Characterization of the Daytime Convective Boundary Layer Using Numerical Simulations and Radar Field Experiments

使用数值模拟和雷达现场实验表征白天对流边界层

• 批准号: 0553345
• 负责人: Phillip Chilson
• 金额: $ 40.19万
• 依托单位: University of Oklahoma Norman Campus
• 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: 2006-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0553345&HistoricalAwards=false
• 关键词: Characterization; Daytime; Convective; Boundary; Layer

This project will combine a unique combination of boundary layer radar (BLR) and large eddy numerical simulation (LES) approaches to the study of the planetary boundary layer. These two approaches will be synthesized through the development and implementation of an advanced radar simulator. This simulator can be used to develop new radar configurations and capabilities, and to better interpret BLR observations.Method: An LES code will be used to generate data representative of a clear convective boundary layer (CBL) under various meteorological conditions. Output parameters of the LES include three-dimensional fields of velocity, subfilter turbulence kinetic energy, potential temperature, and specific humidity. The LES will form an integral component of the radar simulator to be developed. A virtual BLR will be programmed that will be capable of probing the LES-generated atmospheric fields using a variety of radar configurations, including multiple beams and frequencies. Convective boundary layer data, including atmospheric properties determined from in situ instrumentation as well as radar observations, from several field experiments, will also be collected. Actual and virtual radar observations will be compared for the same boundary layer situations. These experiments will be conducted at the central facility of the Department of Energy Atmospheric Radiation Measurement Program Southern Great Plains site located southeast of Lamont, Oklahoma. Intellectual Merit: The consolidation of LES and radar approaches will provide a unique opportunity to investigate the effectiveness and applicability of both LES and various other means of characterizing the CBL, especially those designed to work with BLR observations. Once developed, the radar simulator can be used to address research objectives beyond those outlined in the study, such as development of more sophisticated radar observing techniques, and interpretation of BLR observations in more complex boundary layer situations. The virtual BLR will become a tool that can be used by the radar and boundary layer community at large involved in studies around the world for a wide range of applications. Broader Impacts: Cross-fertilization between the LES and radar communities will be encouraged by making the results readily available to the research community via the Internet and by widely presenting findings of the study at professional meetings and through journal publications. The investigators are taking the lead in developing a new cross-disciplinary curriculum at the University of Oklahoma on weather radar and instrumentation. Results from this study will be incorporated into the curriculum, which provides an in-depth education in radar and instrumentation with emphasis on a hands-on experience. This aspect of the program directly addresses a major concern among leaders in the meteorological community concerning the lack of expertise in the use of instrumentation. Finally, to help address the needs to incorporate more underrepresented groups into meteorology and engineering, the investigators on this project have been actively interacting with programs on campus that offer assistance in recruiting women and minorities.

该项目将结合边界层雷达（BLR）和大涡数值模拟（LES）方法的独特组合来研究行星边界层。这两种方法将通过开发和实现一个先进的雷达模拟器来综合。该模拟器可用于开发新的雷达配置和功能，并更好地解释BLR观测结果。方法：利用LES代码生成各种气象条件下的对流边界层资料。LES的输出参数包括三维速度场、亚滤波湍流动能、位温和比湿度。LES将成为待开发雷达模拟器的一个组成部分。将对虚拟BLR进行编程，使其能够使用多种雷达配置（包括多种波束和频率）探测les产生的大气场。还将收集对流边界层数据，包括从现场仪器和雷达观测中确定的大气特性，以及从几个实地实验中获得的数据。将对相同边界层情况下的实际和虚拟雷达观测结果进行比较。这些实验将在位于俄克拉何马州拉蒙特东南部的能源部大气辐射测量计划南部大平原的中心设施进行。智力优势：LES和雷达方法的整合将提供一个独特的机会来研究LES和其他各种表征CBL的方法的有效性和适用性，特别是那些设计用于BLR观测的方法。一旦开发完成，雷达模拟器可用于解决研究中概述的研究目标之外的问题，例如开发更复杂的雷达观测技术，以及在更复杂的边界层情况下解释BLR观测结果。虚拟BLR将成为雷达和边界层界在世界范围内广泛应用的研究工具。更广泛的影响：将鼓励LES和雷达社区之间的交叉施肥，使研究结果通过互联网随时提供给研究界，并通过专业会议和期刊出版物广泛展示研究结果。在俄克拉荷马大学，研究人员带头开发了一门关于气象雷达和仪器的新的跨学科课程。这项研究的结果将纳入课程，提供雷达和仪器的深入教育，重点是实践经验。该计划的这一方面直接解决了气象界领导人关于缺乏仪器使用专业知识的主要问题。最后，为了帮助解决将更多未被充分代表的群体纳入气象学和工程学的需求，该项目的研究人员一直在积极与校园内的项目互动，为招募女性和少数民族提供帮助。