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Significance We report atmospheric bromine atom measurements, which quantitatively explain the removal of the ozone and mercury from the near-surface Arctic troposphere. Bromine atoms are proposed to dominate mercury oxidation and its deposition into the ecosystem on the global scale. Therefore, the analytical capability of in situ bromine atom measurements and the results herein have broad significance beyond the Arctic, particularly in areas of abundant bromine chemistry, including the Antarctic near-surface troposphere, volcanic plumes, above saline lakes, and especially the tropical upper troposphere, where bromine atoms are predicted to exist in high relative abundance.

Direct detection of atmospheric atomic bromine leading to mercury and ozone depletion