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| Titel |
Comparison of operational satellite SO2 products with ground-based observations in northern Finland during the Icelandic Holuhraun fissure eruption |
| VerfasserIn |
I. Ialongo, J. Hakkarainen, R. Kivi, P. Anttila, N. A. Krotkov, K. Yang, C. Li, S. Tukiainen, S. Hassinen, J. Tamminen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 6 ; Nr. 8, no. 6 (2015-06-03), S.2279-2289 |
| Datensatznummer |
250116420
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| Publikation (Nr.) |
 copernicus.org/amt-8-2279-2015.pdf |
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| Zusammenfassung |
This paper shows the results of the comparison of satellite SO2
observations from OMI (Ozone Monitoring Instrument) and OMPS (Ozone Mapping
Profiler Suite) with ground-based measurements during the Icelandic Holuhraun
fissure eruption in September 2014. The volcanic plume reached Finland on
several days during the month of September. The SO2 total columns
from the Brewer direct sun (DS) measurements in Sodankylä
(67.42° N, 26.59° E), northern Finland, are compared to the
satellite data.
The operational satellite SO2 products are evaluated for high
latitude conditions (e.g. large solar zenith angle, SZA). The results show
that the best agreement can be found for lowest SZAs, close-to-nadir
satellite pixels, cloud fraction below 0.3 and small distance between the
station and the centre of the pixel. Under good retrieval conditions, the
difference between satellite data and Brewer measurements remains mostly
below the uncertainty on the satellite SO2 retrievals (up to about
2 DU at high latitudes).
The satellite products assuming a priori profile with SO2
predominantly in the planetary boundary layer give total column values with
the best agreement with the ground-based data.
The analysis of the SO2 surface concentrations at four air quality
stations in northern Finland shows that the volcanic plume coming from
Iceland was located very close to the surface. This is connected to the fact
that this was a fissure eruption and most of the SO2 was emitted into
the troposphere. This is an exceptional case because the SO2 volcanic
emissions directly affect the air quality levels at surface in an otherwise
pristine environment like northern Finland. The time evolution of the
SO2 concentrations peaks during the same days when large SO2
total column values are measured by the Brewer in Sodankylä and enhanced
SO2 signal is visible over northern Finland from the satellite maps.
Thus, the satellite retrievals were able to detect the spatiotemporal
evolution of the volcanic plume as compared to the surface observations.
Furthermore, direct-broadcast SO2 satellite data (from both OMI and
OMPS instruments) are compared for the first time against ground-based
observations. |
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