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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Jun 2019

Research article | 13 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Holocene atmospheric iodine evolution over the North Atlantic

Juan Pablo Corella1, Niccolo Maffezzoli2,3, Carlos Alberto Cuevas1, Paul Vallelonga2, Andrea Spolaor3, Giulio Cozzi3, Juliane Müller4, Bo Vinther2, Carlo Barbante3,5, Helle Astrid Kjaer2, Ross Edwards6,7, and Alfonso Saiz-Lopez1 Juan Pablo Corella et al.
  • 1Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC,Serrano 119, 28006 Madrid, Spain
  • 2Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, Copenhagen Ø 2100, Denmark
  • 3Institute for the Dynamics of Environmental Processes, IDPA-CNR, Via Torino 155, 30170 Mestre, Italy
  • 4Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany
  • 5Ca ́Foscari University of Venice, Department of Environmental Sciences, Informatics and Statistics, Via Torino 155, 30170 Venice Mestre, Italy
  • 6Physics and Astronomy, Curtin University of Technology, Kent St, Bentley WA 6102, Australia
  • 7Department of Civil and Environmental Engineering, UW-Madison, Madison, WI 53706, USA

Abstract. Atmospheric iodine chemistry has a large influence on oxidizing capacity and associated radiative impacts in the troposphere. However, information on the evolution of atmospheric iodine levels is restricted to the Industrial Period while its long-term natural variability remains unknown. The current levels of iodine in the atmosphere are controlled by anthropogenic ozone deposition to the ocean surface. Here, using high-resolution ice core measurements from coastal eastern Greenland (ReCAP ice core), we report the first record of atmospheric iodine variability during the Holocene (last 11,700 years). Surprisingly, our results reveal that the highest iodine concentrations in the record, found during the Holocene Thermal Maximum (~ 1,500-–,500 years before -present). These high iodine levels could be driven by ocean primary productivity resulting in an Early Holocene “Biological Iodine Explosion”. The iodine trend during this past warm period is a useful observational constraint on projections of future changes in Arctic atmospheric composition and climate resulting from global warming.

Juan Pablo Corella et al.
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Status: open (until 08 Aug 2019)
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Juan Pablo Corella et al.
Juan Pablo Corella et al.
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Publications Copernicus
Short summary
This study provides the first reconstruction of atmospheric iodine levels in the Arctic during the last 11,700 years from an ice core record in coastal Greenland. Dramatic shifts in iodine levels variability coincide with abrupt climatic transitions in the North Atlantic. Since atmospheric iodine levels have significant environmental and climatic implications, this study may serve as a past analogue to predict future changes in arctic climate in response to Global Warming.
This study provides the first reconstruction of atmospheric iodine levels in the Arctic during...