Halocarbon emissions from the United States and Mexico and their global warming potential.
Environ Sci Technol
; 43(4): 1055-60, 2009 Feb 15.
Article
en En
| MEDLINE
| ID: mdl-19320157
ABSTRACT
We use recent aircraft measurements of a comprehensive suite of anthropogenic halocarbons, carbon monoxide (CO), and related tracers to place new constraints on North American halocarbon emissions and quantify their global warming potential. Using a chemical transport model (GEOS-Chem) we find that the ensemble of observations are consistent with our prior best estimate of the U.S. anthropogenic CO source, but suggest a 30% underestimate of Mexican emissions. We develop an optimized CO emission inventory on this basis and quantify halocarbon emissions from their measured enhancements relative to CO. Emissions continue for many compounds restricted under the Montreal Protocol, and we show that halocarbons make up an important fraction of the total greenhouse gas source for both countries our best estimate is 9% (uncertainty range 6-12%) and 32% (21-52%) of equivalent CO2 emissions for the U.S. and Mexico, respectively, on a 20 year time scale. Performance of bottom-up emission inventories is variable, with underestimates for some compounds and overestimates for others. Ongoing methylchloroform emissions are significant in the U.S. (2.8 Gg/y in 2004-2006), in contrast to bottom-up estimates (< 0.05 Gg), with implications for tropospheric OH calculations. Mexican methylchloroform emissions are minor.
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Bases de datos:
MEDLINE
Asunto principal:
Efecto Invernadero
/
Contaminantes Atmosféricos
/
Hidrocarburos Halogenados
Tipo de estudio:
Prognostic_studies
País/Región como asunto:
Mexico
Idioma:
En
Revista:
Environ Sci Technol
Año:
2009
Tipo del documento:
Article
País de afiliación:
Estados Unidos