EAGER: Identifying the Limitations of the Contemporary Planetary Boundary Layer Schemes Using an Extended Self-Similarity-based Framework

大气边界层(ABL)横跨地球大气层最低的几百米，与下垫面密集交换质量(例如，水分)、动量和热量。这一湍流层中的风场在广泛的工业(如烟道气扩散、风能发电)、生物(如蒸散、花粉运输、鸟类和昆虫迁徙)和自然(如土壤侵蚀、运输和沉积)活动和过程中发挥着重要作用。中尺度模式需要结合稳健的行星边界层(PBL)方案才能可靠地捕捉到边界层的动态演变。目前，文献中还没有对PBL方案进行验证的严格基准。在这个急切的项目中，该项目将研究一种基于扩展自相似(ESS)框架的新的基于尺度的基准测试方法。这项研究源于经典的湍流文献，预计将是准通用的。智力上的好处：这个迫切的项目的显著特点是：(I)使用一套PBL方案创建一个无与伦比的模拟风数据库；以及(Ii)利用ESS框架确定各种PBL方案的优点和缺点。这项研究不仅将提高当代中尺度模式更好地捕捉风场动力学的能力，还将为经典湍流领域做出基础性贡献。广泛影响：通过这一迫切的项目，博士后研究助理将获得中尺度模式方面的专业知识，并接触到新兴的尺度规律和自相似过程领域。该项目的调查结果将通过同行评议的出版物、会议介绍和研讨会向广大受众传播。

The atmospheric boundary layer (ABL) spans the lowest few hundred meters of the earth's atmosphere and intensively exchanges mass (e.g., moisture), momentum, and heat with the underlying surface. Wind fields in this turbulent layer play major roles in a wide range of industrial (e.g., stack gas dispersion, wind energy generation), biological (e.g., evapotranspiration, pollen transport, migrations of birds and insects), and natural (e.g., soil erosion, transport, and deposition) activities and processes. Mesoscale models in conjunction with robust planetary boundary layer (PBL) schemes are needed to reliably capture the dynamical evolution of the ABL. At present, rigorous benchmarks for the validation of PBL schemes do not exist in the literature. In this EAGER project, the project will research a novel scaling-based benchmarking approach based on the extended self-similarity (ESS) framework. The study has roots in the classical turbulence literature and it is expected to be quasi-universal in nature.Intellectual Merit:The salient features of this EAGER project are: (i) creation of an unparalleled simulated wind database using a suite of PBL schemes; and (ii) identification of the strengths and weaknesses of various PBL schemes utilizing the ESS framework. This research will not only improve the ability of contemporary mesoscale models to better capture the dynamics of wind fields, it will also make fundamental contributions to the field of classical turbulence.Broader Impacts:Through this EAGER project, a post-doctoral research associate will gain expertise in mesoscale modeling, and be exposed to the emerging field of scaling laws and self-similar processes. The findings from this project will be disseminated to the broad audience via peer reviewed publications, conference presentations and seminars.