Journal
ATMOSPHERIC ENVIRONMENT
Volume 132, Issue -, Pages 11-18Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2016.02.031
Keywords
Black carbon; Concentration weighted trajectory analysis; WRF-BC model; Regional transport; Beijing
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05000000]
- National Natural Science Foundation of China [41275186, 41430424]
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The mass concentrations of atmospheric refractory black carbon (rBC), an important absorber of solar radiation, were continuously measured with a single particle soot photometer (SP2) during wintertime haze period to investigate the transport of pollution to Beijing. The average mass concentration of rBC was 6.1 +/- 3.9 mu g m(-3) during hazy periods, which was 4.7 times higher than it during non-hazy periods. Cluster analysis showed that the air parcels arriving at Beijing mainly originated from the northwest, passed through the south and brought the most polluted air to Beijing. Concentration-weighted trajectory analyses indicated that the central North China Plain were the most likely source region for the rBC that impacted Beijing. Furthermore, the Weather Research and Forecasting-Black Carbon model showed that 71.4-82.0% of the rBC at Beijing was from regional transport during the high rBC episodes and that 47.9-56.8% of the rBC can be attributed to sources in the central North China Plain. These results suggest that regional transport from the central North China Plain, rather than local emissions, was a more important source for rBC pollution in Beijing. (C) 2016 Elsevier Ltd. All rights reserved.
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