http://bolin.su.se/data/oden-ao-2018-mart-aerosol-mole-ratio-1 Jessica A. Mirrielees, Rachel M. Kirpes, Patricia A. Matrai, Kerri A. Pratt Bolin Centre Database 2024 Datafile Atmosphere Aerosols Aerosol chemical properties Marine Sea spray aerosol Sea salt aerosol Electron microscopy CCSEM-EDX Marine aerosol reference tank AO2018 AO18 MOCCHA Icebreaker Oden Earth science > Atmosphere > Aerosols > Aerosol particle properties Jessica Mirrielees 2024-06-05T05:22:54+00:00 English 1 Data description: The data are provided in one comma-separated values (csv) file (~2KB). File structure (columns) and contents: 1. Name of experiment (description of water sampling location) 2. Date, format DD/MM/YYYY 3. Time (when surface water was sampled) in UTC, format HH:MM 4. Latitude (water sampling location) 5. Longitude (water sampling location) 6. Mean C/Na mole ratio determined for submicron sea salt particles 7. ±95% CI of l/Na mole ratio determined for submicron sea salt particles 8. Mean Cl/Na mole ratio determined for submicron sea salt particles 9. ±95% CI of Cl/Na mole ratio determined for submicron sea salt particles 10. Mean S/Na mole ratio determined for submicron sea salt particles 11. ±95% CI of S/Na mole ratio determined for submicron sea salt particles 12. Mean N/Na mole ratio determined for submicron sea salt particles 13. ±95% CI of N/Na mole ratio determined for submicron sea salt particles 14. Mean Mg/Na mole ratio determined for submicron sea salt particles 15. ±95% CI of Mg/Na mole ratio determined for submicron sea salt particles 16. Mean Ca/Na mole ratio determined for submicron sea salt particles 17. ±95% CI of Ca/Na mole ratio determined for submicron sea salt particles 18. Mean C/Na mole ratio determined for supermicron sea salt particles 19. ±95% CI of l/Na mole ratio determined for supermicron sea salt particles 20. Mean Cl/Na mole ratio determined for supermicron sea salt particles 21. ±95% CI of Cl/Na mole ratio determined for supermicron sea salt particles 22. Mean S/Na mole ratio determined for supermicron sea salt particles 23. ±95% CI of S/Na mole ratio determined for supermicron sea salt particles 24. Mean N/Na mole ratio determined for supermicron sea salt particles 25. ±95% CI of N/Na mole ratio determined for supermicron sea salt particles 26. Mean Mg/Na mole ratio determined for supermicron sea salt particles 27. ±95% CI of Mg/Na mole ratio determined for supermicron sea salt particles 28. Mean Ca/Na mole ratio determined for supermicron sea salt particles 29. ±95% CI of Ca/Na mole ratio determined for supermicron sea salt particles Aerosol particles were sampled from the MART using a 10-stage rotating micro-orifice uniform deposit impactor (MOUDI, model 120R, MSP Corp.) at a flow rate of 3.5 LPM. An additional 26.5 LPM of particle-free air (filtered with a 1.2 µm pore size HEPA capsule, Pall Life Sciences) resulted in a total flow rate of 30 LPM to the MOUDI. The MOUDI collected particles on transmission electron microscopy (TEM) grids, silicon, and quartz (Ted Pella, Inc) on four stages (< 0.056 µm, 0.1-0.18 µm, 0.32-0.56 µm, and 1.0-1.8 µm aerodynamic diameter) for subsequent offline single-particle analysis. Following particle collection, the substrates were stored in the dark at room temperature (Laskina et al., 2015). Sample analysis using computer-controlled scanning electron microscopy with energy-dispersive X-ray spectroscopy (CCSEM-EDX) was performed at the Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility located at the Pacific Northwest National Laboratory (PNNL) and sponsored by the Office of Biological and Environmental Research of the U.S. Department of Energy. CCSEM-EDX was used to analyze individual particles collected on silicon from the MOUDI stages corresponding with the aerodynamic diameter ranges 0.1-0.18 µm, 0.32-0.56 µm, and 1.0-1.8 µm. Approximately 1500 individual particles were analyzed per silicon substrate (12,674 total particles from the MIZ, NP, IF1-4, IF+A, OP, and MP MART experiments). An FEI Quanta environmental scanning electron microscope (SEM) with a field emission gun operating at an accelerating voltage of 20 kV and beam current 0.48 nA was used for the CCSEM-EDX analysis. An Everhart-Thornley detector was used for SEM images and CCSEM-EDX for particles collected on silicon substrates. An EDX spectrometer (EDAX, Inc.) was used to collect X-ray spectra and quantify the relative atomic abundance of the elements C, N, O, Na, Mg, Al, P, S, Cl, K, Ca, Ti, V, Fe, Ni, and Zn for individual particles collected on silicon substrates. 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/oden-ao-2018-navigation-1) data set. The marine aerosol reference tank experiments were carried out during the Arctic Ocean 2018 expedition on board the Swedish icebreaker Oden, which was organized by the [Swedish Polar Research Secretariat](https://polarforskningsportalen.se/en/arctic/expeditions/arctic-ocean-2018). A portion of this research was performed on a project award 51363 from the Environmental Molecular Sciences Laboratory, a DOE Office of Science User Facility sponsored by the Biological and Environmental Research program under Contract No. DE-AC05-76RL01830.