Characteristic of atmospheric heavy pollution episodes in Winter of Tianjin
XU Hong1, XIAO Zhi-mei1, KONG Jun1, YUAN Jie1, LI Peng1, GUAN Yu-chun1, DENG Xiao-wen1, ZHANG Yu-fen2, HAN Su-qin3
1. Tianjin Environmental Monitoring Center, Tianjin 300191, China;
2. Nankai University, Tianjin 300071, China;
3. Tianjin Research Institute of Meteorological Science, Tianjin 300074, China
To study the characteristics and causes of atmospheric heavy pollution episodes in winter of Tianjin, the concentrations of air pollutants, chemical characteristics of particulate matter and the meteorological parameters were analyzed in this study. The major conclusions were obtained as follows. During the heavy pollution episodes, the wind speeds kept below 4.0m/s the relative humidity were larger than 80%, and the mixing heights were only one third to one second of that in the clean days. The NO2/SO2 ratios were lower in heavy pollution days than that in clean days, and the NO3-/SO42- ratios were larger than 1during pollution days, indicating that both vehicle exhaust and stationary sources were dominant in Tianjin. Compared to clean days, the PM2.5/PM10 ratios during the heavy pollution episodes were larger while the PM1/PM2.5 ratios were relatively lower, probably because of the hygroscopic behavior of fine particles and the coarse particles from coal combustion. At the beginning of pollution processes, the NOR values were larger than SOR, however, as the development of pollution, the SOR values exceeded NOR due to the limit of ammonia's concentration, indicating that more attention should be focused on gaseous precursors especially sulfur dioxides. OC and EC were weakly correlated when both of them have high concentrations. SOC contributed 20% to 54% of OC, indicating that the residential bulk coal burning and secondary organic reactions greatly affected heavy pollution episodes.
Lee Y J, Jo W K, Chun H H. Characteristics of Atmospheric Visibility and Its Relationship with Air Pollution in Korea[J]. Journal of Environmental Quality, 2014,43(5):1519-1526.
Kampa M, Castanas E. Human health effects of air pollution[J]. Environment Polluttion, 2008,151(2):362-367.
[6]
Laden F, Neas L M, Dockery D W, et al. Association of fine particulate matter from different sources with daily mortality in six US cities[J]. Environmental Health Perspectives, 2000, 108(10):941-947.
[7]
Miller K A, Siscovick D S, Sheppard L, et al. Long-term exposure to air pollution and incidence of cardiovascular events in women[J]. The New England Jounal of Medicine, 2007, 356(5):447-458.
[8]
Yu H L, Wang C H. Retrospective prediction of intra-urban spatiotemporal distribution of PM2.5 in Taipei[J]. Atmospheric Environment, 2010,44 (25):3053-3065.
[9]
Ji D S, Wang Y S, Wang L L, et al. Analysis of heavy pollution episodes in selected cities of northern China[J]. Atmospheric Environment, 2012,50:338-348.
Wang LL, Wang YS, Sun Y, et al. Using Synoptic Classification and Trajectory Analysis to Assess Air Quality during the Winter Heating Period in Urumqi, China[J]. Advance in Atmospheric Sciences, 2012,29(2):307-319.
Miao Y H, Hu X M, Liu S H, et al. Seasonal variation of local atmospheric circulations and boundary layer structure in the Beijing-Tianjin-Hebei region and implications for air quality[J]. Journal of Advances in Modeling Earth Systems, 2015,7(4):1602-1626.
[20]
Lang J L, Cheng S Y, Wei W, et al. A study on the trends of vehicular emissions in the Beijing-Tianjin-Hebei (BTH) region, China[J]. Atmospheric Environment, 2012,62:605-614.
[21]
Wang G, Cheng S Y, Li J B, et al. Source apportionment and seasonal variation of PM2.5 carbonaceous aerosol in the Beijing-Tianjin-Hebei Region of China[J]. Environmental Monitoring and Assessment, 2015,187:143.
Liu P F, Zhao C S, Göbel T, et al. Hygroscopic properties of aerosol particles at high relative humidity and their diurnal variations in the North China Plain[J]. Atmospheric Chemistry and Physics, 2011,11:3479-3494.
