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| Titel |
Monitoring volcanic ash cloud top height through simultaneous retrieval of optical data from polar orbiting and geostationary satellites |
| VerfasserIn |
K. Zakšek, M. Hort, J. Zaletelj, B. Langmann |
| 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 ; 13, no. 5 ; Nr. 13, no. 5 (2013-03-05), S.2589-2606 |
| Datensatznummer |
250018473
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| Publikation (Nr.) |
 copernicus.org/acp-13-2589-2013.pdf |
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| Zusammenfassung |
| Volcanic ash cloud-top height (ACTH) can be monitored on the global level
using satellite remote sensing. Here we propose a photogrammetric method
based on the parallax between data retrieved from geostationary and polar
orbiting satellites to overcome some limitations of the existing methods of
ACTH retrieval. SEVIRI HRV band and MODIS band 1 are a good choice because
of their high resolution. The procedure works well if the data from both
satellites are retrieved nearly simultaneously. MODIS does not retrieve the
data at exactly the same time as SEVIRI. To compensate for advection we use
two sequential SEVIRI images (one before and one after the MODIS retrieval)
and interpolate the cloud position from SEVIRI data to the time of MODIS
retrieval. The proposed method was tested for the case of the
Eyjafjallajökull eruption in April 2010. The parallax between MODIS and
SEVIRI data can reach 30 km, which implies an ACTH of approximately 12 km at
the beginning of the eruption. At the end of April eruption an ACTH of
3–4 km is observed. The accuracy of ACTH was estimated to be 0.6 km. |
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