Characteristics and Source Analysis of Atmospheric Carbonaceous Aerosols in the Cities of Hangzhou and Ningbo

被引：3
|
作者：
Xu H.-H. [1 ]
Xu J.-S. [2 ]
He J. [1 ]
Pu J.-J. [1 ]
Qi B. [3 ]
Du R.-G. [3 ]
机构：
[1] Zhejiang Institute of Meteorological Sciences, Hangzhou
[2] Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo
[3] Hangzhou Meteorological Bureau, Hangzhou
来源：
Huanjing Kexue/Environmental Science | 2018年 / 39卷 / 08期
关键词：
Cities of Hangzhou and Ningbo; Elemental carbon(EC); Organic carbon(OC); PM [!sub]2.5[!/sub; Sources;
D O I：
10.13227/j.hjkx.201712245
中图分类号：
学科分类号：
摘要：
To investigate the seasonal variations and sources of carbonaceous aerosols in the cities of Hangzhou and Ningbo, field PM 2.5 sampling was conducted at four representative sites (two urban, one suburban, and one rural) in this region from December 2014 to November 2015. A thermal/optical carbon analyzer was employed to analyze both organic carbon (OC) and elemental carbon (EC) contents in PM 2.5 by identifying eight different carbon fractions, including OC1, OC2, OC3, OC4+OPC, EC1-OPC, EC2, and EC3. Based on these fractions, OC and EC were defined as OC1+OC2+OC3+OC4+OPC and EC1+EC2+EC3-OPC, respectively; total carbon (TC) was calculated as the sum of OC and EC; and total carbonaceous aerosols (TCAs) were quantified via the sum of organic aerosols (OAs; converted from OC) and EC. The results showed the following. ①The annual average level of TC in this region was (14.3±4.1) μg•m -3 , accounting for (26.2±6.5)% of the annual average PM 2.5 concentration. The annual average OC and EC concentrations were (11.3±3.4) μg•m -3 and (3.0±0.9) μg•m -3 , respectively. The highest TC level was observed in winter among the four seasons. ②The annual average TCA concentration in this region was (25.6±7.5) μg•m -3 , contributing (42.2±10.0)% of PM 2.5 . In addition, secondary organic carbon (SOC) was also estimated by the commonly applied EC method. It was found that SOC contributed (41.1±5.5)% to OC on an annual average basis. ③The sources of carbonaceous aerosols were determined using the correlation between OC and EC, OC/EC mass ratio, and different carbon fraction characteristics. The annual average OC/EC ratio in this region was 4.7±1.7, which falls in the diagnostic ratio range for vehicular emissions, coal combustion, and biomass burning, indicating these sources are probably the major contributors of the regional carbonaceous aerosols. Moreover, a higher char-EC/soot-EC ratio was observed during winter and autumn at all sites, possibly implying the enhanced biomass burning activities during these two seasons. © 2018, Science Press. All right reserved.
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页码：3511 / 3517
页数：6
相关论文
共 46 条
  • [1] Seinfeld J.H., Pandis S.N., Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, (1998)
  • [2] Bae M.S., Shin J.S., Lee K.Y., Et al., Long-range transport of biomass burning emissions based on organic molecular markers and carbonaceous thermal distribution, Science of the Total Environment, 466-467, pp. 56-66, (2014)
  • [3] Ramanathan V., Carmichael G., Global and regional climate changes due to black carbon, Nature Geoscience, 1, 4, pp. 221-227, (2008)
  • [4] Chameides W.L., Yu H., Liu S.C., Et al., Case study of the effects of atmospheric aerosols and regional haze on agriculture: an opportunity to enhance crop yields in China through emission controls?, Proceedings of the National Academy of Sciences of the United States of America, 96, 24, pp. 13626-13633, (1999)
  • [5] Hansen J., Sato M., Ruedy R., Et al., Efficacy of climate forcings, Journal of Geophysical Research: Atmospheres, 110, D18, (2005)
  • [6] Qiu J.H., Yang L.Q., Variation characteristics of atmospheric aerosol optical depths and visibility in North China during 1980-1994, Atmospheric Environment, 34, 4, pp. 603-609, (2000)
  • [7] Feng Y.L., Chen Y.J., Guo H., Et al., Characteristics of organic and elemental carbon in PM <sub>2.5</sub> samples in Shanghai, China , Atmospheric Research, 92, 4, pp. 434-442, (2009)
  • [8] Safai P.D., Raju M.P., Rao P.S.P., Et al., Characterization of carbonaceous aerosols over the urban tropical location and a new approach to evaluate their climatic importance, Atmospheric Environment, 92, pp. 493-500, (2014)
  • [9] Ackerman A.S., Toon O.B., Taylor J.P., Et al., Effects of aerosols on cloud albedo: evaluation of Twomey's parameterization of cloud susceptibility using measurements of ship tracks, Journal of the Atmospheric Sciences, 57, 16, pp. 2684-2695, (2000)
  • [10] Liu Z.J., Wu J.H., Zhang Y.F., Et al., Seasonal variation of carbon fractions in PM <sub>2.5</sub> in Heze , Environmental Science, 38, 12, pp. 4943-4950, (2017)
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