大气科学2025，Vol.49Issue(2)：460-476,17.DOI:10.3878/j.issn.1006-9895.2307.22249
雾顶辐射冷却驱动的湍流混合对华北平原雾的影响作用
Influence of Turbulent Diffusion Driven by Fog-Top Radiative Cooling on Heavy Fog in the North China Plain
摘要
Abstract
Radiative cooling at the top of a fog is a crucial physical process during fog evolution,driving a"top-down"turbulent mixing.The YSU(Yonsei University)scheme incorporates a module(ysu_topdown_pblmix)to represent this process.However,the influence of such"top-down"turbulent mixing on heavy fog events in the North China Plain remains unclear.Therefore,this study evaluates the suitability of ysu_topdown_pblmix in simulating fog events in the North China Plain using data from Himawari-8 satellite retrievals,automatic station observations,15-layer atmospheric boundary layer gradient measurements,and 5-layer turbulence-related observations.Large-eddy simulations are also employed to supplement the analysis.The investigation reveals that,while ysu_topdown_pblmix overall decreases the fog area simulation scores in the North China Plain,it significantly improves the simulation of the near-surface temperature,humidity,and fog boundary layer structure.This enhancement is attributed to the"top-down"turbulent mixing driven by radiative cooling at the fog top.However,the current version of ysu_topdown_pblmix exhibits an excessive entrainment effect,resulting in the intrusion of excessive warm air above the fog top and causing the rapid dissipation of fog.Sensitivity tests demonstrate that reducing the evaporative enhancement coefficient in ysu_topdown_pblmix can mitigate the strength of turbulent entrainment at the fog top,thereby improving the simulation of fog events.These findings suggest that incorporating ysu_topdown_pblmix is essential for accurately simulating heavy fog in the North China Plain,however,further refinement of relevant parameters is required.关键词
雾模拟/雾顶湍流/ysu_topdown_pblmix模块/大气边界层参数化/华北平原Key words
Fog simulation/Fog-top turbulence/Module ysu_topdown_pblmix/Boundary layer parameterization/North China Plain分类
天文与地球科学引用本文复制引用
田梦,吴彬贵,廖云琛,杨健博,郭阳,刘海玲,鞠婷婷..雾顶辐射冷却驱动的湍流混合对华北平原雾的影响作用[J].大气科学,2025,49(2):460-476,17.基金项目
国家自然科学基金项目42205009、42205092、42105084,天津市自然科学基金项目22JCQNJC00370,环渤海区域科技协同创新基金项目QYXM202112、QYXM202202,天津市气象局科研项目202226dgxm05、202306ybxm02、202309ybxm04 Funded by National Natural Science Foundation of China(Grants 42205009,42205092,42105084),Natural Science Foundation of Tianjin(Grant 22JCQNJC00370),Science and Technology Collaborative Innovation Fund of Bohai Rim Region(Grants QYXM202112,QYXM202202),Scientific Research Projects of Tianjin Meteorological Bureau(Grants 202226dgxm05,202306ybxm02,202309ybxm04) （Grants 42205009,42205092,42105084）
