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| Titel |
Towards validation of ammonia (NH3) measurements from the IASI satellite |
| VerfasserIn |
M. Van Damme, L. Clarisse, E. Dammers, X. Liu, J. B. Nowak, C. Clerbaux, C. R. Flechard, C. Galy-Lacaux, W. Xu, J. A. Neuman, Y. S. Tang, M. A. Sutton, J. W. Erisman, P. F. Coheur |
| 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. 3 ; Nr. 8, no. 3 (2015-03-26), S.1575-1591 |
| Datensatznummer |
250116233
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| Publikation (Nr.) |
 copernicus.org/amt-8-1575-2015.pdf |
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| Zusammenfassung |
| Limited availability of ammonia (NH3) observations is currently a barrier
for effective monitoring of the nitrogen cycle. It prevents a full
understanding of the atmospheric processes in which this trace gas is
involved and therefore impedes determining its related budgets. Since the end
of 2007, the Infrared Atmospheric Sounding Interferometer (IASI) satellite
has been observing NH3 from space at a high spatio-temporal resolution.
This valuable data set, already used by models, still needs validation. We
present here a first attempt to validate IASI-NH3 measurements using
existing independent ground-based and airborne data sets. The yearly
distributions reveal similar patterns between ground-based and space-borne
observations and highlight the scarcity of local NH3 measurements as well
as their spatial heterogeneity and lack of representativity. By comparison
with monthly resolved data sets in Europe, China and Africa, we show that
IASI-NH3 observations are in fair agreement, but they are characterized by
a smaller variation in concentrations. The use of hourly and airborne data
sets to compare with IASI individual observations allows investigations of
the impact of averaging as well as the representativity of independent
observations for the satellite footprint. The importance of considering the
latter and the added value of densely located airborne measurements at
various altitudes to validate IASI-NH3 columns are discussed. Perspectives
and guidelines for future validation work on NH3 satellite observations
are presented. |
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