Preprints
https://doi.org/10.5194/amt-2021-67
https://doi.org/10.5194/amt-2021-67

  03 May 2021

03 May 2021

Review status: this preprint is currently under review for the journal AMT.

Improved ozone monitoring by ground-based FTIR spectrometry

Omaira E. García1, Esther Sanromá1,a, Matthias Schneider2, Frank Hase2, Sergio Fabián León-Luis1, Thomas Blumenstock2, Eliezer Sepúlveda1, Alberto Redondas1, Virgilio Carreño1, Carlos Torres1, and Natalia Prats1 Omaira E. García et al.
  • 1Izaña Atmospheric Research Centre (IARC), State Meteorological Agency of Spain (AEMet), Santa Cruz de Tenerife, Spain
  • 2Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
  • anow at: Employment Observatory of the Canary Islands (OBECAN), Santa Cruz de Tenerife, Spain

Abstract. Accurate observations of atmospheric ozone (O3) are essential to monitor in detail the key role of O3 in the atmospheric chemistry. The present paper examines the performance of different O3 retrieval strategies from FTIR (Fourier Transform InfraRed) spectrometry by using the 20-year time series of the high-resolution solar spectra acquired from 1999 to 2018 at the subtropical Izaña Observatory (IZO, Spain) within NDACC (Network for the Detection of Atmospheric Composition Change). In particular, the effect of two of the most influential factors have been investigated: the spectral region used for O3 retrievals and inclusion of an atmospheric temperature profile fit. The theoretical and experimental quality assessments of the different FTIR O3 products (total column, TC, amounts and volume mixing ratio, VMR, profiles) provide consistent results. Combining an optimal selection of spectral O3 absorption lines and a simultaneous temperature retrieval results in superior FTIR O3 products, with a precision greater than 0.6–0.7 % for O3 TCs as compared to coincident NDACC Brewer observations used as reference. However, this improvement can be only achieved provided the FTIR spectrometer is properly characterised and stable over time. For unstable instruments, the temperature fit has been found to exhibit a strong negative influence on O3 retrievals by increasing the cross-interference between instrumental performance and temperature retrieval. This cross-interference becomes especially noticeable beyond the upper troposphere/lower stratosphere as documented theoretically, as well as experimentally by comparing FTIR O3 profiles to those measured using Electrochemical Concentration Cell (ECC) sondes within NDACC. Consequently, it should be taken into account for the reliable monitoring of O3 vertical distribution, especially on long-term timescales.

Omaira E. García et al.

Status: open (until 28 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-67', Anonymous Referee #3, 05 May 2021 reply

Omaira E. García et al.

Omaira E. García et al.

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Short summary
Accurate observations of atmospheric ozone (O3) are essential to monitor in detail its key role in the atmospheric chemistry. In this context, the current paper has assessed the effect of using different retrieval strategies on the quality of O3 products from ground-based NDACC FTIR (Fourier Transform Infrared) spectrometry, with the aim of providing an improved O3 retrieval that could be applied at any NDACC FTIR station.