HR: 0800h
AN: A41D-0734    [Abstracts]
TI: Measurements of Mass Concentrations of Black Carbon by Using Four Instruments at the Summit of Mount Tai, in the Center of the North China Plain in June 2006
AU: * Kanaya, Y
EM: yugo@jamstec.go.jp
AF: Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 2360001, Japan
AU: Komazaki, Y
EM: y-komazaki@jamstec.go.jp
AF: Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 2360001, Japan
AU: Pochanart, P
EM: pakpong@jamstec.go.jp
AF: Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 2360001, Japan
AU: Liu, Y
EM: yuliu@jamstec.go.jp
AF: Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 2360001, Japan
AU: Akimoto, H
EM: akimoto@jamstec.go.jp
AF: Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, 2360001, Japan
AU: Gao, J
EM: duncan_gao@yahoo.com
AF: Environment Research Institute, Shandong University, Jinan, Shandong, 250100, China
AU: Wang, T
EM: cetwang@polyu.edu.hk
AF: Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, NA, China
AU: Wang, Z
EM: zifawang@mail.iap.ac.cn
AF: Institute of Atmospheric Physics, Chinese Academy of Sciences, Chaoyang Districts, Beijing, 10029, China
AB: Although the emission rate of black carbon (BC) aerosols from the North China Plain (NCP) has been estimated to be high and it would impact climate severely, the BC mass concentrations at a regionally representative location in the plain have been scarcely observed. During a comprehensive field campaign performed at the summit of Mount Tai (36.26 N, 117.11 E, 1534 m asl) in June 2006, BC (or elemental carbon, EC) concentrations were measured by four instruments: an Aethalometer, a Multi-Angle Absorption Photometry (MAAP) instrument, a Particle Soot Absorption Photometer, and a semi-continuous ECOC analyzer with two thermal protocols (IMPROVE and NIOSH). The hourly BC concentration (PM2.5) as measured by the MAAP instrument ranged from -0.1 to 40.8 μgC m^-3, with an average of 3.7 μgC m^-3. For both of the first 20-day and the latter 10-day periods during the campaign, for which all the instruments provided PM1 and PM2.5 measurements, respectively, we found strong correlations (R² >0.88) for all the pairs with which >30 hours of coincident observations were made. The slopes and the intercept values of regression lines ranged from 1.00 to 1.42 and from -0.2 to +0.8 μgC m^-3, respectively. This general agreement suggested that we were able to determine the BC concentrations regionally representative over the NCP with an uncertainty of ±50% and thereby reduce the uncertainty factor of >4 associating with the BC emission rate from China. The temporal variation of BC concentrations in June 2006 was dominated by the influence from crop (winter wheat) residue burning after the harvest. The relative importance of BC in comparison to CO₂ in terms of heating of the atmosphere over this region is also discussed.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting