New Observational Constraints for Atmospheric Hydroxyl on Global and Hemispheric Scales

Autor:	James H. Butler, C. M. Spivakovsky, Stephen A. Montzka, James W. Elkins, L. T. Lock, D. J. Mondeel
Rok vydání:	2000
Předmět:	Atmosphere chemistry.chemical_compound Multidisciplinary chemistry Intertropical Convergence Zone Tropics Environmental science Hydroxyl radical Atmospheric sciences
Zdroj:	Science. 288:500-503
ISSN:	1095-9203 0036-8075
DOI:	10.1126/science.288.5465.500
Popis:	Dramatic declines in emissions of methyl chloroform (1,1,1-trichloroethane) resulting from the Montreal Protocol provide an unprecedented opportunity to improve our understanding of the oxidizing power of Earth's atmosphere. Atmospheric observations of this industrial gas during the late 1990s yield new insights into the global burden and distribution of the hydroxyl radical. Our results set firm upper limits on the global and Southern Hemispheric lifetimes of methyl chloroform and confirm the predominance of hydroxyl in the tropics. Our analysis suggests a global lifetime for methyl chloroform of 5.2 (+0.2, −0.3) years, a Southern Hemispheric lifetime of 4.9 (+0.2, −0.3) years, and mean annual concentrations of OH that are 15 ± 10% higher south of the intertropical convergence zone than those north of this natural mixing boundary between the hemispheres.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37435092c42880f924c4927bcad4a97e https://doi.org/10.1126/science.288.5465.500 Zobrazit plný text záznamu Plný text ve formátu PDF