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- Title
Mixing layer transport flux of particulate matter in Beijing, China.
- Authors
Yusi Liu; Guiqian Tang; Libo Zhou; Bo Hu; Baoxian Liu; Yunting Li; Shu Liu; Yuesi Wang
- Abstract
Quantifying the transport flux of atmospheric pollutants plays an important role in understanding the causes of atmospheric pollution and in making decisions regarding the prevention and control of atmospheric pollution. In this study, the mixing layer height and wind profile of the mixing layer were measured by ceilometer and doppler wind radar, respectively. The variation characteristics of atmospheric transport capacity (TC) were analyzed using these two datasets. The research showed that the TC appears to be strongest in spring (3940 ± 2110 m2 s−1) and weakens in summer (2953 ± 1322 m2 s−1), autumn (2580 ± 1601 m2 s−1) and winter (2913 ± 3323 m2 s−1). Combined with the near-surface fine particle concentration data, the TC influence on the PM2.5 concentration was studied, and there is a strong inverse correlation between the PM2.5 and TC in spring, autumn and winter (R = −0.66, −0.65 and −0.80, respectively) and a weak positive correlation in summer (R = 0.33). By calculating the transport flux of fine particles (TF), the TF in Beijing was found to be the highest in spring at 226 ± 294 mg m−1 s−1 and lower in the other three seasons at approximately 140 mg m−1 s−1. Transport occurs between 14:00 and 18:00 LT. Except for during spring, the TF was large in the pollution transition period (summer: 328 ± 280 mg m−1 s−1, autumn: 280 ± 336 mg m−1 s−1 and winter: 240 ± 297 mg m−1 s−1) and decreased during the heavy pollution period (summer: 295 ± 215 mg m−1 s−1, autumn: 243 ± 238 mg m−1 s−1 and winter: 212 ± 209 mg m−1 s−1). Our results indicate that the transportation influence in southern regions should receive more focus in the transition period of pollution, while local emissions should receive more focus in the heavy pollution period.
- Subjects
BEIJING (China); MIXING; CHEMICAL transportation; AIR pollution potential; PARTICULATE matter
- Publication
Atmospheric Chemistry & Physics Discussions, 2019, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2019-141