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| Titel |
Single particle analysis of eastern Mediterranean aerosol particles: Influence of the source region on the chemical composition |
| VerfasserIn |
Hans-Christian Clemen, Johannes Schneider, Franziska Köllner, Thomas Klimach, Michael Pikridas, Iasonas Stavroulas, Jean Sciare, Stephan Borrmann |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140963
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| Publikation (Nr.) |
 EGU/EGU2017-4419.pdf |
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| Zusammenfassung |
| The Mediterranean region is one of the most climatically sensitive areas and is influenced by
air masses of different origin. Aerosol particles are one important factor contributing to the
Earth‘s radiative forcing, but knowledge about their composition and sources is still
limited.
Here, we report on results from the INUIT-BACCHUS-ACTRIS campaign, which was
conducted at the Cyprus Atmospheric Observatory (CAO, Agia Marina Xyliatou)
in Cyprus in April 2016. Our results show that the chemical composition of the
aerosol particles in the eastern Mediterranean is strongly dependent on their source
region.
The composition of particles in a size range between 150 nm and 3 μm was measured
using the Aircraft-based Laser ABlation Aerosol MAss spectrometer (ALABAMA), which is
a single particle laser ablation instrument using a bipolar time-of-flight mass spectrometer.
The mass spectral information on cations and anions allow for the analysis of different
molecular fragments. The information about the source regions results from backward
trajectories using HYSPLIT Trajectory Model (Trajectory Ensemble) on hourly
basis. To assess the influence of certain source regions on the air masses arriving at
CAO, we consider the number of trajectories that crossed the respective source
region within defined time steps. For a more detailed picture also the height and the
velocity of the air masses during their overpass above the source regions will be
considered.
During the campaign at CAO in April 2016 three main air mass source regions were
observed: 1) Northern Central Europe, likely with an enhanced anthropogenic influence (e.g.
sulfate and black carbon from combustion processes, fly ash particles from power plants,
characterized by Sr and Ba), 2) Southwest Europe, with a higher influence of the
Mediterranean Sea including sea salt particles (characterized by, e.g., NaxCly, NaClxNOy),
3) Northern Africa/Sahara, with air masses that are expected to have a higher load of mineral
dust particles (characterized by typical elements like Al, Si, Ca, Fe). To estimate the influence
of the selected regions, we compare the time series of the dominating elements or
molecular fragments to the times with trajectories from specific source regions. For
differentiation between short and long-range transported particles, molecules that are
typical for aging processes in the atmosphere, e.g., products from reaction with
ozone, nitric and sulfuric acid will be considered. Additionally, modifications of
the internal mixing state of the particles during the measurement period will be
studied.
This project was supported by DFG (FOR 1525 "INUIT) and has received funding from
the European Union‘s Seventh Framework Programme (FP7) project BACCHUS
under grant agreement no. 603445 and from the European Union’s Horizon 2020
research and innovation programme ACTRIS-2 under grant agreement No 654109. |
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