| Title | Quantitative verification of the turbulence barrier effect during heavy haze pollution events |
| Authors | Ren, Yan Zhang, Hongsheng Zhang, Xiaoye Wu, Bingui Cai, Xuhui Song, Yu Zhu, Tong |
| Affiliation | Lanzhou Univ, Collaborat Innovat Ctr Western Ecol Safety, Lanzhou 730000, Peoples R China Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Beijing 100081, Peoples R China China Meteorol Adm CMA, Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing 100081, Peoples R China China Meteorol Adm CMA, Chinese Acad Meteorol Sci, Key Lab Atmospher Chem CMA, Beijing 100081, Peoples R China Tianjin Municipal Meteorol Bur, Tianjin 300074, Peoples R China Peking Univ, Dept Environm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100081, Peoples R China |
| Keywords | STABLE BOUNDARY-LAYER INTERMITTENT TURBULENCE EXPLOSIVE GROWTH BLACK CARBON MASS FLUX AEROSOL SURFACE ATMOSPHERE EPISODES PM2.5 |
| Issue Date | 1-Apr-2022 |
| Publisher | ENVIRONMENTAL RESEARCH COMMUNICATIONS |
| Abstract | Under calm and steady weather conditions with low wind speeds, turbulent intermittency frequently occurs in the atmospheric boundary layer (ABL), which can significantly weaken the turbulent diffusion of matter and energy between the surface and atmosphere. The turbulence barrier effect is defined as the phenomenon in which turbulence may disappear at certain heights, and during periods of heavy haze, creating what can seem like a barrier layer that hinders vertical transmissions. Although the turbulence barrier effect can explain the physical mechanisms behind the rapid accumulation of PM2.5 (fine particulate matter with diameters smaller than 2.5 mu m) and the influence of turbulent diffusion conditions on the vertical distribution of PM2.5, more direct perspectives such as turbulent flux is still required for quantitative verification. Due of challenges in the acquisition of PM2.5 turbulent flux, carbon dioxide (CO2), which has relatively mature flux acquisition technology, was used as a substitute means of verifying and quantifying this phenomenon. The turbulence data collected during heavy haze events, at from five levels of a 255 m meteorological tower located in Tianjin, were analyzed and used to quantitatively verify the influence of the turbulent barrier effect on PM2.5. The results also revealed that the vertical changes in the turbulent barrier effect were consistent with those of the concentrations and flux of CO2. This means that this knowledge about the turbulent barrier effect can be extended to other mass-transfer processes. The analysis also found that the proportion of counter-gradient transport increases when the occurrences of the turbulent barrier effect are frequent. This work validates the presence of the turbulent barrier effect and is an important foundation for its future parameterization, which will help to accurately identify the matter transport processes in the stable boundary layer and under extreme weather conditions, such as intense pollution events. |
| URI | http://hdl.handle.net/20.500.11897/642280 |
| ISSN | 2515-7620 |
| DOI | 10.1088/2515-7620/ac6381 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 环境科学与工程学院 环境模拟与污染控制国家重点联合实验室 |
