Collaborative Research: Lidar and Modeling Applications from the Precision Atmospheric Marine Boundary Layer Experiment (PreAMBLE) Dataset

合作研究：精密大气海洋边界层实验 (PreAMBLE) 数据集的激光雷达和建模应用

• 批准号: 1439515
• 负责人: David Rahn
• 金额: $ 14.57万
• 依托单位: University of Kansas Center for Research Inc
• 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: 2015-02-15 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1439515&HistoricalAwards=false
• 关键词: Collaborative; Research; Lidar; Modeling; Applications

The Precision Atmospheric Marine Boundary Layer Experiment (PreAMBLE) was a field study conducted from 17 May to 17 June 2012 based out of Point Mugu, CA. The central focus was to evaluate atmospheric dynamics associated with the atmospheric marine boundary layer near Point Conception and the California Bight. Airborne measurements were used to evaluate three major topics of research: the coastal jet near Point Conception, the Catalina eddy, and the initiation of coastally trapped wind reversals. PreAMBLE was highly successful and all major goals specified in the original proposal have been completed and published. Three unanticipated outcomes from PreAMBLE have prompted additional research. These include the sheer volume of unique and high quality data obtained, the unanticipated utility of the data collected by the cloud lidar, and the disappointing performance of operational and case-specific numerical simulations. Of the 15 research flights, only five have been required to address key issues from the original proposal. The current project for the remaining ten cases combined with the previous analyses will enable 1) a more comprehensive evaluation of the marine boundary layer characteristics within the Santa Barbara Channel such as height, temperature, and the horizontal pressure field, 2) examine the role of topography in forcing changes in marine boundary layer structure and cloud characteristics near Point Buchon, 3) analysis of marine layer structure, aerosol origin, and fine-scale structure based on the upward- and downward-pointing cloud lidars, and 4) critically evaluate the performance and capability of the Weather Research and Forecasting model in simulating the dynamics, thermodynamics, and cloud cover within the Santa Barbara Channel and near-coastal Pacific Ocean just west of Point Arguello.Intellectual Merit: Airborne measurements of the lower atmosphere offshore of southern California are rare since they are difficult to obtain, which makes the PreAMBLE dataset extremely valuable. Important characteristics of the complicated system near Point Conception and the Santa Barbara Channel have been revealed through case studies. Current conceptual models of the dynamics must make assumptions and neglect more complicated issues. These observations allow a critical examination of many of the assumptions. A synthesis of all of the flights during PreAMBLE will provide the community with information on the variability of the fine-scale features and quantify deviations between all cases. Contributions will be made in identifying the relative roles of forcing such as offshore flow and interaction with a complex boundary layer under different conditions. Not only will conceptual models of the dynamics be refined, but a critical examination of the numerical models will be conducted.Broader Impacts: The near-coastal environment near Point Conception and the Santa Barbara Channel continue to be of strategic importance. Meteorological phenomena in the marine boundary layer have prompted several major research efforts during the past two decades. Data collected as part of the PreAMBLE field study are among the few airborne measurements taken within this region and are essential for validation of previous conceptual models and provide a hard test for numerical simulations. This project will offer an opportunity for graduate student training in the observational aspects of atmospheric science, a focus that was identified as a key element for the June 2009 Advanced Study Program Colloquium. As with previous field experiments, graduate students from the University of Kansas and the University of Wyoming will become exposed to aircraft datasets and novel applications. The University of Wyoming King Air is a national facility that is available to the entire meteorological community. Advances in aircraft observation techniques including applications of lidar will promote further use by other scientists.

精密大气海洋边界层实验（PreAMBLE）是一项于2012年5月17日至6月17日在加利福尼亚州穆古角进行的实地研究。中心重点是评估与Point Conception和加州湾附近的大气海洋边界层相关的大气动力学。空中测量被用来评估三个主要的研究课题：海岸射流附近的概念点，卡塔利纳涡，并开始沿海被困风逆转。序言非常成功，原提案中规定的所有主要目标都已完成并公布。序言的三个意外结果促使了更多的研究。其中包括获得的独特和高质量数据的绝对数量，云激光雷达收集的数据的意外效用，以及操作和特定情况下的数值模拟的令人失望的性能。在15次研究飞行中，只有5次需要解决最初提案中的关键问题。目前对其余10个案例的项目与以前的分析相结合，将能够：1）对圣巴巴拉海峡内的海洋边界层特性（如高度、温度和水平压力场）进行更全面的评估，2）检查地形在迫使布琼点附近海洋边界层结构和云特性发生变化方面的作用，3）分析海洋层结构，气溶胶起源和基于向上和向下指向的云激光雷达的精细尺度结构; 4）严格评估天气研究和预报模型在模拟圣巴巴拉海峡和靠近海岸的太平洋内的动力学、热力学和云量方面的性能和能力。对南加州近海低层大气的空中测量是罕见的，因为它们很难获得，这使得PreAMBLE数据集非常有价值。 通过实例分析，揭示了Point Conception和圣巴巴拉海峡附近复杂系统的重要特征。目前的动态概念模型必须做出假设，忽略更复杂的问题。这些观察允许对许多假设进行批判性检查。PreAMBLE期间所有飞行的综合将为社区提供关于精细尺度特征的可变性的信息，并量化所有情况之间的偏差。将作出贡献，在确定强迫的相对作用，如离岸流和在不同条件下与复杂的边界层的相互作用。不仅将改进动力学的概念模型，而且将对数值模型进行严格审查。更广泛的影响：概念点和圣巴巴拉海峡附近的近海岸环境仍然具有战略重要性。 在过去二十年中，海洋边界层的气象现象促进了几项重大的研究工作。作为PreAMBLE现场研究的一部分收集的数据是在该区域内进行的为数不多的空中测量之一，对于验证以前的概念模型至关重要，并为数值模拟提供了一个硬测试。该项目将为研究生提供培训大气科学观测方面的机会，这一重点被确定为2009年6月高级研究计划学术讨论会的一个关键要素。 与以前的实地实验一样，来自堪萨斯大学和怀俄明州大学的研究生将接触飞机数据集和新的应用。怀俄明州空中国王大学是一个全国性的设施，可供整个气象界。飞机观测技术的进步，包括激光雷达的应用，将促进其他科学家的进一步使用。