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| Titel |
Evolution of aerosol optical thickness over Europe during the August 2003 heat wave as seen from CHIMERE model simulations and POLDER data |
| VerfasserIn |
A. Hodzic, R. Vautard, H. Chepfer, P. Goloub, L. Menut, P. Chazette, J. L. Deuzé, A. Apituley, P. Couvert |
| 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 ; 6, no. 7 ; Nr. 6, no. 7 (2006-05-30), S.1853-1864 |
| Datensatznummer |
250003892
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| Publikation (Nr.) |
 copernicus.org/acp-6-1853-2006.pdf |
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| Zusammenfassung |
| This study describes the atmospheric aerosol load encountered during the
large-scale pollution episode that occurred in August 2003, by means of the
aerosol optical thicknesses (AOTs) measured at 865 nm by the Polarization
and Directionality of the Earth's Reflectances (POLDER) sensor and the
simulation by the CHIMERE chemistry-transport model. During this period many
processes (stagnation, photochemistry, forest fires) led to unusually high
particle concentrations and optical thicknesses. The observed/simulated AOT
comparison helps understanding the ability of the model to reproduce most of
the gross AOT features observed in satellite data, with a general agreement
within a factor 2 and correlations in the 0.4–0.6 range. However some
important aerosol features are missed when using regular anthropogenic
sources. Additional simulations including emissions and high-altitude
transport of smoke from wildfires that occurred in Portugal indicate that
these processes could dominate the AOT signal in some areas. Our results
also highlight the difficulties of comparing simulated and POLDER-derived
AOTs due to large uncertainties in both cases. Observed AOT values are
significantly lower than the simulated ones (30–50%). Their comparison
with the ground-based Sun photometer Aerosol Robotic Network (AERONET)
measurements suggests, for the European sites considered here, an
underestimation of POLDER-derived aerosol levels with a factor between 1 and
2. AERONET AOTs compare better with simulations (no particular bias) than
POLDER AOTs. |
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