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| Titel |
Variability of aerosol, gaseous pollutants and meteorological characteristics associated with changes in air mass origin at the SW Atlantic coast of Iberia |
| VerfasserIn |
J.-M. Diesch, F. Drewnick, S. R. Zorn, S.-L. Weiden-Reinmüller, M. Martinez, S. Borrmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 8 ; Nr. 12, no. 8 (2012-04-25), S.3761-3782 |
| Datensatznummer |
250011075
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| Publikation (Nr.) |
 copernicus.org/acp-12-3761-2012.pdf |
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| Zusammenfassung |
Measurements of the ambient aerosol were performed at the Southern coast of
Spain, within the framework of the DOMINO (Diel Oxidant
Mechanisms In relation to Nitrogen Oxides)
project. The field campaign took place from 20 November until 9 December 2008 at the atmospheric
research station "El Arenosillo" (37°5'47.76" N,
6°44'6.94" W). As the monitoring station is located at the interface between a natural
park, industrial cities (Huelva, Seville) and the Atlantic Ocean, a variety
of physical and chemical parameters of aerosols and gas phase could be
characterized in dependency on the origin of air masses. Backwards
trajectories were examined and compared with local meteorology to classify
characteristic air mass types for several source regions. Aerosol number and
mass as well as polycyclic aromatic hydrocarbons and black carbon
concentrations were measured in PM1 and size distributions were
registered covering a size range from 7 nm up to 32 μm. The chemical
composition of the non-refractory submicron aerosol (NR-PM1) was measured by means of
an Aerosol Mass Spectrometer (Aerodyne HR-ToF-AMS). Gas phase analyzers
monitored various trace gases (O3, SO2, NO, NO2, CO2)
and a weather station provided meteorological parameters.
Lowest average submicron particle mass and number concentrations were found
in air masses arriving from the Atlantic Ocean with values around 2 μg m−3
and 1000 cm−3. These mass concentrations were about
two to four times lower than the values recorded in air masses of
continental and urban origins. For some species PM1-fractions in marine
air were significantly larger than in air masses originating from Huelva, a
closely located city with extensive industrial activities. The largest
fraction of sulfate (54%) was detected in marine air masses and was to a
high degree not neutralized. In addition, small concentrations of
methanesulfonic acid (MSA), a product of biogenic dimethyl sulfate (DMS)
emissions, could be identified in the particle phase.
In all air masses passing the continent the organic aerosol fraction
dominated the total NR-PM1. For this reason, using Positive Matrix
Factorization (PMF) four organic aerosol (OA) classes that can be associated
with various aerosol sources and components were identified: a
highly-oxygenated OA is the major component (43% OA) while semi-volatile
OA accounts for 23%. A hydrocarbon-like OA mainly resulting from
industries, traffic and shipping emissions as well as particles from wood
burning emissions also contribute to total OA and depend on the air mass
origin.
A significant variability of ozone was observed that depends on the impact
of different air mass types and solar radiation. |
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