Fidas measurements of total aerosol number concentration and number size distributions in summertime in Narsaq, South Greenland during Greenfjord 2023

Abstract and dataset contents: This dataset provides aerosol particle number size distributions (dN/dlogDp) covering optical diameters from 0.191 to 93.057 μm, along with total aerosol number concentrations (cm⁻³), recorded at 30-second resolution. Measurements were conducted using an optical particle counter (Fidas Frog, Palas, Karlsruhe, Germany). Measurements were carried out at the Narsaq International Research Station (NIRS) in southern Greenland (60.9158°N, 46.0533°W, 17 m above sea level) during the Greenfjord campaign in June-August 2023. Metadata is provided in the file ‘metadata_Fidas.doc’, the bin diameters are provided in ‘fidas_bin_boundaries.csv’. Briefly, the dataset named ‘fidas.csv’ includes: Datetime Normalsed number concentration per (dN/dlogDp) Pollution flag to inform data user when short-lived spikes can be found in the data from local anthropogenic pollution Inlet relative humidity (RH) flag to inform the data user when the RH in the inlet system reached over 40 % Funding acknowledgements: This work was supported by funding from the Swiss National Science Foundation grant no. 200021_212101, the Swiss Polar Institute grant no. SPI-FLAG-2021-002 Greenfjord, and the ENAC Flagship 2022 ECO-Plains.