Ambient measurement of fluorescent aerosol particles with a WIBS in the Yangtze River Delta of China: potential impacts of combustion-related aerosol particles
Fluorescence characteristics of aerosol particles in a polluted atmosphere were studied using a wideband integrated bioaerosol spectrometer (WIBS-4A) in Nanjing, Yangtze River Delta area of China. We observed strong diurnal and day-to-day variations of fluorescent aerosol particles (FAPs). The av...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-09-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/11337/2016/acp-16-11337-2016.pdf |
| Summary: | Fluorescence characteristics of aerosol particles in a polluted atmosphere were
studied using a wideband integrated bioaerosol spectrometer (WIBS-4A) in
Nanjing, Yangtze River Delta area of China. We observed strong diurnal and
day-to-day variations of fluorescent aerosol particles (FAPs). The average
number concentrations of FAPs (1–15 µm) detected in the three WIBS
measurement channels (FL1: 0.6 cm<sup>−3</sup>, FL2: 3.4 cm<sup>−3</sup>, FL3:
2.1 cm<sup>−3</sup>) were much higher than those observed in forests and rural
areas, suggesting that FAPs other than bioaerosols were detected. We found
that the number fractions of FAPs were positively correlated with the black
carbon mass fraction, especially for the FL1 channel, indicating a large
contribution of combustion-related aerosols. To distinguish bioaerosols from
combustion-related FAPs, we investigated two classification schemes for use
with WIBS data. Our analysis suggests a strong size dependence for the
fractional contributions of different types of FAPs. In the FL3 channel,
combustion-related particles seem to dominate the 1–2 µm size
range while bioaerosols dominate the 2–5 µm range. The number fractions of
combustion-related particles and non-combustion-related particles to total
aerosol particles were ∼ 11 and ∼ 5 %, respectively. |
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| ISSN: | 1680-7316 1680-7324 |