Export of Asian pollution during two cold front episodes of the TRACE-P experiment - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2004

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

Résumé

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.
Fichier principal
Vignette du fichier
Journal of Geophysical Research Atmospheres - 2004 - Mari - Export of Asian pollution during two cold front episodes of.pdf (2.09 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-00136351 , version 1 (25-06-2022)

Licence

Paternité

Identifiants

Citer

C. Mari, M. J. Evans, P.-I. Palmer, D. J. Jacob, G. W. Sachse. Export of Asian pollution during two cold front episodes of the TRACE-P experiment. Journal of Geophysical Research: Atmospheres, 2004, 109, pp.D15817. ⟨10.1029/2003jd004307⟩. ⟨hal-00136351⟩
124 Consultations
6 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More