This dataset contains raw particle number concentration data measured during the year-long MOSAiC expedition from October 2019 to September 2020. The measurement was performed in the Swiss aerosol container on the D-deck of Research Vessel Polarstern using a whole air inlet with an upper cut-off of 40 µm (called also total inlet). Data were collected by a Condensation Particle Counter (CPC) model 3776 (TSI Inc.) in 10 s time resolution with a lower cut-off diameter of 2.5 nm. More detailed information about its position and the measurement setup can be found in Beck et al. (2022).

We encourage data users to refer to Heutte et al. (Submitted) for a more detailed description of the data acquisition, data processing and corrections applied.We thank the Laboratory for Atmospheric Chemistry at the Paul Scherrer Institute for providing the instrument and expertise.