Arctic stratospheric ozone varies greatly year-to-year and season-to-season as it depends on stratospheric dynamics and concentrations of other highly variable trace gases. One of these trace gases is NO2, which is involved in catalytic ozone depletion cycles in the upper stratosphere but can prevent spring-time ozone depletion in the lower stratosphere. NO2 has a short lifetime in the stratosphere, so concentrations depend strongly on available sunlight, which varies greatly throughout the year in the Arctic. We will investigate the variability of Arctic ozone, NO2 and related constituents through the sunlit parts of the International Polar Year with measurements taken at the Polar Environment Atmospheric Research Laboratory (PEARL) in Eureka, Nunavut, Canada (80oN, 86oW). We will compare measurements from three ground-based UV-visible spectrometers and a Bruker 125HR Fourier transform infrared spectrometer with ACE and OSIRIS satellite measurements. Furthermore, we will discuss the seasonal, day-to-day, and diurnal variations of these species and will relate these measurements to available sunlight and dynamical conditions above Eureka.
