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The relationship between hygroscopic properties and chemical characteristicsof Indonesian biomass burning (BB) particles, which are dominantly generatedfrom peatland fires, was investigated using a humidified tandemdifferential mobility analyzer. In addition to peat, acacia (a popularspecies at plantation) and fern (a pioneering species after disturbance byfire) were used for experiments. Fresh Indonesian peat burning particles arealmost non-hygroscopic (mean hygroscopicity parameter, κ < 0.06) dueto predominant contribution of water-insoluble organics. The range ofκ spans from 0.02 to 0.04 (dry diameter = 100 nm,hereinafter) for Riau peat burning particles, while that for CentralKalimantan ranges from 0.05 to 0.06. Fern combustion particles aremore hygroscopic (κ = 0. 08), whereas the acacia burning particles havea mediate κ value (0.04). These results suggest that κ issignificantly dependent on biomass types. This variance in κ ispartially determined by fractions of water-soluble organic carbon (WSOC), asdemonstrated by a correlation analysis (R = 0.65). κ ofwater-soluble organic matter is also quantified, incorporating the 1-octanol–waterpartitioning method. κ values for the water extracts are high,especially for peat burning particles (A0 (a whole part of the water-solublefraction): κ = 0.18, A1 (highly water-soluble fraction): κ = 0.30). This result stresses the importance of both the WSOC fraction andκ of the water-soluble fraction in determining the hygroscopicity of organicaerosol particles. Values of κ correlate positively (R = 0.89) withthe fraction of m∕z 44 ion signal quantified using a mass spectrometrictechnique, demonstrating the importance of highly oxygenated organiccompounds to the water uptake by Indonesian BB particles. These resultsprovide an experimentally validated reference for hygroscopicity oforganics-dominated particles, thus contributing to more accurate estimationof environmental and climatic impacts driven by Indonesian BB particles onboth regional and global scales

Water uptake by fresh Indonesian peat burning particles is limited by water-soluble organic matter