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

大气边界层（ABL）横跨地球大气层的最低几百米，并与下垫层表面密集交换质量（如水分）、动量和热量。这个湍流层中的风场在广泛的工业（例如，烟囱气体扩散，风能产生），生物（例如，蒸散发，花粉运输，鸟类和昆虫的迁徙）和自然（例如，土壤侵蚀，运输和沉积）活动和过程中发挥重要作用。中尺度模式需要结合鲁棒行星边界层（PBL）方案来可靠地捕捉ABL的动力演变。目前，文献中还没有严格的PBL方案验证基准。在这个EAGER项目中，该项目将研究一种基于扩展自相似（ESS）框架的新型基于缩放的基准测试方法。该研究植根于经典湍流文献，并有望在本质上具有准普遍性。知识价值：这个EAGER项目的突出特点是：(i)使用一套PBL方案创建了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方案的优缺点。该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，而且将对经典湍流领域做出根本性的贡献。更广泛的影响：通过这个EAGER项目，博士后研究助理将获得中尺度建模的专业知识，并接触到标度定律和自相似过程的新兴领域。该项目的调查结果将通过同行评议出版物、会议发言和研讨会向广大听众传播。

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.