Preprints
https://doi.org/10.5194/amt-2022-44
https://doi.org/10.5194/amt-2022-44
 
30 Mar 2022
30 Mar 2022
Status: this preprint is currently under review for the journal AMT.

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

Omaira Elena García1, Esther Sanromá1,a, Frank Hase2, Matthias Schneider2, Sergio Fabián León-Luis3, Thomas Blumenstock2, Eliezer Sepúlveda1, Carlos Torres1, Natalia Prats1, Alberto Redondas1, and Virgilio Carreño1 Omaira Elena García et al.
  • 1Izaña Atmospheric Research Centre (IARC), State Meteorological Agency of Spain (AEMet), Santa Cruz de Tenerife, Spain
  • 2Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
  • 3TRAGSATEC, Madrid, Spain
  • anow at: Employment Observatory of the Canary Islands (OBECAN), Santa Cruz de Tenerife, Spain

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 (O3) retrievals of several approaches used to characterise 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 O3 observations available at IZO (Brewer O3 total columns and Electrochemical Concentration Cell, ECC, sondes) reveal consistent findings. The inclusion of a simultaneous retrieval of the ILS parameters in the O3 retrieval strategy allows, on the one hand, a rough instrumental characterisation to be obtained and, on the other hand, the precision of the FTIR O3 products to be slightly improved. The improvement is of special relevance above the lower stratosphere, where the cross-interference between the O3 vertical distribution and the instrumental performance is more significant. However, it has been found that the simultaneous ILS retrieval leads to a misinterpretation of the O3 variations on daily and seasonal scales. Therefore, in order to ensure the independence of the O3 retrievals and the instrumental response, the optimal approach to deal with the FTIR instrumental characterisation is found to be the continuous monitoring of the ILS function by means of independent observations, such as gas-cell measurements.

Omaira Elena García et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-44', Anonymous Referee #2, 23 Apr 2022
  • RC2: 'Comment on amt-2022-44 “Impact of instrumental line shape characterisation on ozone monitoring by FTIR spectrometry” by Omaira E. García et al.', Anonymous Referee #1, 03 May 2022

Omaira Elena García et al.

Omaira Elena García et al.

Viewed

Total article views: 305 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
236 60 9 305 3 3
  • HTML: 236
  • PDF: 60
  • XML: 9
  • Total: 305
  • BibTeX: 3
  • EndNote: 3
Views and downloads (calculated since 30 Mar 2022)
Cumulative views and downloads (calculated since 30 Mar 2022)

Viewed (geographical distribution)

Total article views: 265 (including HTML, PDF, and XML) Thereof 265 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 30 Jun 2022
Download
Short summary
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 (O3) retrievals of several approaches used to characterise the Instrumental Line Shape (ILS) function of ground-based FTIR spectrometers within NDACC (Network for the Detection of Atmospheric Composition Change).