GREYBLS: modelling GREY-zone Boundary LayerS

GREYBLS：模拟灰色区域边界层

• 批准号: NE/K011502/1
• 负责人: Robert Plant
• 金额: $ 31.52万
• 依托单位: University of Reading
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FK011502%2F1
• 关键词: GREYBLS; modelling; GREY; zone; Boundary

Society benefits significantly from the numerical weather forecasts provided by the Met Office. Recently, PA consulting valued the Met Office's public weather service in excess of £600 million pa. The high-resolution (small grid box) numerical weather forecasts of the Met Office provide information on, for example: surface temperature, low-level cloud and fog, and the onset of thunderstorms. This benefits the public and a wide range of industries including: agriculture, aviation, construction, wind energy, retail and transport. This project aims to deliver improvements to the high-resolution numerical weather prediction (NWP) models used to make these forecasts.The atmospheric boundary layer is the region adjacent to the surface in which there are significant turbulent fluxes of heat, moisture and momentum. The boundary layer has a significant diurnal cycle over land forced by solar heating. It is also strongly coupled to other important processes in the atmosphere such as large-scale weather systems and convective storms. The boundary layer diurnal cycle thus plays a key role in many high-impact aspects of weather such as: surface temperature, the dispersion of pollutants and chemical species, low level cloud and fog, and the onset of thunderstorms. The diurnal cycle of the boundary layer is also important in regional climate and climate change, for example, extreme temperatures over land with increased greenhouse gas emissions. Nevertheless, there are important limitations in our understanding and ability to forecast the diurnal cycle of the boundary layer at high resolution.The aim of this project is to develop new techniques for modelling the boundary layer at high resolution in a regime called the "grey zone". The grey zone describes the situation where the grid box of a NWP model is of comparable size to the boundary layer depth. With increasing supercomputer power, the grid boxes of NWP models are now below 5 km, so the grey zone is becoming a pressing issue. However, there is currently little understanding about how to model it. New modelling techniques will likely be required such as applying stochastic forcing. This project aims to improve our understanding by performing a systematic comparison of the possible methods for modelling the grey zone. From this understanding, we will then design a new parametrization (representation) of the boundary layer for the grey zone for use in the Met Office NWP model. Improved modelling of the grey zone will then lead to improved high resolution forecasts at the Met Office.

社会从气象局提供的数值天气预报中受益匪浅。最近，PA咨询公司对英国气象局的公共气象服务的估值超过6亿英镑。英国气象局的高分辨率（小网格框）数值天气预报提供的信息，例如：表面温度，低空云和雾，雷暴的开始。这使公众和广泛的行业受益，包括：农业，航空，建筑，风能，零售和运输。该项目旨在改进用于进行这些预报的高分辨率数值天气预报模式。大气边界层是邻近地面的区域，其中有大量的热量、水分和动量湍流通量。边界层有一个显着的日周期在陆地上的太阳加热强迫。它还与大气中的其他重要过程密切相关，如大规模天气系统和对流风暴。因此，边界层日循环在天气的许多高影响方面起着关键作用，例如：表面温度，污染物和化学物质的扩散，低空云和雾，以及雷暴的发生。边界层的昼夜循环在区域气候和气候变化中也很重要，例如，陆地上的极端温度和温室气体排放量增加。尽管如此，我们对高分辨率边界层日循环的理解和预测能力仍有很大的局限性，本项目的目的是开发新技术，以高分辨率模拟被称为"灰色地带"的区域的边界层。灰色区域描述了数值预报模式的网格框与边界层深度相当的情况。随着超级计算机能力的提高，NWP模型的网格框现在低于5公里，因此灰色区域正在成为一个紧迫的问题。然而，目前对如何模拟它的了解很少，可能需要新的模拟技术，如应用随机强迫。该项目旨在通过对灰色区域建模的可能方法进行系统比较来提高我们的理解。从这一理解，我们将设计一个新的参数化（表示）的边界层的灰色区域中使用的气象局数值预报模式。改进灰色地带的建模将导致气象局提高高分辨率预报。

项目成果

Simulating the convective boundary layer with a dynamic Smagorinsky model

使用动态 Smagorinsky 模型模拟对流边界层

• 发表时间: 2016
• 作者: M.-M. Bopape

Greyzone Workshop Working Group 3 Report

灰色地带研讨会第 3 工作组报告

• 发表时间: 2017
• 作者: A. Stirling

The Atmospheric Boundary Layer and the "Gray Zone" of Turbulence: A Critical Review

• DOI: 10.1029/2019jd030317
• 发表时间: 2020-07-16
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
• 影响因子: 4.4
• 作者: Honnert, Rachel;Efstathiou, Georgios A.;Zhou, Bowen
• 通讯作者: Zhou, Bowen

Resolution Dependence of Turbulent Structures in Convective Boundary Layer Simulations

对流边界层模拟中湍流结构的分辨率依赖性

• DOI: 10.3390/atmos11090986
• 发表时间: 2020
• 期刊: Atmosphere
• 影响因子: 2.9
• 作者: Bopape M

Effects of stability functions in a dynamic model convective boundary layer simulation

动态模型对流边界层模拟中稳定函数的影响

• DOI: 10.1002/asl.1008
• 发表时间: 2020
• 期刊: Atmospheric Science Letters
• 影响因子: 3
• 作者: Bopape M