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Seasonal Characteristics of Black Carbon Aerosol and its Potential Source Regions in Baoji, China

Category: Urban Air Quality

Volume: 18 | Issue: 2 | Pages: 397-406
DOI: 10.4209/aaqr.2017.02.0070
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Bianhong Zhou1,2, Qiyuan Wang 2, Qi Zhou1, Zhangquan Zhang1, Gehui Wang2, Ni Fang1, Meijuan Li1, Junji Cao2,3

  • 1 Department of Geography and Environmental Engineering, Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji University of Arts and Sciences, Baoji 721013, China
  • 2 Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
  • 3 Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China

Highlights

Continuous measurements of BC were made at a mid-sized urban site in Baoji in 2015.
Both seasonal and diurnal variations of BC concentrations were significant..
Different potential source regions of BC for Baoji were found in each season.


Abstract

Continuous measurements of black carbon (BC) aerosol were made at a midsized urban site in Baoji, China, in 2015. The daily average mass concentrations varied from 0.6 to 11.5 µg m–3, with an annual mean value of 2.9 ± 1.7 µg m–3. The monthly variation indicated that the largest loading of BC occurred in January and the smallest in June. The mass concentrations exhibited strong seasonality, with the highest occurring in winter and the lowest in summer. The large BC loadings in winter were attributed to the increased use of fuel for domestic heating and to stagnant meteorological conditions, whereas the low levels in summer were related to the increase in precipitation. BC values exhibited similar bimodal diurnal patterns during the four seasons, with peaks occurring in the morning and evening rush hours and an afternoon trough, which was associated with local anthropogenic activities and meteorological conditions. A potential source contribution function model indicated that the effects of regional transport mostly occurred in spring and winter. The most likely regional sources of BC in Baoji were southern Shaanxi province, northwestern Hubei province, and northern Chongqing during spring, whereas the northeastern Sichuan Basin was the most important source region during winter.

Keywords

Black carbon aerosol Seasonal characterization Diurnal variation Potential source region


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