Data for Widespread detection of chlorine oxyacids in the Arctic atmosphere: Villum Research Station and Ny-Ålesund observations

The data includes: 1) Data for the time series of HClO3 and HClO4 together with relevant data from the Villum Research Station observations. 2) Data for the time series of HClO3 from Ny-Ålesund observation. 3) Data of the estimated cross-section and photolysis rate of HClO3 and HClO4. Data are also available from the corresponding authors upon request.