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| Titel |
Aerosol pollution in the arid and semi-arid regions of southern Russia |
| VerfasserIn |
Maria Artamonova, Otto Chkhetiani, Evgeny Gledzer, Georgy Golitsyn, Michael Iordansky, Evgeny Kadygrov, Alexey Khapaev, Alexander Knyazev, Michael Kurgansky, Vladimir Lebedev, Leonid Maksimenkov, Vyacheslav Minashkin, Yury Obvintsev, Fedor Pogarsky |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096344
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| Publikation (Nr.) |
 EGU/EGU2014-11841.pdf |
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| Zusammenfassung |
| We present the systematized data results from field measurements of submicron aerosol.
These measurements were carried out in the steppe regions of Rostov region and in
semi-desert areas of Kalmykia Republic (the Caspian lowland) in the summer period of years
2007-2013.
These data include the diurnal variation of the counting and mass aerosol concentration in
the range of 0.1-15 microns, the diurnal variation of the counting and mass concentrations of
the various fractions of submicron aerosol, the elemental composition of aerosol and soil
samples, meteorological parameters of the atmosphere, soil temperature and radiation
balance.
Fine sand fraction (86.6%) is predominant in the soil. It is significantly higher than the
percentage of silt fractions, medium and coarse sand. The chemical composition of sand is
aluminum-silicon one. Elemental and mineralogical analysis of soil and aerosol particles
confirmed the identity of the chemical composition of the soil and the fine fraction of the
aerosol, respectively.
Obtained data show the presence, in hot and dry weather, of convective lifting and outflow
of fine aerosol in the daytime over dry sandy areas and dry loamy soils, in these
areas.
Studies have shown that the removal of the fine aerosol increases proportionally to the
temperature lapse rate in the surface air layer and decreases with increased wind speed.
The coarser fraction of aerosol prevails in the airflow for wind speed of 5 m/s and
more.
Relationship between the aerosol emission and the stability of the atmospheric boundary
layer (Monin-Obukhov length-scale) is considered.
Aerosol mass concentration at different periods of observations (2007-2013) was from a
few dozen to several hundred mg/m3. Calculations of the average annual value of the
convective flow of the aerosol into the atmosphere from sand areas in Kalmykia are
presented.
Distribution of lifted aerosol particles depends on the weather conditions (wind speed,
relative humidity air and soil, surface temperature, radiation balance).
The wind speed influences formation of the spectrum of coming off aerosol particles in
the range of 1-5 μm and jointly with the surface temperature in the range of 0,01-0,1 μm,
correspondingly. In the range 2-15 μm the slope of the spectrum is close to -3, which is
consistent to the recently proposed concept of fragmentation (J. Kox). For submicron
particles (< 1 μm) the spectral slope is close to -5÷-6.
It is planned to use the obtained data for the parameterization of aerosol lifting process
aiming at inclusion of non-saltation convective dust source mechanism into the meso-scale
WRF-Chem model. |
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