Export of Asian pollution during two cold front episodes of the TRACE-P experiment

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Export of Asian pollution during two cold front episodes of the TRACE-P experiment

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Title: Export of Asian pollution during two cold front episodes of the TRACE-P experiment
Author: Mari, C.; Evans, M; Palmer, P; Jacob, Daniel James; Sachse, G

Note: Order does not necessarily reflect citation order of authors.

Citation: Mari, C., M. J. Evans, P. I. Palmer, D. J. Jacob, and G. W. Sachse. 2004. “Export of Asian Pollution During Two Cold Front Episodes of the TRACE-P Experiment.” Journal of Geophysical Research 109 (D15). doi:10.1029/2003jd004307.
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Abstract: Two cold front episodes were sampled during the two flights out of Yokota, Japan, during the Transport and Chemical Evolution Over the Pacific (TRACE-P) experiment during March 2001. The data from these two flights are examined using a mesoscale three-dimensional model. We show how these cyclonic systems have impacted the export of pollution out of the Asian continent. We contrast the relative role of convection and ascent in the warm conveyor belts associated with the cyclone during these two episodes. Although the necessary meteorological conditions for an efficient export of pollution are met during flight 13 (i.e., the occurrences of the warm conveyor belt near the source regions), no significant pollution is simulated in the mid-Pacific in the lower and middle troposphere. The efficient ventilation of the WCB by convection near the coast, the advection by the anticyclonical flow above 700 hPa, and the downward motion associated with the Pacific high in the remote ocean significantly prevent any long-range transport of undiluted pollution in the WCB. During flight 15 the conveyor belts have already moved to the remote ocean. The polluted plume is split by the rising air in the warm conveyor belt which transports CO-poor air northward and by the oceanic convection which transports clean air masses upward. These mechanisms lead to the dilution of Asian pollution in WCB en route to North America and add to the episodic nature of the Asian outflow by fragmenting the pollution plume.
Published Version: doi:10.1029/2003JD004307
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:14121854
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