Measurements of aerosol and CCN properties in the Mackenzie River delta (Canadian Arctic) during spring-summer transition in May 2014 ...

• Main Authors: Herenz, Paul, Wex, Heike, Henning, Silvia, Kristensen, Thomas Bjerring, Rubach, Florian, Roth, Anja, Borrmann, Stephan, Bozem, Heiko, Schulz, Hannes, Stratmann, Frank
• Format: Article in Journal/Newspaper
• Language: English
• Published: Katlenburg-Lindau : EGU 2018
• Subjects: aerosol; air mass; cloud condensation nucleus; concentration composition; long range transport; particle size; seasonal variation; size distribution; Canada; Canadian Arctic; Mackenzie Delta; Northwest Territories; Siberia; Tuktoyaktuk; 550; Arctic; Mackenzie River; Pacific; Aitken; Mackenzie river
• Online Access: https://dx.doi.org/10.34657/11116; https://oa.tib.eu/renate/handle/123456789/12082

Within the framework of the RACEPAC (Radiation-Aerosol-Cloud Experiment in the Arctic Circle) project, the Arctic aerosol, arriving at a ground-based station in Tuktoyaktuk (Mackenzie River delta area, Canada), was characterized during a period of 3 weeks in May 2014. Basic meteorological parameters and particle number size distributions (PNSDs) were observed and two distinct types of air masses were found. One type were typical Arctic haze air masses, termed accumulation-type air masses, characterized by a monomodal PNSD with a pronounced accumulation mode at sizes above 100 nm. These air masses were observed during a period when back trajectories indicate an air mass origin in the north-east of Canada. The other air mass type is characterized by a bimodal PNSD with a clear minimum around 90ĝ€†nm and with an Aitken mode consisting of freshly formed aerosol particles. Back trajectories indicate that these air masses, termed Aitken-type air masses, originated from the North Pacific. In addition, the ...