Study of Dimethyl sulfide, Sulfate Aerosols and Ice Nucleation Particles in the Arctic Summer ...

• Main Author: Ghahremaninezhadgharelar, Roghayeh
• Format: Article in Journal/Newspaper
• Language: English
• Published: Graduate Studies 2016
• Subjects: Environmental Sciences; climate change; Arctic; Climate change
• Online Access: https://dx.doi.org/10.11575/prism/27919; https://prism.ucalgary.ca/handle/11023/3525

Aerosols drive significant radiative forcing and affect Arctic climate. Despite the importance of these aerosols in Arctic climate change, there are some key uncertainties in the estimation of their effects and sources. Size-segregated aerosol, SO2 and precipitation samples were collected on board the Canadian Coast Guard Ship Amundsen in the Arctic during July 2014, to utilize the isotopic composition of sulfate to address the contribution of anthropogenic, biogenic and sea salt sources in formation/growth of aerosol. More than 63% of the average sulfate concentration in the fine aerosols (<0.49 μm) was from biogenic sources. For most samples, δ34S values for SO2 and fine aerosols were similar, suggesting gas-to-particle conversion. δ34S apportionment for precipitation samples suggested a relatively low contribution of the biogenic sulfate source (14±8%) and high contribution of sea salt (82±10%). Also, the size distribution of ice nucleation particles (INPs) in the immersion mode was determined for ...