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Stratospheric and total columns of Arctic O3 (63-90 degrees N) in late March 2011 averaged 320 and 349 DU, respectively, 50-100 DU lower than any of the previous 6 years. In this paper the authors used Aura Microwave Limb Sounder (MLS) O3 observations to quantify the roles of chemistry and transport and find there are two major reasons for low O3 in March 2011: heterogeneous chemical loss and a late final warming that delayed the resupply of O3 until April. [Source: Journal of Geophysical Research: Atmospheres]
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