Contributions to twentieth century total column ozone change from halocarbons, tropospheric ozone precursors, and climate change

Reader, M. C., Plummer, D. A., Scinocca, J. F. and Shepherd, T. G. ORCID: https://orcid.org/0000-0002-6631-9968 (2013) Contributions to twentieth century total column ozone change from halocarbons, tropospheric ozone precursors, and climate change. Geophysical Research Letters, 40 (23). pp. 6276-6281. ISSN 0094-8276 doi: 10.1002/2013GL057776

Abstract/Summary

We investigate ozone changes from preindustrial times to the present using a chemistry-climate model. The influence of changes in physical climate, ozone-depleting substances, N2O, and tropospheric ozone precursors is estimated using equilibrium simulations with these different factors set at either preindustrial or present-day values. When these effects are combined, the entire decrease in total column ozone from preindustrial to present day is very small (–1.8 DU) in the global annual average, though with significant decreases in total column ozone over large parts of the Southern Hemisphere during austral spring and widespread increases in column ozone over the Northern Hemisphere during boreal summer. A significant contribution to the total ozone column change is the increase in lower stratospheric ozone associated with the increase in ozone precursors (5.9 DU). Also noteworthy is the near cancellation of the global average climate change effect on ozone (3.5 DU) by the increase in N2O (–3.9 DU).

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/35574
Identification Number/DOI	10.1002/2013GL057776
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Uncontrolled Keywords	stratospheric ozone; tropospheric ozone; climate change
Publisher	American Geophysical Union
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