Rapid increase in atmospheric iodine levels in the North Atlantic since the mid-20th century

Carlos A. Cuevas, Niccolò Maffezzoli, Juan Pablo Corella, Andrea Spolaor, Paul Vallelonga, Helle A. Kjær, Marius Simonsen, Mai Winstrup, Bo Vinther, Christopher Horvat, Rafael P. Fernandez, Douglas Kinnison, Jean-François Lamarque, Carlo Barbante and Alfonso Saiz-Lopez ()
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Carlos A. Cuevas: Institute of Physical Chemistry Rocasolano
Niccolò Maffezzoli: University of Copenhagen, Juliane Maries vej 30
Juan Pablo Corella: Institute of Physical Chemistry Rocasolano
Andrea Spolaor: Informatics and Statistics
Paul Vallelonga: University of Copenhagen, Juliane Maries vej 30
Helle A. Kjær: University of Copenhagen, Juliane Maries vej 30
Marius Simonsen: University of Copenhagen, Juliane Maries vej 30
Mai Winstrup: University of Copenhagen, Juliane Maries vej 30
Bo Vinther: University of Copenhagen, Juliane Maries vej 30
Christopher Horvat: Harvard University
Rafael P. Fernandez: FCEN-UNCuyo, UTN-FRM
Douglas Kinnison: NCAR
Jean-François Lamarque: NCAR
Carlo Barbante: Informatics and Statistics
Alfonso Saiz-Lopez: Institute of Physical Chemistry Rocasolano

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Atmospheric iodine causes tropospheric ozone depletion and aerosol formation, both of which have significant climate impacts, and is an essential dietary element for humans. However, the evolution of atmospheric iodine levels at decadal and centennial scales is unknown. Here, we report iodine concentrations in the RECAP ice-core (coastal East Greenland) to investigate how atmospheric iodine levels in the North Atlantic have evolved over the past 260 years (1750–2011), this being the longest record of atmospheric iodine in the Northern Hemisphere. The levels of iodine tripled from 1950 to 2010. Our results suggest that this increase is driven by anthropogenic ozone pollution and enhanced sub-ice phytoplankton production associated with the recent thinning of Arctic sea ice. Increasing atmospheric iodine has accelerated ozone loss and has considerably enhanced iodine transport and deposition to the Northern Hemisphere continents. Future climate and anthropogenic forcing may continue to amplify oceanic iodine emissions with potentially significant health and environmental impacts at global scale.

Date: 2018
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DOI: 10.1038/s41467-018-03756-1

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