Antarctic ozone hole modifies iodine geochemistry on the Antarctic Plateau

Andrea Spolaor (), François Burgay, Rafael P. Fernandez, Clara Turetta, Carlos A. Cuevas, Kitae Kim, Douglas E. Kinnison, Jean-François Lamarque, Fabrizio Blasi, Elena Barbaro, Juan Pablo Corella, Paul Vallelonga, Massimo Frezzotti, Carlo Barbante and Alfonso Saiz-Lopez ()
Additional contact information
Andrea Spolaor: CNR-ISP, Campus Scientifico Via Torino 155, Mestre
François Burgay: Informatics and Statistics, University Ca’Foscari of Venice, via Torino
Rafael P. Fernandez: National Research Council (ICB-CONICET), FCEN-UNCuyo
Clara Turetta: CNR-ISP, Campus Scientifico Via Torino 155, Mestre
Carlos A. Cuevas: Institute of Physical Chemistry Rocasolano, CSIC
Kitae Kim: Korea Polar Research Institute
Douglas E. Kinnison: National Center for Atmospheric Research
Jean-François Lamarque: National Center for Atmospheric Research
Fabrizio Blasi: CNR-ISP, Campus Scientifico Via Torino 155, Mestre
Elena Barbaro: CNR-ISP, Campus Scientifico Via Torino 155, Mestre
Juan Pablo Corella: Institute of Physical Chemistry Rocasolano, CSIC
Paul Vallelonga: University of Copenhagen, Tagensvej 16
Massimo Frezzotti: University of Roma Tre, Largo S. Leonardo Murialdo, 1
Carlo Barbante: CNR-ISP, Campus Scientifico Via Torino 155, Mestre
Alfonso Saiz-Lopez: Institute of Physical Chemistry Rocasolano, CSIC

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Polar stratospheric ozone has decreased since the 1970s due to anthropogenic emissions of chlorofluorocarbons and halons, resulting in the formation of an ozone hole over Antarctica. The effects of the ozone hole and the associated increase in incoming UV radiation on terrestrial and marine ecosystems are well established; however, the impact on geochemical cycles of ice photoactive elements, such as iodine, remains mostly unexplored. Here, we present the first iodine record from the inner Antarctic Plateau (Dome C) that covers approximately the last 212 years (1800-2012 CE). Our results show that the iodine concentration in ice remained constant during the pre-ozone hole period (1800-1974 CE) but has declined twofold since the onset of the ozone hole era (~1975 CE), closely tracking the total ozone evolution over Antarctica. Based on ice core observations, laboratory measurements and chemistry-climate model simulations, we propose that the iodine decrease since ~1975 is caused by enhanced iodine re-emission from snowpack due to the ozone hole-driven increase in UV radiation reaching the Antarctic Plateau. These findings suggest the potential for ice core iodine records from the inner Antarctic Plateau to be as an archive for past stratospheric ozone trends.

Date: 2021
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DOI: 10.1038/s41467-021-26109-x

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