Andrea Baccarini, Julia Schmale Ultrafine particle concentration measured during the Arctic Ocean 2018 expedition Bolin Centre Database 2020 Datafile Atmosphere Aerosols Aerosol physical properties AO2018 Arctic Ocean Icebreaker Oden Arctic Ocean 2018 Atmospheric Science Atmospheric Chemistry Atmospheric Physics Clouds Aerosol Science Microbiology-Ocean-Cloud-Coupling in the High Arctic MOCCHA High Arctic North Pole Aerosol-Cloud-Interaction 2018 Ultrafine particles Aerosol New particle formation Earth science > Atmosphere Julia Schmale 2020-09-23T10:00:25+00:00 English 1.0 The UFP concentration was calculated as the difference between the concentration of particles larger than 2.5 nm (measured with an ultrafine condensation particle counter (UCPC)) and the particle concentration larger than 15 nm (obtained by integration of the particle size distribution measured with a differential mobility particle sizer (DMPS)). The DMPS integrated number concentration was subtracted directly from the number concentration measured with the UCPC after resampling to 10 minute time resolution. For periods where the UCPC was not working properly we used measurements from a particle size magnifier. The time resolution is 10 minutes and the UFP concentration was calculated only for data that were not affected by the ship exhaust. The datetime is reported as UTC in the format yyyy-mm-dd HH:MM:SS. The ship track with latitude and longitude information can be found in the [Navigation, meteorological and surface seawater data from the Arctic Ocean 2018 expedition]( data set. The [UCPC]( and [DMPS]( data can be also be found in the Bolin Centre database. The data creator ORCID are the following: - Andrea Baccarini: - Julia Schmale: - Josef Dommen: Data were collected during the Arctic Ocean 2018 expedition on board the Swedish icebreaker (I/B) Oden, which was organized by the [Swedish Polar Research Secretariat]( The observations were part of the project ‘Aerosol-cloud interactions in the High Arctic’ (PI Paul Zieger, Department of Environmental Science, Stockholm University; see [MOCCHA project website]( with updates).