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| Titel |
On the aerosol weekly cycle spatiotemporal variability over Europe |
| VerfasserIn |
A. K. Georgoulias, K. A. Kourtidis |
| 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 ; 11, no. 10 ; Nr. 11, no. 10 (2011-05-16), S.4611-4632 |
| Datensatznummer |
250009742
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| Publikation (Nr.) |
 copernicus.org/acp-11-4611-2011.pdf |
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| Zusammenfassung |
| In this work, we focus on the spatial and temporal variability of the
aerosol weekly cycle over Europe as these were recorded from TERRA MODIS and
AQUA MODIS satellite instruments. Aerosol optical properties retrieved from
MODIS TERRA (February 2000–February 2009) and AQUA (July 2002–December 2008)
were used to produce an aerosol weekly cycle index. First, the general
aerosol optical depth (AOD550 nm) weekly patterns were defined at a
1° × 1° resolution using the satellite-based index and six regions
of interest were selected. To remove episodic dust transport events, two
different aerosol flags, employing fine mode ratio (FMR550 nm) and
AOD550 nm data, were applied diagnostically, showing that the observed
weekly cycles over Europe are due to continental aerosols. A second spatial
averaging method was then used for the investigation of the weekly
variability and the statistical significance of the weekly cycle over each
of the previously selected regions. Three major weekly cycle plumes are
observed over Europe. A strong positive (higher values during midweek)
weekly cycle plume appears over Central Europe, while a strong negative
(higher values during weekend) weekly plume appears over the Iberian
Peninsula and the North-eastern Europe. The temporal examination of the
weekly cycles shows that in some areas there are seasonal differences in the
sign of the weekly cycle. The aerosol weekly variability over different
regions in Europe was examined in conjunction with the dominating synoptic
wind patterns from the NCEP/NCAR reanalysis, showing that the seasonal
weekly cycle plumes over regions situated in the eastern Europe and the
Mediterranean Sea could be partly attributed to the westerly transport of
continental aerosols. |
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