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| Titel |
An effective method for the detection of trace species demonstrated using the MetOp Infrared Atmospheric Sounding Interferometer |
| VerfasserIn |
J. C. Walker, A. Dudhia, E. Carboni |
| 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 ; 4, no. 8 ; Nr. 4, no. 8 (2011-08-03), S.1567-1580 |
| Datensatznummer |
250002075
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| Publikation (Nr.) |
 copernicus.org/amt-4-1567-2011.pdf |
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| Zusammenfassung |
| Fast and reliable methods for the detection of atmospheric trace species are
needed for near-real-time applications including volcanic hazard avoidance.
One common approach using hyperspectral instruments is to measure the difference
in brightness temperature between a small number of target sensitive and
background channels to determine the presence of the target species. Although
fast and robust, current brightness temperature difference methods do not fully
exploit the spectral range and resolution of hyperspectral instruments, and the
noise associated with the measurements remains high. In this paper, we describe
a way to make full use of the spectral information from hyperspectral sounders
allowing the presence of the target species to be determined with much better
sensitivity in near-real-time if required. The technique is demonstrated using
the MetOp Infrared Atmospheric Sounding Interferometer
considering two case studies: (a) the detection of sulphur dioxide from the
eruption of the Kasatochi volcano in Alaska in August 2008, and (b) the
detection of ammonia emissions related to agriculture over Southern Asia in
May 2008. The performance of this method is
compared against that of existing brightness temperature
difference methods. It is found that the sensitivity of the detection
of these trace species is improved by up to an order of magnitude. |
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