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Mass concentrations of black carbon measured by four instruments in the middle of Central East China in June 2006

Y. Kanaya,Y. Komazaki,P. Pochanart,Y. Liu,H. Akimoto,Jian Gao,Tao Wang,Z. Wang

Published 2008 in Atmospheric Chemistry and Physics

ABSTRACT

Mass concentrations of black carbon (BC) were determined in June 2006 at the top of Mount Tai (36.26 N, 117.11 E, 1534 m a.s.l.), located in the middle of Central East China, using four different instruments: a multi-angle absorption photometer (5012 MAAP, Thermo), a particle soot absorption photometer (PSAP, Radiance Research), an ECOC semi-continuous analyzer (Sunset Laboratory) and an Aethalometer (AE-21, Magee Scientific). High correlation coefficients ( R 2 >0.88) were obtained between the measure- ments of the BC mass concentrations made using the dif- ferent instruments. From the range of the slopes of the lin- ear least-square fittings, we concluded that BC concentra- tions regionally-representative of the area were measured in a range with a maximum-to-minimum ratio of 1.5 (an excep- tion was that the BC (PM2.5) concentrations derived from MAAP were 2 times higher than the optical measurements (PM2.5) derived from the ECOC analyzer). While this range is significant, it is still sufficiently narrow to better constrain the large and highly uncertain emission rate of BC from Cen- tral East China. In detail, two optical instruments (the MAAP and the PSAP equipped with a heated inlet 400 C) tended to give higher concentrations than the thermal EC concen- trations observed by the ECOC analyzer. The ratios of op- tical BC to thermal EC showed a positive correlation with the OC/EC ratio reported by the ECOC analyzer, suggest- ing two explanations. One is that the optical instruments overestimated BC concentrations in spite of careful cancella- tion of the scattering effect in the MAAP instrument and the

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