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Title

Injection of iodine to the stratosphere

AuthorsSaiz-Lopez, A. ; Baidar, S.; Cuevas, C.A.; Koenig, T.K.; Fernandez, R.P.; Dix, B.; Kinnison, D.E.; Lamarque, J.-F.; Rodriguez-Lloveras, Xavier; Campos, T.L.; Volkamer, R.
Issue Date2015
PublisherAmerican Geophysical Union
CitationGeophysical Research Letters 42: 6852- 6859 (2015)
Abstract© 2015. American Geophysical Union. All Rights Reserved. We report a new estimation of the injection of iodine into the stratosphere based on novel daytime (solar zenith angle < 45°) aircraft observations in the tropical tropopause layer and a global atmospheric model with the most recent knowledge about iodine photochemistry. The results indicate that significant levels of total reactive iodine (0.25-0.7 parts per trillion by volume), between 2 and 5 times larger than the accepted upper limits, can be injected into the stratosphere via tropical convective outflow. At these iodine levels, modeled iodine catalytic cycles account for up to 30% of the contemporary ozone loss in the tropical lower stratosphere and can exert a stratospheric ozone depletion potential equivalent to, or even larger than, that of very short-lived bromocarbons. Therefore, we suggest that iodine sources and chemistry need to be considered in assessments of the historical and future evolution of the stratospheric ozone layer.
URIhttp://hdl.handle.net/10261/130660
DOI10.1002/2015GL064796
Identifiersdoi: 10.1002/2015GL064796
issn: 1944-8007
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