Source apportionment and dynamic changes of carbonaceous aerosols during the haze bloom-decay process in China based on radiocarbon and organic molecular tracers
Fine carbonaceous aerosols (CAs) is the key factor influencing the currently filthy air in megacities in China, yet few studies simultaneously focus on the origins of different CAs species using specific and powerful source tracers. Here, we present a detailed source apportionment for various CAs...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/2985/2016/acp-16-2985-2016.pdf |
| Summary: | Fine carbonaceous aerosols (CAs) is the key factor influencing the currently
filthy air in megacities in China, yet few studies simultaneously focus on
the origins of different CAs species using specific and powerful source
tracers. Here, we present a detailed source apportionment for various CAs
fractions, including organic carbon (OC), water-soluble OC (WSOC),
water-insoluble OC (WIOC), elemental carbon (EC) and secondary OC (SOC) in
the largest cities of North (Beijing, BJ) and South China (Guangzhou, GZ), using the measurements of radiocarbon and anhydrosugars.
Results show that non-fossil fuel sources such as biomass burning and
biogenic emission make a significant contribution to the total CAs in Chinese
megacities: 56 ± 4 in BJ and 46 ± 5 % in GZ, respectively.
The relative contributions of primary fossil carbon from coal and liquid
petroleum combustions, primary non-fossil carbon and secondary organic carbon
(SOC) to total carbon are 19, 28 and 54 % in BJ, and 40, 15 and 46 %
in GZ, respectively. Non-fossil fuel sources account for 52 in BJ and
71 % in GZ of SOC, respectively. These results suggest that biomass
burning has a greater influence on regional particulate air pollution in
North China than in South China. We observed an unabridged haze bloom-decay
process in South China, which illustrates that both primary and secondary
matter from fossil sources played a key role in the blooming phase of the
pollution episode, while haze phase is predominantly driven by fossil-derived
secondary organic matter and nitrate. |
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| ISSN: | 1680-7316 1680-7324 |