Journal
ATMOSPHERIC MEASUREMENT TECHNIQUES
Volume 8, Issue 3, Pages 1575-1591Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/amt-8-1575-2015
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Funding
- F.R.S.-FNRS
- Belgian State Federal Office for Scientific, Technical and Cultural Affairs (Prodex) [4000111403 IASI.FLOW]
- Fonds pour la formation a la recherche dans l'industrie et dans l'agriculture of Belgium
- CNES
- project Effects of Climate Change on Air Pollution Impacts and Response Strategies for European Ecosystems (ECLAIRE) under the EC 7th Framework Programme [282910]
- EC under the 7th Framework Programme
- Natural Environment Research Council [NE/L013371/1] Funding Source: researchfish
- NERC [NE/L013371/1] Funding Source: UKRI
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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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