Abstract
Atmospheric methane, CO and the gaseous OH radical are interdependent: if CH4, CO or OH is perturbed, background concentrations of the other two constituents are affected. Perturbations to OH alter photo-oxidation rates of numerous natural and anthropogenic trace gases and affect lifetimes of those species that pass from the Earth's surface to the free troposphere and stratosphere. It is now known that global atmospheric methane concentrations are increasing1–6; less definite data suggest that carbon monoxide is also increasing1,7–9. Even before the measurements of refs 1–9 were made, modelling studies of CH4-CO-OH coupling had led to predictions10–12 of future temporal increases of CH4 and CO. Here we look backwards in time, using a photochemical model to simulate the trace-gas composition of the unpolluted troposphere at the start of the industrial era (taken as 1860), and at intervals up to 1985. We find that the OH concentration in the background troposphere has decreased significantly and O3 has increased due to increases of CH4 and CO; calculated changes depend on temporal trends of NOx (NOx = NO + NO2), for which no historical data are available. The calculations allow recent trace-gas trends affecting background chemistry and climate to be viewed in a longer-term context.
Similar content being viewed by others
References
Graedel, T. E. & McRae, J. E. Geophys. Res. Lett. 7, 977–979 (1980).
Rasmussen, R. A. & Khalil, M. A. K. J. geophys. Res. 86, 9826–9832 (1981).
Blake, D. R. et al. Geophys. Res. Lett. 9, 477–480 (1982).
Rasmussen, R. A. & Khalil, M. A. K. J. geophys. Res. 89, 11599–11605 (1984).
Ehhalt, D. H., Zander, R. J. & Lamontagne, R. A. J. geophys. Res. 88, 8442–8446 (1983).
Rinsland, C. P., Levine, J. S. & Miles, T. Nature 318, 245–249 (1985).
Seiler, W., Giehl, H., Brunke, E. & Halliday, E. Tellus 36B, 219–231 (1984).
Khalil, M. A. K. & Rasmussen, R. A. Science 224, 54–56 (1984).
Rinsland, C. P. & Levine, J. S. Nature 318, 250–254 (1985).
Chameides, W. L., Liu, S. C. & Cicerone, R. J. J. geophys. Res. 82, 1795–1798 (1977).
Sze, N. D. Science 195, 673–674 (1977).
Hameed, S., Pinto, J. P. & Stewart, R. W. J. geophys. Res. 84, 763–768 (1979).
Khalil, M. A. K. & Rasmussen, R. A. Atmos. Envir. 19, 397–407 (1985).
Stauffer, B., Fischer, G., Neftel, A. & Oeschger, H. Science 229, 1386–1388 (1985).
Craig, H. & Chou, C. C. Geophys. Res. Lett. 9, 1221–1224 (1982).
Seiler, W. Tellus 26, 116–135 (1974).
Logan, J. A., Prather, M. J., Wofsy, S. C. & McElroy, M. B. J. geophys. Res. 86, 7210–7254 (1981).
Keeling, C. D. Tellus 25, 174–198 (1973).
Thompson, A. M. & Cicerone, R. J. J. geophys. Res. (submitted); 87, 8811–8826 (1982).
Levy II, H., Mahlman, J. D. & Moxim, W. J. Geophys. Res. Lett. 7, 441–444 (1980).
Liu, S. C., McFarland, M., Kley, D. & Zafiriou, O. C. J. geophys. Res. 88, 1360–1368 (1983).
Levine, J. S., Rinsland, C. P. & Tennille, G. M. Nature 318, 254–257 (1985).
Fishman, J., Solomon, S. & Crützen, P. J. Tellus 31, 432–446 (1979).
Fishman, J. & Seiler, W. J. geophys. Res. 88, 3662–3670 (1983).
Chameides, W. L. & Walker, J. C. G. J. geophys. Res. 78, 8751–8760 (1973).
Bojkov, R. Spec. Envir. Rep. no. 16 (World Meteorological Organization, Geneva, 1984).
Logan, J. A. J. geophys. Res. 90, 10463–10482 (1985).
Fishman, J., Ramanathan, V., Crutzen, P. J. & Liu, S. C. Nature 282, 818–820 (1979).
Ramanathan, V., Cicerone, R. J., Singh, H. B. & Kiehl, J. T. J. geophys. Res. 90, 5547–5566 (1985).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Thompson, A., Cicerone, R. Atmospheric CH4, CO and OH from 1860 to 1985. Nature 321, 148–150 (1986). https://doi.org/10.1038/321148a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/321148a0
- Springer Nature Limited
This article is cited by
-
Die belastete Troposphäre
Umweltwissenschaften und Schadstoff-Forschung (1992)
-
A record of the atmospheric methane sink from formaldehyde in polar ice cores
Nature (1991)
-
Carbon monoxide in the Earth's atmosphere: indications of a global increase
Nature (1988)