天在美国中部举行。该项目的重点是大平原地区经常出现的夜间雷暴复合体。 现场实验将部署各种观测系统，包括多架飞机、移动雷达和能够对低层大气中的风和颗粒进行分析的地面系统。 该个人奖项为研究人员参与该活动并利用怀俄明大学国王航空 (UWKA) 研究飞机的数据提供资金。 UWKA 将对雷暴复合体和预计雷暴发展区域附近的近地表环境进行采样，以便更好地了解帮助这些复合体生存的触发因素和强迫机制。 该项目将有助于增进对这些对流系统的了解，以便更好地预测和警告公众危险天气。 该项目还将通过让多名研究生参与研究来帮助培养未来一代的科学家。PECAN 活动指导委员会确定了四个需要解决的主要研究主题：1）夜间对流启动和中尺度对流星团的早期演化; 2) 钻孔和其他波状扰动； 3）夜间中尺度对流系统动力学与微观物理； 4）夜间对流产生和演化的预测。 该奖项下的这项研究将有助于解决这些主题。 该项目将以前所未有的细节记录孔和孤子的结构、性质和演化，在观察到的环境稳定性和剪切剖面的背景下深入了解孔/孤子的行为，并检查它们在对流引发中的作用。 一个相关的项目目标是研究大平原上空夜间低空急流的中尺度运动学和动力学。

项目成果

Convection initiation and bore formation following the collision of mesoscale boundaries over a developing stable boundary layer: a case study from PECAN

发展中的稳定边界层上的中尺度边界碰撞后的对流引发和孔形成：PECAN 的案例研究

• DOI: 10.1175/mwr-d-20-0282.1
• 发表时间: 2021-05
• 期刊: Monthly Weather Review
• 影响因子: 3.2
• 作者: Lin, Guo;Grasmick, Coltin;Geerts, Bart;Wang, Zhien;Deng, Min
• 通讯作者: Deng, Min