Abstract
Iodine in the atmosphere can destroy ozone and can also accelerate bromine‐catalyzed ozone depletion. Iodine has been measured in the Antarctic atmosphere at levels that cause significant ozone depletion. Mahajan et al. now report detailed measurements of iodine in the Arctic lower troposphere above Hudson Bay. They observed episodes of elevated levels of iodine monoxide as well as other iodine compounds. They suggest that the iodine monoxide probably originated from organoiodine compounds released from ice and seawater algae in areas of open water surrounded by sea ice in Hudson Bay. The emissions of these iodinated compounds will probably grow if sea ice cover in the Arctic continues to decrease. (Journal of Geophysical Research‐Atmospheres, doi:10.1029/2009JD013665, 2010)
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