Ice nucleating particles in the Canadian Arctic ...

• Main Author: Irish, Victoria Emilie
• Format: Text
• Language: English
• Published: University of British Columbia 2018
• Subjects: Arctic
• Online Access: https://dx.doi.org/10.14288/1.0374169; https://doi.library.ubc.ca/10.14288/1.0374169

Ice nucleating particles (INPs) in the Arctic can influence climate and precipitation in the region; yet our understanding of the concentrations and sources of INPs in this region remain uncertain. The following dissertation investigates 1) the properties and concentrations of INPs in the sea surface microlayer and bulk seawater samples collected in the Canadian Arctic, and 2) the source region of measured concentrations of INPs in the Canadian Arctic marine boundary layer. All measurements were made in the Canadian Arctic on board the CCGS Amundsen during the summers of 2014 and 2016. INPs were ubiquitous in the microlayer and bulk seawater samples, and were likely heat-labile biological materials between 0.2 and 0.02 μm in diameter. There was a strong negative correlation between salinity and freezing temperatures, and a strong positive correlation between the fraction of meteoric water in each sample and freezing temperatures, possibly due to INPs associated with terrestrial run-off. Spatial patterns of ...