Biogenic and anthropogenic sources of aerosols at the High Arctic site Villum Research Station

There are limited measurements of the chemical composition, abundance and sources of atmospheric particles in the High Arctic To address this, we report 93 d of soot particle aerosol mass spectrometer (SP-AMS) data collected from 20 February to 23 May 2015 at Villum Research Station (VRS) in norther...

Full description

Bibliographic Details
Published in:Atmospheric Chemistry and Physics
Main Authors: Nielsen, Ingeborg E., Skov, Henrik, Massling, Andreas, Eriksson, Axel C., Dall'osto, Manuel, Junninen, Heikki, Sarnela, Nina, Lange, Robert, Collier, Sonya, Zhang, Qi, Cappa, Christopher D., Nøjgaard, Jacob K.
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Online Access:https://portal.findresearcher.sdu.dk/da/publications/4645513e-61b1-48ec-867a-025570ee772f
https://doi.org/10.5194/acp-19-10239-2019
https://findresearcher.sdu.dk/ws/files/156558891/Biogenic_and_anthropogenic_sources_of_aerosols_at_the_High_Arctic.pdf
Description
Summary:There are limited measurements of the chemical composition, abundance and sources of atmospheric particles in the High Arctic To address this, we report 93 d of soot particle aerosol mass spectrometer (SP-AMS) data collected from 20 February to 23 May 2015 at Villum Research Station (VRS) in northern Greenland (81?360 N). During this period, we observed the Arctic haze phenomenon with elevated PM1 concentrations ranging from an average of 2.3, 2.3 and 3.3 μg m -3 in February, March and April, respectively, to 1.2 μg m -3 in May. Particulate sulfate (SO2 4-) accounted for 66 % of the non-refractory PM1 with the highest concentration until the end of April and decreasing in May. The second most abundant species was organic aerosol (OA) (24 %). Both OA and PM1, estimated from the sum of all collected species, showed a marked decrease throughout May in accordance with the polar front moving north, together with changes in aerosol removal processes. The highest refractory black carbon (rBC) concentrations were found in the first month of the campaign, averaging 0.2 μg m -3 . In March and April, rBC averaged 0.1 μg m -3 while decreasing to 0.02 μg m -3 in May. Positive matrix factorization (PMF) of the OA mass spectra yielded three factors: (1) a hydrocarbon-like organic aerosol (HOA) factor, which was dominated by primary aerosols and accounted for 12 % of OA mass, (2) an Arctic haze organic aerosol (AOA) factor and (3) a more oxygenated marine organic aerosol (MOA) factor. AOA dominated until mid-April (64 %-81 % of OA), while being nearly absent from the end of May and correlated significantly with SO2-4, suggesting the main part of that factor is secondary OA. The MOA emerged late at the end of March, where it increased with solar radiation and reduced sea ice extent and dominated OA for the rest of the campaign until the end of May (24 %-74 % of OA), while AOA was nearly absent. The highest O=C ratio (0.95) and S=C ratio (0.011) was found for MOA. Our data support the current understanding that Arctic aerosols ...