Three-dimensional structure of the ABL and distribution of PM2.5 concentrations during a typical haze pollution process in winter 2019. (a) PM2.5 concentrations; (b) temperature; (c) wind speed .Credit: Li Q H et al.
A recent experiment from Peking University has provided new insights into the atmospheric boundary layer (ABL) during haze pollution. By unraveling the spatial structure heterogeneity of the ABL, researchers were able to analyze its effects on pollutant distribution as well as the role of mountain-induced vertical circulation in forming elevated pollution layers.
In the study, published in Science China Earth Sciences, researchers unveiled the results of a four-year study conducted in the North China Plain titled “Comprehensive Observation on the Atmospheric boundary layer Three-dimensional Structure” or COATS. For the experiment researchers utilized a “point-line-surface” layout, allowing them to obtain spatial-temporal profiles of environmental elements of the atmospheric boundary layer, as well as fine particulate matter transport data.
By obtaining three-dimensional structural images of the ABL, researchers were able to demonstrate that the heterogeneous distribution of haze pollution in the North China Plain was a result of the structure of the ABL. The Traihang mountains in the region also led to mountain-induced vertical circulations which created elevated pollution layers in the area of the study.
The researchers believe that the study could serve as a basis for the formation of regional pollution prevention and control measures. Further research into the effects of boundary layer profiles and the associated turbulent transport mechanisms of pollutants could be used to create more robust air quality forecasting methodologies.