Preprints
https://doi.org/10.5194/acp-2021-725
https://doi.org/10.5194/acp-2021-725

  03 Sep 2021

03 Sep 2021

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

Development and application of a street-level meteorology and pollutant tracking system (S-TRACK)

Huan Zhang1,2, Sunling Gong1, Lei Zhang1, Jianjun He1, Yaqiang Wang1, Lixin Shi2,3, Jingyue Mo1, Huabing Ke1, and Shuhua Lu1 Huan Zhang et al.
  • 1State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 2Key Laboratory of Meteorology and Ecological Environment of Hebei Province, Shijiazhuang 050000, China
  • 3Meteorological Institute of Hebei Province, Shijiazhuang 050000, China

Abstract. A multi-model simulation system for street level circulation and pollutant tracking (S-TRACK) has been developed by integrating the Weather Research and Forecasting (WRF), the Computational Fluid Dynamics (CFD) and the Flexible Particle (FLEXPART) models. The winter wind environmental characteristics and the potential impact of a traffic source on nearby sites (about 300 to 400 m) in Jinshui district of Zhengzhou, China are analyzed with the system. It is found that the existence of buildings complicates the structure of the wind fields. The wind speed inside the building block is smaller than the background wind speed due to the dragging effect of dense buildings. Ventilation is better when the dominant airflow is in the same direction as the building layout. Influenced by the building layout, local circulations show that the windward side of the building is mostly the divergence zone and the leeward side is mostly the convergence zone, which is more obvious for high buildings and influencing air pollution transport at the street-level. Using the traffic source (line source) on a road within a city block, the system was applied to investigate the potential impact of a line source on specific sites under the influence of the streel-level circulations. The potential contribution ratio was estimated by the method of residence time analysis and to a particular site found to vary with the height of the site with a peak not at the ground but on a certain height. The results of the study are helpful to understand the characteristics of wind environment and effect of traffic emissions in the area, which is important to improve urban living environment and control air pollution.

Huan Zhang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-725', Anonymous Referee #1, 19 Sep 2021
  • RC2: 'Comment on acp-2021-725', Anonymous Referee #2, 04 Oct 2021

Huan Zhang et al.

Huan Zhang et al.

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Short summary
This study established a multi-model simulation system for street level circulation and pollutant tracking, and applied to real building scenarios and atmospheric conditions. Results showed that to a particular site the potential contribution ratio vary with the height of the site with a peak not at the ground but on a certain height. The work is of significance for urban planning and improvement of urban air quality.
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