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Substantial contribution of iodine to Arctic ozone destruction

Nuria Benavent, Anoop S. Mahajan, Qinyi Li, Carlos A. Cuevas, Julia Schmale, Hélène Angot, Tuija Jokinen, Lauriane L. J. Quéléver, Anne-Marlene Blechschmidt, Bianca Zilker, Andreas Richter, Jesús A. Serna, David Garcia-Nieto, Rafael P. Fernandez, Henrik Skov, Adela Dumitrascu, Patric Simões Pereira, Katarina Abrahamsson, Silvia Bucci, Marina Duetsch, Andreas Stohl, Ivo Beck, Tiia Laurila, Byron Blomquist, Dean Howard, Stephen D. Archer, Ludovic Bariteau, Detlev Helmig, Jacques Hueber, Hans-Werner Jacobi, Kevin Posman, Lubna Dada, Kaspar R. Daellenbach and Alfonso Saiz-Lopez.

Nature Geoscience (2022), https://doi.org/10.1038/s41561-022-01018-w, 2022.

Abstract:

Unlike bromine, the effect of iodine chemistry on the Arctic surface ozone budget is poorly constrained. We present ship-based measurements of halogen oxides in the high Arctic boundary layer from the sunlit period of March to October 2020 and show that iodine enhances springtime tropospheric ozone depletion. We find that chemical reactions between iodine and ozone are the second highest contributor to ozone loss over the study period, after ozone photolysis-initiated loss and ahead of bromine.

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