Where does the optically detectable aerosol in the European Arctic come from?

• Published in: Tellus B: Chemical and Physical Meteorology
• Main Authors: Maria Stock, Christoph Ritter, Veijo Aaltonen, Wenche Aas, DõRthe Handorff, Andreas Herber, Renate Treffeisen, Klaus Dethloff
• Format: Article in Journal/Newspaper
• Language: English
• Published: Stockholm University Press 2014
• Subjects: Arctic haze; photometer; AOD; pollution pathways; EOF analysis; Meteorology. Climatology; QC851-999; Arctic; Ny-Ålesund; Sodankylä; North Atlantic; North Atlantic oscillation; Ny Ålesund; Siberia
• Online Access: https://doi.org/10.3402/tellusb.v66.21450; https://doaj.org/article/659e81e1889e4e1ba6b0e710c21b06d9

In this paper, we pose the question where the source regions of the aerosol, which occurs in the European Arctic, are located. Long-term aerosol optical depth (AOD) data from Ny-Ålesund and Sodankylä as well as short-term data from a campaign on a Russian drifting station were analysed by air backtrajectories, analysis of the general circulation pattern and a correlation to chemical composition from in-situ measurements. Surprisingly, our data clearly shows that direct transport of pollutants from Europe does not play an important role. Instead, Arctic haze in Ny-Ålesund has been found for air masses from the Eastern Arctic, while events with increased AOD but chemically more diverse composition have been found for air from Siberia or the central Arctic. Moreover, the AOD in Ny-Ålesund does not depend on the North Atlantic Oscillation (NAO). Hence, either the pollution pathways of aerosol are more complex or aerosol is significantly altered by clouds.