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HERO ID
664506
Reference Type
Journal Article
Title
Effect of bromine chemistry on natural tropospheric ozone: Improved simulation of observations from the turn of the 20th century
Author(s)
Parrella, JP; Evans, MJ; Jacob, DJ; Liang, Q; Mickley, LJ; Miller, B; Pyle, JA; Yang, X
Year
In Press
Is Peer Reviewed?
1
Journal
Nature
ISSN:
0028-0836
EISSN:
1476-4687
URL
http://acmg.seas.harvard.edu/publications/parrella2010.pdf
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Abstract
Ozone is a toxic gas in surface air and a major anthropogenic greenhouse gas in the troposphere. Current models systematically overestimate the low surface ozone concentrations measured in the late 19th and early 20th century1,2,3,4. This suggests that current values of the natural ozone background used as baseline for air quality and climate policy are too high. Here we show that inclusion of tropospheric bromine chemistry in two different global models for the preindustrial atmosphere significantly improves agreement with ozone measurements of a century ago, both in terms of magnitude and seasonal variation. A natural surface ozone background of 13 ± 4 ppb is computed for the US, lower than current estimates and implying a greater margin for ozone reduction by emission controls.
Tags
NAAQS
•
ISA-Ozone (2013 Final Project Page)
Considered
Eco/Welfare
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