Data Set for the 2019-2020 summer campaign: Summer variability of the atmospheric NO2:NO ratio at Dome C, on the East Antarctic Plateau

Atmospheric abundances of Nitrogen dioxide (NO2), Nitrogen oxide (NOx), Nitric oxide (NO) and Ozone (O3) have been measured at Antarctic station Dome C (-75.10 lat., 123.33 long., 3233 m a.s.l). They have been retrieved from direct and in-situ atmospheric measurements using newly developed optical instruments based on absorption spectroscopy (incoherent broadband cavity enhanced absorption spectroscopy or IBBCEAS). These instruments directly measure NO2 with a detection limit of 30 pptv (parts per trillion by volume or 1E-12 mol/mol) (3σ). We performed two sets of measurements in December 2019 (4th to 9th) and January 2020 (16th to 25th) to capture the early and late photolytic season, respectively. The dataset also contains photolysis rate coefficients of Nitrogen dioxide and Ozone, and the Ozone production rate.