Scanning Electrical Mobility Spectrometer (SEMS) measurements of aerosol particle number concentration and size distribution in summertime in Narsaq, South Greenland during Greenfjord 2023

Abstract and dataset contents: This dataset contains measurements of aerosol particle number concentrations (cm⁻³) and size distributions (dN/dlogDp) spanning 8 to 1000 nm, obtained using a Scanning Electrical Mobility Spectrometer (SEMS, Brechtel Manufacturing Inc., USA). 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. Full description of the dataset can be found in the metadata_SEMS.doc file. Briefly, the dataset files (Lv2_SEMS.csv; SEMS_bin_diameters.csv) include: Datetime Normalsed number concentration per (dN/dlogDp) SEMS total number concentration Interstitial inlet flag to inform data user when CCN counter was switched from total inlet to PM1 inlet 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 % Bin diameters 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.