Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-136
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
27 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Water Uptake by Fresh Indonesian Peat Burning Particles is Limited by Water Soluble Organic Matter
Jing Chen1, Sri Hapsari Budisulistiorini1, Masayuki Itoh2, Wen-Chien Lee1,3, Takuma Miyakawa4, Yuichi Komzaki4, LiuDongQing Yang1, and Mikinori Kuwata1,2 1Earth Observatory of Singapore, Nanyang Technological University, Singapore
2Center for Southeast Asian Studies, Kyoto University, Japan
3Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore
4Japan Agency for Marine Science and Technology, Japan
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 the 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 κ = 0.02–0.04 (dry diameter = 100 nm, hereinafter) for Riau peat burning particles, while that for Central Kalimantan ranges from κ = 0.05–0.06. 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 water-soluble fraction): κ = 0.18, A1 (highly water-soluble fraction): κ = 0.30). This result stresses the importance of both WSOC fraction and κ of water soluble fraction in determining hygroscopicity of organic aerosol particles. Values of κ correlate positively (R = 0.89) with fraction of m / z 44 ion signal quantified using a mass spectrometric technique, demonstrating the importance of highly oxygenated organic compounds in controlling hygroscopicity of Indonesian BB particles. These results can be further utilized for investigating environmental and climatic impacts of Indonesian BB particles in both regional and global scales.

Citation: Chen, J., Budisulistiorini, S. H., Itoh, M., Lee, W.-C., Miyakawa, T., Komzaki, Y., Yang, L., and Kuwata, M.: Water Uptake by Fresh Indonesian Peat Burning Particles is Limited by Water Soluble Organic Matter, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-136, in review, 2017.
Jing Chen et al.
Jing Chen et al.
Jing Chen et al.

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Short summary
We report size-dependent water uptake by fresh Indonesian peat burning particles, and discuss relationship between their water uptake and chemical characteristics. Fresh Indonesian peat burning particles are almost non-hygroscopic, which is determined by both water-soluble organic fraction and difference in hygroscopicity of slightly and highly water-soluble fractions. This study deepens our understanding, and reported results can be further applied in both regional and global climate models.
We report size-dependent water uptake by fresh Indonesian peat burning particles, and discuss...
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