1] Reactive nitrogen species HNO 3 , ClONO 2 , NO, NO 2 , and N 2 O 5 were retrieved from high resolution atmospheric limb emission spectra measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board the European Environmental Satellite (ENVISAT) during the split of the southern polar vortex in September/October 2002. The chemical and transport processes determining the NO y deficit and partitioning are investigated here. Most of the available NO y in the polar vortex was in the…
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