Holocene atmospheric iodine evolution over the North Atlantic
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Published:2019-12-18
Issue:6
Volume:15
Page:2019-2030
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Corella Juan Pablo, Maffezzoli Niccolo, Cuevas Carlos Alberto, Vallelonga PaulORCID, Spolaor AndreaORCID, Cozzi Giulio, Müller JulianeORCID, Vinther Bo, Barbante CarloORCID, Kjær Helle Astrid, Edwards RossORCID, Saiz-Lopez AlfonsoORCID
Abstract
Abstract. Atmospheric iodine chemistry has a large influence on the
oxidizing capacity and associated radiative impacts in the troposphere.
However, information on the evolution of past 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 geochemical measurements from coastal eastern
Greenland ReCAP (REnland ice CAP project) ice core, we report the first
record of atmospheric iodine variability in the North Atlantic during the
Holocene (i.e., the last 11 700 years). Surprisingly, our results reveal that
the highest iodine concentrations in the record were found during the
Holocene Thermal Maximum (HTM; ∼ 11 500–5500 years before-present). These high iodine levels could be driven by marine primary
productivity resulting in an Early Holocene “biological iodine explosion”.
The high and stable iodine levels during this past warm period are a useful
observational constraint on projections of future changes in Arctic
atmospheric composition and climate resulting from global warming.
Funder
European Research Council
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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