In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 112, No. D10 ( 2007-05-27)
Abstract:
Intercontinental Transport of Ozone and Precursors (ITOP) (part of International Consortium for Atmospheric Research on Transport and Transformation (ICARTT)) was an intense research effort to measure long‐range transport of pollution across the North Atlantic and its impact on O 3 production. During the aircraft campaign plumes were encountered containing large concentrations of CO plus other tracers and aerosols from forest fires in Alaska and Canada. A chemical transport model, p‐TOMCAT, and new biomass burning emissions inventories are used to study the emissions long‐range transport and their impact on the troposphere O 3 budget. The fire plume structure is modeled well over long distances until it encounters convection over Europe. The CO values within the simulated plumes closely match aircraft measurements near North America and over the Atlantic and have good agreement with MOPITT CO data. O 3 and NO x values were initially too great in the model plumes. However, by including additional vertical mixing of O 3 above the fires, and using a lower NO 2 /CO emission ratio (0.008) for boreal fires, O 3 concentrations are reduced closer to aircraft measurements, with NO 2 closer to SCIAMACHY data. Too little PAN is produced within the simulated plumes, and our VOC scheme's simplicity may be another reason for O 3 and NO x model‐data discrepancies. In the p‐TOMCAT simulations the fire emissions lead to increased tropospheric O 3 over North America, the north Atlantic and western Europe from photochemical production and transport. The increased O 3 over the Northern Hemisphere in the simulations reaches a peak in July 2004 in the range 2.0 to 6.2 Tg over a baseline of about 150 Tg.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/2006JD007563
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2007
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