I visited Dr. Allan Bertram’s research lab at UBC to measure the freezing temperature of aerosols, from Aug 2nd to 10th. I collected aerosols in six size fractions between <0.49 and 7.0 microns in diameter on board the Amundsen in the Arctic using a cascade impactor fitted to a high volume sampler. The goal of the project was to examine the role of biogenic sulfate on aerosol formation and growth as well as the activation of cloud nuclei to form precipitation during the Arctic summer. We measured total sulfate and the isotopic composition of sulfate aerosols in the isotope lab at U of Calgary and performed apportionment calculations to quantify the amount of biogenic, anthropogenic and sea salt sulfate. Our next step is to identify whether the aerosol sulfate from biogenic or sea salt sources is associated with IN activation. Dr. Bertram’s research focuses on understanding Ice Nucleation mechanisms. I visited Dr. Bertram’s group and lab at UBC to appropriately measure the temperature at which IN form, and now I can apply this to my aerosol samples. These measurements will help identify whether total sulfate or sulfate from a particular size fraction or source is more important for IN properties in the Arctic summer.
I enjoyed the nice weather and my stay in Vancouver, and I would like to thank Allan, Cedric, Pablo, Vicki, and all other people from the Bertram group. Working in their lab and learning more about their work was very interesting for me and I am looking forward to future collaborations.