We examine the variability of ClO in the Arctic upper troposphere and lowermost stratosphere (UTLS) during the winter of 1999-2000. Data are binned relative to NO y , a species that is a proxy for photochemical age and a photochemical source of NO x . Enhancements in the [ClO]/[Cl y ] ratio relative to values expected from gas-phase chemistry alone were observed throughout the region and were largest in the coldest sampled regions, where T < 208 K. At low NO y values, where particles containing NO y and w…
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