The characteristics of PM2.5、Reactive gas and aerosol Size Distributions of Beijing from 2013 to 2015
JIANG Qi1, WANG Fei2, ZHANG Heng-de1, WANG Fei3, LÜ Meng-yao1, HE Jia-bao4
1. National Meteorological Centre, Beijing 100081, China;
2. Chinese Academy of Meteorological Sciences, Beijing 100081, China;
3. Beijing Municipal Weather Modification Office, Beijing 100089, China;
4. Environment Monitoring Center of Ningbo 315012, China
PM2.5, gas composition, aerosol spectral distribution and meteorological conditions were systematically analyzed during 2013~2015 in Beijing. Results showed that the PM2.5 mass concentration decreased significantly from 2013 to 2015, and the air quality improved significantly. The contribution of traffic sources to air pollution can not be neglected and tended to increase gradually. The influence of humidity and wind speed on PM2.5 concentration was relatively fast and the biggest influence on PM2.5 concentration was about 1h time lag. While the PM2.5 response to temperature changes was relatively slow, generally after time lag 7~8h before the effect reached to the maximum. The particle size distribution of aerosols moved to the larger size in pollution days than cleaning days. On cleaning days, the diameter of the peak area was concentrated at 3~5nm, and increased to 100~200nm on pollution days. With the increasing of precipitation level, the peak concentration of aerosol gradually developed towards to the accumulation mode. During the pollution process, from February 18 to February 21 in 2015, the contribution of fireworks to aerosol concentration was 26.1% in fireworks time, and accompanied with new particle generation. The discharged of fireworks produced significant peaks in the Accumulation mode and the Aitken mode particles, the Nuclear mode particle concentration changed not much.
江琪, 王飞, 张恒德, 王飞, 吕梦瑶, 何佳宝. 2013~2015年北京市PM2.5、反应性气体和气溶胶粒径的特性分析[J]. 中国环境科学, 2017, 37(10): 3647-3657.
JIANG Qi, WANG Fei, ZHANG Heng-de, WANG Fei, LÜ Meng-yao, HE Jia-bao. The characteristics of PM2.5、Reactive gas and aerosol Size Distributions of Beijing from 2013 to 2015. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(10): 3647-3657.
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