Transpacific transport of benzo[a]pyrene emitted from Asia

doi:10.5194/acp-11-11993-2011

CORC > 北京大学 > 城市与环境学院

	Transpacific transport of benzo[a]pyrene emitted from Asia
	Zhang, Y. ; Tao, S. ; Ma, J. ; Simonich, S.
刊名	atmospheric chemistry and physics
	2011
关键词	POLYCYCLIC AROMATIC-HYDROCARBONS LONG-RANGE TRANSPORT SEMIVOLATILE ORGANIC-COMPOUNDS LUNG-CANCER RISK ATMOSPHERIC TRANSPORT PART 2 SEASONAL-VARIATIONS GLOBAL DISTRIBUTION EMISSION INVENTORY WINTER MONSOON
DOI	10.5194/acp-11-11993-2011
英文摘要	A global-scale three dimensional atmospheric transport and chemistry model was applied to simulate transpacific transport of Benzo[a]pyrene (BaP) emitted from Asia. The model results were compared with observations at six monitoring sites. The annual mean and seasonal variation of transport patterns and the contributions of different Asian source regions to transpacific transport flux were investigated. The episodic nature of transpacific transport was also systematically explored. Interannual variability of transpacific transport of BaP was also assessed during the period of 1948-2007. Results showed that strong enhancements of modeled BaP occurred in an area bounded by 70-80 degrees E and 100-120 degrees E. Air containing these elevated BaP concentrations was then delivered eastward by westerly winds. When approaching the West Coast of North America, the descending atmospheric motion carried BaP-laden air into the lower atmosphere. The transpacific transport flux was 1.6 times higher in the winter than in the summer. East Asian emission dominates the transpacific transport flux with a contribution of about 97 %. Near ground concentration of BaP induced by Asian sources in North America varied between 1-20 pg m(-3). A case study for observation at Cheeka Peak Observatory during March 2002-May 2002 reveals the importance of warm conveyor belt for transpacific transport. The number of days with transpacific transport flux with a factor of 0.5, 1.0, 1.5, and 2.0 larger than the running mean were 9.4 %, 0.72 %, 0.06% and 0.01 %, respectively, implying a mild contribution of episodic transport to the long-term mean transport flux. Significant interannual fluctuation of transpacific transport of BaP was found, including a general decreasing trend during 1948-2007, and especially after the 1970s. The transpacific transport was found to be positively correlated with the Southern Oscillation Index.; Meteorology & Atmospheric Sciences; SCI(E); 8; ARTICLE; 23; 11993-12006; 11
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/322357]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Zhang, Y.,Tao, S.,Ma, J.,et al. Transpacific transport of benzo[a]pyrene emitted from Asia[J]. atmospheric chemistry and physics,2011.
APA	Zhang, Y.,Tao, S.,Ma, J.,&Simonich, S..(2011).Transpacific transport of benzo[a]pyrene emitted from Asia.atmospheric chemistry and physics.
MLA	Zhang, Y.,et al."Transpacific transport of benzo[a]pyrene emitted from Asia".atmospheric chemistry and physics (2011).