|
|
Relationship Between New Particle Formation Events and PM2.5 Pollution in Xi’an
ZHAO Kuifeng, PENG Yan
Journal of Arid Meteorology
2021, 39 (4):
593-602.
Based on the particle size distribution data measured by scanning mobility particle sizer model 3034 (SMPS-3034) from the field experiment station of aerosol and cloud microphysics for Qinling moutains, China Meteorological Administration during November 1-30 of 2017, the statistics characteristics of nine new particle formation (NPF) events were analyzed in Xi’an and the relationship between NPF and PM2.5 pollution was also discussed combining with three PM2.5 pollution cases. The results are as follows: (1) The NPF events started at noon or in the afternoon. The average value of growth rate of the mode particle diameter after NPF and net maximum increase in nucleation mode particles number concentration (NMINP) was 5.1±1.8 nm·h-1 and 0.63×104 cm-3, respectively. The NPF events contributed not only to the increase of nucleation mode particles number concentration, but also to the increase of Aitken mode and accumulation mode particles number concentrations. The 67 percent of the NPF events had a continuous growth in particle size, three of them had significant increasing in the mode particle diameter, the maximum value of which could reach to 175 nm. (2) There was an obvious increase of PM2.5 mass concentration with the growth of the mode particle diameter of the particles after NPF events. (3) The increase of PM2.5 mass concentration was positively correlated with the increase of mode particle diameter of the particles, the number concentrations of accumulation mode particles and the condensation sink during three processes from the NPF events to the PM2.5 pollution. When the mode particle diameter of the particles increased to 100-120 nm, the number concentration of accumulation mode particles continued higher than that of other two modes, the PM2.5 mass concentration was higher than 75 μg·m-3, and the PM2.5 pollution occurred.
Related Articles |
Metrics
|
|
