[1] We carried out a detailed size-resolved chemical characterization of particle emissions from the combustion of European conifer species, savanna grass, African hardwood, and German and Indonesian peat. Combustion particles were sampled using two sets of five-stage Berner-type cascade impactors after a buffer volume and a dilution tunnel. We determined the emission factors of water-soluble organic carbon (WSOC, 46-6700 mg kg À1 , sum of five stages), water-insoluble organic carbon (WISOC, 1300-6100 mg kg À1 ), (apparent) elemental carbon (ECa, 490-1800 mg kg À1 ), inorganic ions (68-400 mg kg À1 ), n-alkanes (0.38-910 mg kg À1 ), n-alkenes (0.45-180 mg kg À1 ), polycyclic aromatic hydrocarbons (PAHs) (1.4-28 mg kg À1 ), oxy-PAHs (0.08-1.0 mg kg À1 ), lignin decomposition products (59-620 mg kg À1 ), nitrophenols (1.4-31 mg kg À1 ), resin acids (0-110 mg kg À1 ), and cellulose and hemicellulose decomposition products (540-5900 mg kg À1 ). The combustion and particle emission characteristics of both of peat were significantly different from those of the other biofuels. Peat burning yielded significantly higher emission factors of total fine particles in comparison to the other biofuels. Very high emission factors of n-alkanes and n-alkenes were observed from peat combustion, which may be connected to the concurrently observed ''missing'' CCN in peat smoke. A highlevel ofmonosaccharide anhydrides, especiallylevoglucosan, wasdetectedfromall types of biofuel combustion. The fractions of monosaccharide anhydrides in the emitted total carbon were higher in smaller particles (aerodynamic diameter, D pa < 0.42 mm).

No abstract

No abstract

[1] We present the first results on optical properties (l $ 540 nm) of fresh aerosols from the combustion of Indonesian peat, German peat and other types of biomass, measured under controlled laboratory conditions. The mass scattering and mass absorption efficiencies for Indonesian and German peat aerosols are in the range of 6.0-8.1 and 0.04 -0.06 m 2 g À1 , respectively. A very high single scattering albedo (0.99) is observed for the peat smoke aerosols, reflecting the smoldering burning conditions (emission ratio, DCO/DCO 2 = 19 -50%). The relative increase in light scattering (f(RH)) due to an increase in relative humidity (RH) from 15% to 90% is very low (i.e., f(90) = 1.05) for both Indonesian and German peat aerosols. This value is considerably smaller than for aged Indonesian peat smoke particles (f(80) = 1.65) [Gras et al., 1999]. This suggests that atmospheric aging processes may be an important factor for aerosol hygroscopicity.