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Impact of instrumental line shape characterization on ozone monitoring by FTIR spectrometry

García, Omaira E. ; Sanromá, Esther; Hase, Frank 1; Schneider, Matthias 1; León-Luis, Sergio Fabián; Blumenstock, Thomas ORCID iD icon 1; Sepúlveda, Eliezer; Torres, Carlos; Prats, Natalia; Redondas, Alberto; Carreño, Virgilio
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)

Abstract:

Retrieving high-precision concentrations of atmospheric trace gases from FTIR (Fourier transform infrared) spectrometry requires a precise knowledge of the instrumental performance. In this context, this paper examines the impact on the ozone (O$_{3}$) retrievals of several approaches used to characterize the instrumental line shape (ILS) function of ground-based FTIR spectrometers within NDACC (Network for the Detection of Atmospheric Composition Change). The analysis has been carried out at the subtropical Izaña Observatory (IZO, Spain) by using the 20-year time series of the high-resolution FTIR solar absorption spectra acquired between 1999 and 2018. The theoretical quality assessment and the comparison to independent O$_{3}$ observations available at IZO (Brewer O$_{3}$ total columns and electrochemical concentration cell, ECC, sondes) reveal consistent findings. The inclusion of a simultaneous retrieval of the ILS parameters in the O$_{3}$ retrieval strategy allows, on the one hand, a rough instrumental characterization to be obtained and, on the other hand, the precision of the FTIR O$_{3}$ products to be slightly improved. The improvement is of special relevance above the lower stratosphere, where the cross-interference between the O$_{3}$ vertical distribution and the instrumental performance is more significant. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000150296
Veröffentlicht am 31.08.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 1867-8548
KITopen-ID: 1000150296
HGF-Programm 12.11.13 (POF IV, LK 01) Long-term trends of global atmospheric composition
Erschienen in Atmospheric Measurement Techniques
Verlag Copernicus Publications
Band 15
Heft 15
Seiten 4547–4567
Vorab online veröffentlicht am 11.08.2022
Nachgewiesen in Web of Science
Dimensions
Scopus
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