Spatial and temporal distribution and process analysis of PM2.5 pollution over Beijing during APEC
NIE Teng1, LI Xuan1, WANG Zhan-shan2, QI Jun1, ZHOU Zhen1
1. National Engineering Research Center for Urban Environmental Pollution Control, Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China;
2. Beijing Municipal Environmental Monitoring Center, Beijing 100048, China
Models-3/CMAQ modeling system was used to simulate the spatial and temporal distribution of PM2.5 pollution over Beijing during APEC, 2014(i.e. November 3 to 11, 2014). IPR, a process analysis tool embedded in CMAQ, was employed to quantify the contributions of different atmospheric processes to the PM2.5 formation at two typical sites (i.e. Guanyuan and Dingling) during two short-time pollution processes (i.e. Nov. 4 13:00 to Nov. 5 12:00 and Nov. 10 13:00 to Nov. 11 12:00). The results showed that CMAQ reproduced the temporal variation and magnitude of PM2.5 reasonably. Adverse synoptic system occurred on Nov. 4 and Nov. 10, resulting in two peak values of PM2.5 (188 μg/m3 and 124 μg/m3). Elevated PM2.5 levels didn't last long because of the pollution control measures and the cold anticyclone. During Nov. 4 13:00 to Nov. 5 12:00, horizontal transport was the primary contributor to the PM2.5 at both Guanyuan and Dingling, with a contribution rate of 49.6% and 90.9%, respectively, indicating that Beijing was mainly affected by pollution transported from southern areas. During Nov. 10 13:00 to Nov. 11 12:00, PM2.5 at Guanyuan site mainly came from local emission (78.8%), while PM2.5 at Dingling site mainly came from relatively weak horizontal transport, demonstrating a local pollution characteristic. Vertical transport played a dominative role in the decrease of PM2.5 in both pollution processes.
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NIE Teng, LI Xuan, WANG Zhan-shan, QI Jun, ZHOU Zhen. Spatial and temporal distribution and process analysis of PM2.5 pollution over Beijing during APEC. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(2): 349-355.
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