http://bolin.su.se/data/oden-ao-2018-aerosol-ucpc-1 Andrea Baccarini, Julia Schmale, Josef Dommen 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 Ultrafine condensation particle counter UCPC Ultrafine particles New particle formation CPC3776 Earth science > Atmosphere Julia Schmale 2020-09-23T10:00:21+00:00 English 1 Raw data were collected at 1 Hz frequency and then averaged for 60 s in order to improve the signal to noise ratio. The datetime is reported in the UTC timezone as yyyy-mm-dd HH:MM:SS. Data are reported as particle number concentration per cubic centimeter. The nominal particle diameter cut-off corresponding to a 50% detection efficiency of the UCPC is reported to be equal to 2.5 nm; we did not characterize the transmission efficiency directly. The instrument was operated in high flow mode (1.5 lpm) to reduce diffusional losses. We used an Hampel type filter to remove outliers and spikes related with short-term instrument malfunctioning (e.g. flow variations). 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 UCPC model 3776 manufactured by TSI was used. A description of the instrument is provided by Kangasluoma et al. (2019). 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 - Josef Dommen: https://orcid.org/0000-0002-0006-0009 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).