Improved ozone monitoring by ground-based FTIR spectrometry

Rodríguez, Omaira; Sanromá, Esther; Schneider, Mat­thias; Hase, Frank; León-Luis, Sergio F.; Blumenstock, Thomas; Hernández, Eliezer Sepúlveda; Redondas, Alberto; Corbella, Virgilio Carreño; Garcı́a, Carlos; Porta, Natalia Prats

doi:10.5194/amt-2021-67

Cited by 2 publications

(19 citation statements)

References 8 publications

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“…In the last years, the IFS 120/5HR has been very stable with a loss of MEA not exceeding 2 % and PE limited to ±0.04 rad throughout the OPD range. As documented by García et al (2021), the ILS time series for the MCT configuration is very consistent with that reported for the InSb detector, corroborating proper instrumental characterization of the IZO FTIR instruments.…”

Section: Instrumental Line Shape Functionsupporting

confidence: 80%

“…Another minor modification affects the absorption lines used for O 3 retrievals, which are a simplification of the refined set-up presented by Schneider et al (2008b). This strategy has been found to provide more precise O 3 estimations than those retrieved from the traditional NDACC approach (1000-1005 cm −1 broad micro-window) when comparing to independent measurements (Schneider et al, 2008a, b;García et al, 2021).…”

Section: Retrieval Strategiesmentioning

confidence: 99%

“…Overall, statistical uncertainties are dominated by measurement noise, baseline, and atmospheric temperature errors (e.g. Schneider et al, 2008aSchneider et al, , 2012García et al, 2012;Sepúlveda et al, 2012;Vigouroux et al, 2018;García et al, 2021).…”

Section: Gasmentioning

confidence: 99%

“…A precise knowledge of the ILS function is essential to properly characterize instrument performance, since the ILS affects the absorption line shape on which the retrieved information is based. This is of particular importance when stratospheric gases are concerned due to the fact that the full width at half maximum of their sharp absorption lines and ILS have similar magnitudes (Schneider et al, 2008a, b;García et al, 2021). Therefore, the ILS function at IZO has been routinely monitored about every 2 months since 1999 using re-filled N 2 O cells at a pressure of 10 Pa.…”

Section: Instrumental Line Shape Functionmentioning

confidence: 99%

“…Quality assessments of different IZO NDACC FTIR products have been partially carried out by previous works (e.g. Schneider et al, 2008a;García et al, 2012;Sepúlveda et al, 2012Sepúlveda et al, , 2014Robles-González et al, 2016;García et al, 2021). Nevertheless, such activities have focused on specific time periods, trace gases, and the application of different approaches.…”

Section: Comparison To Other Reference Observationsmentioning

confidence: 99%

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Twenty years of ground-based NDACC FTIR spectrometry at Izaña Observatory – overview and long-term comparison to other techniques

et al. 2021

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Abstract. High-resolution Fourier transform infrared (FTIR) solar observations are particularly relevant for climate studies, as they allow atmospheric gaseous composition and multiple climate processes to be monitored in detail. In this context, the present paper provides an overview of 20 years of FTIR measurements taken in the framework of the NDACC (Network for the Detection of Atmospheric Composition Change) from 1999 to 2018 at the subtropical Izaña Observatory (IZO, Spain). Firstly, long-term instrumental performance is comprehensively assessed, corroborating the temporal stability and reliable instrumental characterization of the two FTIR spectrometers installed at IZO since 1999. Then, the time series of all trace gases contributing to NDACC at IZO are presented (i.e. C2H6, CH4, ClONO2, CO, HCl, HCN, H2CO, HF, HNO3, N2O, NO2, NO, O3, carbonyl sulfide (OCS), and water vapour isotopologues H216O, H218O, and HD16O), reviewing the major accomplishments drawn from these observations. In order to examine the quality and long-term consistency of the IZO FTIR observations, a comparison of those NDACC products for which other high-quality measurement techniques are available at IZO has been performed (i.e. CH4, CO, H2O, NO2, N2O, and O3). This quality assessment was carried out on different timescales to examine what temporal signals are captured by the FTIR records, and to what extent. After 20 years of operation, the IZO NDACC FTIR observations have been found to be very consistent and reliable over time, demonstrating great potential for climate research. Long-term NDACC FTIR data sets, such as IZO, are indispensable tools for the investigation of atmospheric composition trends, multi-year phenomena, and complex climate feedback processes, as well as for the validation of past and present space-based missions and chemistry climate models.

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Section: Instrumental Line Shape Functionsupporting

confidence: 80%

Section: Retrieval Strategiesmentioning

confidence: 99%

Section: Gasmentioning

confidence: 99%

Section: Instrumental Line Shape Functionmentioning

confidence: 99%

Section: Comparison To Other Reference Observationsmentioning

confidence: 99%

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Twenty years of ground-based NDACC FTIR spectrometry at Izaña Observatory – overview and long-term comparison to other techniques

et al. 2021

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

et al. 2022

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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 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 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 characterization 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 characterization is found to be the continuous monitoring of the ILS function by means of independent observations, such as gas cell measurements.

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Improved ozone monitoring by ground-based FTIR spectrometry

Cited by 2 publications

References 8 publications

Twenty years of ground-based NDACC FTIR spectrometry at Izaña Observatory – overview and long-term comparison to other techniques

Twenty years of ground-based NDACC FTIR spectrometry at Izaña Observatory – overview and long-term comparison to other techniques

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

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