water uptake by fresh indonesian peat burning particles is limited by water-soluble organic matter
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2017
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Abstract
The relationship between hygroscopic properties and chemical characteristics
of Indonesian biomass burning (BB) particles, which are dominantly generated
from peatland fires, was investigated using a humidified tandem
differential mobility analyzer. In addition to peat, acacia (a popular
species at plantation) and fern (a pioneering species after disturbance by
fire) were used for experiments. Fresh Indonesian peat burning particles are
almost non-hygroscopic (mean hygroscopicity parameter, κ < 0.06) due
to predominant contribution of water-insoluble organics. The range of
κ spans from 0.02 to 0.04 (dry diameter = 100 nm,
hereinafter) for Riau peat burning particles, while that for Central
Kalimantan ranges from 0.05 to 0.06. Fern combustion particles are
more hygroscopic (κ = 0. 08), whereas the acacia burning particles have
a mediate κ value (0.04). These results suggest that κ is
significantly dependent on biomass types. This variance in κ is
partially determined by fractions of water-soluble organic carbon (WSOC), as
demonstrated by a correlation analysis (R = 0.65). κ of
water-soluble organic matter is also quantified, incorporating the 1-octanol–water
partitioning method. κ values for the water extracts are high,
especially for peat burning particles (A0 (a whole part of the water-soluble
fraction): κ = 0.18, A1 (highly water-soluble fraction): κ = 0.30). This result stresses the importance of both the WSOC fraction and
κ of the water-soluble fraction in determining the hygroscopicity of organic
aerosol particles. Values of κ correlate positively (R = 0.89) with
the fraction of m∕z 44 ion signal quantified using a mass spectrometric
technique, demonstrating the importance of highly oxygenated organic
compounds to the water uptake by Indonesian BB particles. These results
provide an experimentally validated reference for hygroscopicity of
organics-dominated particles, thus contributing to more accurate estimation
of environmental and climatic impacts driven by Indonesian BB particles on
both regional and global scales.
| Reference Key |
chen2017atmosphericwater
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|---|---|
| Authors | ;J. Chen;S. H. Budisulistiorini;M. Itoh;W.-C. Lee;W.-C. Lee;T. Miyakawa;Y. Komazaki;L. D. Q. Yang;L. D. Q. Yang;M. Kuwata;M. Kuwata;M. Kuwata |
| Journal | Journal of agricultural and food chemistry |
| Year | 2017 |
| DOI |
10.5194/acp-17-11591-2017
|
| URL | |
| Keywords |
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