Preprints
https://doi.org/10.5194/acp-2021-435
https://doi.org/10.5194/acp-2021-435

  07 Jul 2021

07 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

Impact of modified turbulent diffusion of PM2.5 aerosol in WRF-Chem simulations in Eastern China

Wenxing Jia1,2 and Xiaoye Zhang2,3 Wenxing Jia and Xiaoye Zhang
  • 1Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, 210044, China
  • 2Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
  • 3Center for Excellence in Regional Atmospheric Environment, IUE, Chinese Academy of Sciences, Xiamen, 361021, China

Abstract. Correct description of the boundary layer mixing process of particle is an important prerequisite to understanding the mechanism of heavy pollution episodes. Turbulent mixing process of particles is usually denoted by the turbulent diffusion relationship of heat, meaning that the turbulent transport of particles and heat are similar. This similarity has, however, never been verified. Here we investigate the dissimilarity between particles and heat, indicating that the unified treatment of all scalars in the model is questionable. Using mixing-length theory, the turbulent diffusion relationship of particle is established, embedded in the model and verified on a long-term scale. Simulated results of PM2.5 concentration were improved by 8.3 % (2013), 17 % (2014), 11 % (2015) and 11.7 % (2017) in Eastern China, respectively. However, under the influence of complex topography, the turbulent diffusion process is insensitive to the simulation of the pollutant concentration. In addition to the PM2.5 concentration, the simulation of the CO concentration has also been improved, which shows that the turbulent diffusion process is extremely critical to the change in the concentration of pollutants.

Wenxing Jia and Xiaoye Zhang

Status: open (until 18 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-435', Anonymous Referee #2, 22 Jul 2021 reply
  • RC2: 'Comment on acp-2021-435', Peter A. Taylor, 28 Jul 2021 reply

Wenxing Jia and Xiaoye Zhang

Wenxing Jia and Xiaoye Zhang

Viewed

Total article views: 226 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
174 50 2 226 10 0 0
  • HTML: 174
  • PDF: 50
  • XML: 2
  • Total: 226
  • Supplement: 10
  • BibTeX: 0
  • EndNote: 0
Views and downloads (calculated since 07 Jul 2021)
Cumulative views and downloads (calculated since 07 Jul 2021)

Viewed (geographical distribution)

Total article views: 224 (including HTML, PDF, and XML) Thereof 224 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 28 Jul 2021
Download
Short summary
Heavy aerosol pollution incidents have attracted much attention since 2013, but the temporal and spatial limitations of observations and the inaccuracy of simulation are a stumbling block of assessing pollution mechanisms. The correct simulation of boundary layer mixing process of pollutant is a challenge for mesoscale numerical models.
Altmetrics