[Numerical Study on the Characteristics of Regional Transport of PM2.5 in Shandong Province During Spring in 2014].

In this paper, spatial and temporal distribution, transportation and deposition of PM2.5 in Shandong Province in Spring, 2014 were all analyzed by applying PSAT of CAMx model and we also developed a transport matrix of PM2.5 between different cities in Shandong. The results showed that ρ(PM2.5) presented obvious spatial distribution characteristics; ρ(PM2.5) was higher in the western part compared to that in peninsula and ρ(PM2.5) was mainly concentrated below 2 000 m in vertical direction. Simulated horizontal transport flux of PM2.5 was up to 110 µg.(m2.s)-1 and the total deposition amount of PM2.5 was 23. 05 x 10(4) t in Shandong during Spring, 2014. Analysis of regional contribution found that the pollutants mainly came from local districts and the average external transport contribution to the whole Shandong province was about 21. 08% ± 3. 83% while it was 40. 45% ± 5. 96% between different cities; the contribution rates of Jinjinji distrcit, background and boundary conditions gradually increased by 7. 56% and 6. 18% respectively as the altitude increased.