Journal
AEROSOL AND AIR QUALITY RESEARCH
Volume 18, Issue 2, Pages 397-406Publisher
TAIWAN ASSOC AEROSOL RES-TAAR
DOI: 10.4209/aaqr.2017.02.0070
Keywords
Black carbon aerosol; Seasonal characterization; Diurnal variation; Potential source region
Categories
Funding
- National Natural Science Foundation of China [41503118, 41325014]
- Strategic Priority Research Program of the CAS [XDB05020401]
- Science and Technology Coordinating Innovative Engineering Projects of Shaanxi Province [2016KTCL03-17]
- Baoji University of Arts and Sciences Key Research Project [14031]
- China Postdoctoral Science Foundation [2015M580890]
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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 mu g m(-3), with an annual mean value of 2.9 +/- 1.7 mu g 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.
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