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Transpacific transport of benzo[a]pyrene emitted from Asia

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dc.creator Zhang, Y.
dc.creator Tao, S.
dc.creator Ma, J.
dc.creator Simonich, S.
dc.date.accessioned 2012-07-23T21:04:16Z
dc.date.available 2012-07-23T21:04:16Z
dc.date.issued 2011
dc.identifier.citation Zhang, Y., Tao, S., Ma, J., & Simonich, S. (2011). Transpacific transport of benzo[a]pyrene emitted from asia. Atmospheric Chemistry and Physics, 11(23), 11993-12006. doi: 10.5194/acp-11-11993-2011 en_US
dc.identifier.uri http://hdl.handle.net/1957/31445
dc.description This is the publisher’s final pdf. The published article is copyrighted by European Geosciences Union and can be found at: http://www.egu.eu/. en_US
dc.description.abstract 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. en_US
dc.description.sponsorship The funding for this study was provided by the National Scientific Foundation of China (40710019001, 40730737), The Ministry of Science and Technology of China (2007CB407301) and the National Institute of Health of the US (grant P42 ES016465). en_US
dc.language.iso en_US en_US
dc.publisher European Geosciences Union en_US
dc.relation.ispartofseries Atmospheric Chemistry and Physics en_US
dc.relation.ispartofseries Vol. 11 no. 23 en_US
dc.subject Polycyclic aromatic-hydrocarbons en_US
dc.subject Long-range transport en_US
dc.subject Semivolatile organic-compounds en_US
dc.subject Lung-cancer risk en_US
dc.subject Atmospheric transport en_US
dc.subject Part 2 en_US
dc.subject Season-variations en_US
dc.subject Golbal distribution en_US
dc.subject Emission inventory en_US
dc.subject Winter monsoon en_US
dc.title Transpacific transport of benzo[a]pyrene emitted from Asia en_US
dc.type Article en_US
dc.identifier.doi 10.5194/acp-11-11993-2011

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