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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 112,
D10313,
doi:10.1029/2006JD008132,
2007
Impacts of enhanced biomass burning in the boreal forests in 1998 on tropospheric chemistry and the sensitivity of model results
to the injection height of emissions
Fok-Yan T. Leung
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
Jennifer A. Logan
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
Rokjin Park
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
Edward Hyer
Naval Research Laboratory, Monterey, California, USA
Eric Kasischke
Department of Geography, University of Maryland, College Park, Maryland, USA
David Streets
Argonne National Laboratory, Argonne, Illinois, USA
Leonid Yurganov
Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, Maryland, USA
Abstract
Carbon monoxide reached record high levels in the northern extratropics in the late summer and fall of 1998 as a result of
anomalously large boreal fires in eastern Russia and North America. We investigated the effects of these fires on CO and tropospheric
oxidants using a global chemical transport model (GEOS-Chem) and two independently derived inventories for the fire emissions
that differ by a factor of two. We find that it is essential to use both surface and column observations of CO to constrain
the magnitude of the fire emissions and their injection altitude. Our results show that the larger of the two inventories
appears more reliable and that about half of the emissions were injected above the boundary layer. The boreal fire emissions
cause a much larger enhancement in ozone when about half the emissions are released above the boundary layer than when they
are released exclusively in the boundary layer, as a consequence of the role of PAN as a source of NOx as air descends in regions far from the fires.
Received 10
October
2006;
accepted 28
February
2007;
published 26
May
2007.
Keywords: carbon monoxide;
boreal forest fires;
biomass burning.
Index Terms: 0368 Atmospheric Composition and Structure: Troposphere: constituent transport and chemistry; 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 0322 Atmospheric Composition and Structure: Constituent sources and sinks.
Read Full Article (file size: 679362 bytes) Cited by
Citation: Leung, F.-Y. T., J. A. Logan, R. Park, E. Hyer, E. Kasischke, D. Streets, and L. Yurganov
(2007),
Impacts of enhanced biomass burning in the boreal forests in 1998 on tropospheric chemistry and the sensitivity of model results
to the injection height of emissions,
J. Geophys. Res.,
112,
D10313,
doi:10.1029/2006JD008132.
Copyright 2007 by the American Geophysical Union.
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