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| Titel |
Towards IASI-New Generation (IASI-NG): impact of improved spectral resolution and radiometric noise on the retrieval of thermodynamic, chemistry and climate variables |
| VerfasserIn |
C. Crevoisier, C. Clerbaux, V. Guidard, T. Phulpin, R. Armante, B. Barret, C. Camy-Peyret, J.-P. Chaboureau, P.-F. Coheur, L. Crépeau, G. Dufour, L. Labonnote, L. Lavanant, J. Hadji-Lazaro, H. Herbin, N. Jacquinet-Husson, S. Payan, E. Péquignot, C. Pierangelo, P. Sellitto, C. Stubenrauch |
| 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 ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-10), S.4367-4385 |
| Datensatznummer |
250115990
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| Publikation (Nr.) |
 copernicus.org/amt-7-4367-2014.pdf |
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| Zusammenfassung |
| Besides their strong contribution to weather forecast improvement through
data assimilation, thermal infrared sounders onboard polar-orbiting
platforms are now playing a key role for monitoring atmospheric composition
changes. The Infrared Atmospheric Sounding Interferometer (IASI) instrument
developed by the French space agency (CNES) and launched by EUMETSAT onboard
the Metop satellite series is providing essential inputs for weather
forecasting and pollution/climate monitoring owing to its smart combination
of large horizontal swath, good spectral resolution and high radiometric
performance. EUMETSAT is currently preparing the next polar-orbiting program
(EPS-SG) with the Metop-SG satellite series that should be launched around
2020. In this framework, CNES is studying the concept of a new instrument,
the IASI-New Generation (IASI-NG), characterized by an improvement of both
spectral and radiometric characteristics as compared to IASI, with three
objectives: (i) continuity of the IASI/Metop series; (ii) improvement of
vertical resolution; and (iii) improvement of the accuracy and detection
threshold for atmospheric and surface components. In this paper, we show
that an improvement of spectral resolution and radiometric noise fulfil
these objectives by leading to (i) a better vertical coverage in the lower
part of the troposphere, thanks to the increase in spectral resolution; and (ii)
an increase in the accuracy of the retrieval of several thermodynamic,
climate and chemistry variables, thanks to the improved signal-to-noise
ratio as well as less interference between the signatures of the absorbing
species in the measured radiances. The detection limit of several
atmospheric species is also improved. We conclude that IASI-NG has the
potential to strongly benefit the numerical weather prediction,
chemistry and climate communities now connected through the European
GMES/Copernicus initiative. |
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