期刊
SCIENCE ADVANCES
卷 7, 期 52, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abj6544
关键词
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资金
- U.S. NSF [AGS-1104104, AGS-1620530, AGS-2027252]
- European Research Council Executive Agency under Horizon 2020 Research and Innovation programme [ERC-2016-COG 726349 CLIMAHAL]
Iodine, an atmospheric trace element from oceans, is found to potentially form gas-phase iodine in airborne dust layers, leading to decreased ozone levels. This may result in an 8% regional decrease in O-3 and impact surface air quality.
Iodine is an atmospheric trace element emitted from oceans that efficiently destroys ozone (O-3). Low O-3 in airborne dust layers is frequently observed but poorly understood. We show that dust is a source of gas-phase iodine, indicated by aircraft observations of iodine monoxide (IO) radicals inside lofted dust layers from the Atacama and Sechura Deserts that are up to a factor of 10 enhanced over background. Gas-phase iodine photochemistry, commensurate with observed IO, is needed to explain the low O-3 inside these dust layers (below 15 ppbv; up to 75% depleted). The added dust iodine can explain decreases in O-3 of 8% regionally and affects surface air quality. Our data suggest that iodate reduction to form volatile iodine species is a missing process in the geochemical iodine cycle and presents an unrecognized aeolian source of iodine. Atmospheric iodine has tripled since 1950 and affects ozone layer recovery and particle formation.
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