How sensitive is tropospheric oxidation to anthropogenic emissions?
Article first published online: 18 NOV 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 22, November 2008
How to Cite
2008), How sensitive is tropospheric oxidation to anthropogenic emissions? Geophys. Res. Lett., 35, L22802, doi:10.1029/2008GL035718., and (
- Issue published online: 18 NOV 2008
- Article first published online: 18 NOV 2008
- Manuscript Accepted: 8 OCT 2008
- Manuscript Revised: 3 OCT 2008
- Manuscript Received: 15 AUG 2008
- tropospheric oxidation;
- ozone production;
- hydroxyl radicals
 We use a global chemistry transport model to explore how changes in anthropogenic emissions alter ozone production and tropospheric oxidizing capacity over decadal (1990–2010) and centennial timescales (1900–2100). We find that the spatial extent of O3 production and loss in the troposphere changes very little despite large projected increases in precursor emissions. While tropospheric OH shows a long-term decrease of only 20% between 1900 and 2100, there are widespread changes in distribution which alter regional oxidation capacity substantially. We show that the remote marine boundary layer remains an important net sink of O3, as greater production related to increased continental NOx emissions is outweighed by greater O3 destruction. The critical NOx level required to support net O3 production doubles between 1900 and 2100, from 28 to 55 pptv on average, preventing any large-scale shift in production regime.