We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Source apportionment and impact of long-range transport on carbonaceous aerosol particles in Central Germany during HCCT-2010.
- Authors
Poulain, Laurent; Fahlbusch, Benjamin; Spindler, Gerald; Müller, Konrad; van Pinxteren, Dominik; Wu, Zhijun; Iinuma, Yoshiteru; Birmili, Wolfram; Wiedensohler, Alfred; Herrmann, Hartmut
- Abstract
The identification of different sources of the carbonaceous aerosol (organics and black carbon) was investigated at a mountain forest site located in central Germany from September to October 2010 to characterize incoming air masses during the "Hill Cap Cloud Thuringia 2010" (HCCT-2010) experiment. The near-PM1 chemical composition, as measured by an Aerosol Mass Spectrometer (HR-ToF-AMS), was dominated by organics (OA, 41%), followed by sulfate (19%) and nitrate (18%). Source apportionment of the OA fraction was performed using the Multilinear Engine approach (ME-2), resulting in the identification of five factors: Hydrocarbon-like OA (HOA, 3% of OA mass), biomass burning OA (BBOA, 13%), semi20 volatile-like OA (SVOOA, 19%), and two oxygenated OA (OOA) factors. The more-oxidized OOA (MO-OOA, 28%) was interpreted as being influenced by aged polluted continental air masses, whereas the less-oxidized OOA (LO-OOA, 37%) was found to be more linked to aged biogenic sources. Equivalent black carbon (eBC) measured by a multi-angle absorption photometer, MAAP, represented 10% of the total PM. The eBC was clearly associated with the three factors HOA, BBOA, and MO-OOA (all together R² = 0.83). Therefore, eBC's contribution to each factor was achieved using a multi-linear regression model. More than half of the eBC (52%) was associated with long-range transport (i.e. MO-OOA), whereas liquid fuel eBC (35%) and biomass burning eBC (13%) were associated with local emissions leading to a complete apportionment of the carbonaceous aerosol. The separation between local and transported eBC was well supported by the mass size distribution of elemental carbon (EC) from Berner-impactor samples. Air masses with the strongest marine influence based on back trajectory analysis corresponded with a low particle mass concentration (6.4-7.5 μg m-3) and organic fraction ( 30%). However, they also had the largest contribution of primary OA (HOA 4% and BBOA 15-20%), which was associated with local emissions. Continental air masses had the highest mass concentration (11.4-12.6 μg m-3) and a larger fraction of oxygenated OA ( 45%) indicated highly processed OA. The present results emphasize the key role played by long-range transport processes not only on the OA fraction but also on the eBC mass concentration and the importance of improving our knowledge on the identification of eBC sources.
- Subjects
GERMANY; CARBONACEOUS aerosols; AIR masses; BIOMASS burning; ATMOSPHERIC chemistry; LIQUID fuels; MOUNTAIN forests
- Publication
Atmospheric Chemistry & Physics Discussions, 2020, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2020-626