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| Titel |
A case study on biomass burning aerosols: effects on aerosol optical properties and surface radiation levels |
| VerfasserIn |
A. Arola, A. Lindfors, A. Natunen, K. E. J. Lehtinen |
| 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 ; 7, no. 16 ; Nr. 7, no. 16 (2007-08-20), S.4257-4266 |
| Datensatznummer |
250005167
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| Publikation (Nr.) |
 copernicus.org/acp-7-4257-2007.pdf |
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| Zusammenfassung |
| In spring 2006, biomass burning aerosols from eastern Europe were
transported extensively to Finland, and to other parts of northern
Europe. They were observed as far as in the European Arctic. In
the first part of this paper, temporal
and spatial evolution and transport of these biomass burning
aerosols are monitored with MODIS retrieved aerosol optical
depth (AOD) imagery at visible wavelengths (0.55 μm). Comparison of MODIS
and AERONET AOD is conducted at Tõravere, Estonia. Then trajectory
analyses, as well as MODIS Fire Mapper products are used to better understand
the type and origin of the air masses. During the studied four-week
period AOD values ranged from near zero up to 1.2 at 0.55 μm
and the linear correlation between MODIS and AERONET was very high
(~0.97). Temporal variability observed within this four-week
period was also
rather well explained by the trajectory analysis in conjunction
with the fire detections produced by the MODIS Rapid Response
System. In the second part of our study, the surface measurements
of global and UV radiation at Jokioinen, Finland are used
to study the effect of this haze episode on the levels of surface
radiation. We found reductions up to 35% in noon-time surface UV irradiance
(at 340 nm) as compared to typical aerosol conditions. For global
(total solar) radiation, the reduction was always smaller, in line
with the expected wavelength dependence of the aerosol effect. |
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