[25]
Kumar P, Hopke P K, Raja S, et al. Characterization and heterogeneity of coarse particles across an urban area[J]. Atmospheric Environment, 2012,46:449-459.
[26]
Lagudu U R K, Raja S, Hopke P K, et al. Heterogeneity of coarse particles in an urban area[J]. Environmental Science and Technology, 2011,45:3288-3296.
[27]
Sinha P R, Manchanda R K, Kaskaoutis D G., et al.. Spatial heterogeneities in aerosol size distribution over Bay of Bengal during Winter-ICARB Experiment[J]. Atmospheric Environment, 2011,45(27):4695-4706.
Wang Y, Zhuang G S, Zhang X Y, et al. The ion chemistry, seasonal cycle, and sources of PM 2.5 and TSP aerosol in Shanghai[J]. Atmospheric Environment, 2006,40:2935-2952.
[31]
Wang Y, Zhuang G S, Tang A H, et al. The ion chemistry and the source of PM2.5 aerosol in Beijing[J]. Atmospheric Environment, 2005,39:3771-3784.
Vu T V, Delgado-Saborit J M, Harrison R M. Review:Particle number size distributions from seven major sources and implications for source apportionment studies[J]. Atmospheric Environment, 2015,122:114-132.
[36]
Seames W S. An initial study of the fine fragmentation fly ash particle mode generated during pulverized coal combustion[J]. Fuel Processing Technology, 2003,81(2):109-125.
[37]
Faloona I. Sulfur processing in the marine atmospheric boundary layer:A review and critical assessment of modeling uncertainties[J]. Atmospheric Environment, 2009,43(18):2841-2854.
Seinfeld J H, Pandis S N. Atmospheric Chemistry and Physics:From Air Pollution to Climate Change. 2nd ed[M]. Hoboken, New Jersey:John Wiley & Sons. 2012:491-544.
Zhao P S, Dong F, Yang Y D, et al. Characteristics of carbonaceous aerosol in the region of Beijing, Tianjin, and Hebei, China[J]. Atmospheric Environment, 2013,71:389-398.
[44]
Rehman I H, Ahmed T, Praveen P S, et al. Black carbon emissions from biomass and fossil fuels in rural India[J]. Atmospheric Chemistry and Physics, 2011,11:7289-7299.
[45]
Liu J, Mauzeradll D L, Chen Q, et al. Air pollutant emissions from Chinese households:A major and underappreciated ambient pollution source[J]. PANS, 2016,113(28):7756-7761.
[46]
Carter S M, Shan M, Yang X D, et al. Pollutant Emissions and Energy Efficiency of Chinese Gasifier Cooking Stoves and Implications for Future Intervention Studies[J]. Environmental Science and Technology, 2014,48:6461-6467.
[47]
He G L, Ying B, Liu J, et al. Patterns of Household Concentrations of Multiple Indoor Air Pollutants in China[J]. Environmental Science and Technology, 2005,39:991-998.
[48]
Shen G F, Yang Y F, Wang W, et al. Emission Factors of Particulate Matter and Elemental Carbon for Crop Residues and Coals Burned in Typical Household Stoves in China[J]. Environmental Science and Technology, 2010,44:7157-7162.
[49]
Huang R J, Zhang Y L, Bozzetti C, et al. High secondary aerosol contribution to particulate pollution during haze events in China[J]. Nature, 2014,514(7521):218-222.
[50]
Lin J J, Tai H S. Concentrations and distributions of carbonaceous species in ambient particles in Kaohsiung City, Taiwan[J]. Atmospheric Environment, 2001,35(15):2627-2636.
[51]
Chow J C, Watson J G, Lu Z, et al. Descriptive analysis of PM2.5and PM10at regionally representative locations during SJVAQS/AUSPEX[J]. Atmospheric Environment, 1996,30(12):2079-2112.
[52]
吴 琳.降低二次有机碳对大气颗粒物源解析影响的研究[D]. 天津:南开大学, 2010.
[53]
Cao J J, Lee S C, Ho K F, et al. Spatial and seasonal variations of atmospheric organic carbon and elemental carbon in Pearl River Delta Region, China[J]. Atmospheric Environment, 2004,38(27):4447-4456.