http://bolin.su.se/data/oden-ao-2018-aerosol-smps-1 Andrea Baccarini, Julia Schmale Bolin Centre Database 2020 Datafile Atmosphere Aerosols Aerosol physical properties Aerosols AO2018 Arctic Ocean Icebreaker Oden Atmosphere 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 Scanning mobility particle sizer SMPS Aerosol size distribution Earth science > Atmosphere Julia Schmale 2020-09-23T10:00:13+00:00 English 1 The instrument time resolution is 3 minutes that corresponds to the scan time from the smallest (18 nm) to the largest (660 nm) particle diameter. The datetime is reported in the UTC timezone as yyyy-mm-dd HH:MM:SS. Data are reported as dN/dlog(Dp), where dN is the particle number concentration per cubic centimeter per measured size bin, normalized over the logarithm of the bin width. The bin width is defined as the distance between two diameters. They are spaced equally in log-space with 64 bins per decade. The instrument was sampling behind two different inlets: a whole-air inlets sampling the entire aerosol population and an interstitial inlet sampling only particles smaller than 1 micrometer. Therefore, during a fog event the interstitial inlet would only sample the non-activated fraction of the aerosol population because fog droplets are larger than the inlet cut-off. The instrument was switching between the two inlets every 15 minutes, each measurement right before and after the inlet switch was removed to avoid potential issues with pressure drops in the inlet line. The “Inlet status” column indicates behind which inlet the instrument was sampling: 1 indicates the total inlet and 2 the interstitial inlet. The last column in the dataset is a flag to separate between clean data and data that are potentially influenced by the ship exhaust: 1 indicates clean data and 2 contaminated data. The numeric column header corresponds to the starting size of each diameter bin. The SMPS diameter range used for the aerosol size selection was not kept constant during the entire measurement period. However, in order to keep data consistent, the diameter size bins were resampled on a common grid. The presence of missing data for some diameter bins indicates that the SMPS measurements did not cover that specific size range at that time. A description of the SMPS instrument is provided by Wang et al. (1989). 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](https://bolin.su.se/data/ao2018-navigation) data set. The data creator ORCIDs are the following: - Andrea Baccarini: https://orcid.org/0000-0003-4614-247X - Julia Schmale: https://orcid.org/0000-0002-1048-7962 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](https://polarforskningsportalen.se/en/arctic/expeditions/arctic-ocean-2018). 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](https://www.aces.su.se/research/projects/microbiology-ocean-cloud-coupling-in-the-high-arctic-moccha/) with updates).