Rights statement: Cox, R.A., Bloss, W., Jones, R.L. (1999), OIO and the atmospheric cycle of iodine, Geophysical Research Letters, Volume 26, DOI: 10.1029/1999GL900439. To view the published open abstract, go to http://dx.doi.org and enter the DOI. An edited version of this paper was published by AGU. Copyright (1999) American Geophysical Union.