Validation of spectroscopic data in the 1.27 µm spectral region by comparisons with ground-based atmospheric measurements

Tran, Duc; Delahaye, Thibault; Armante, R.; Hartmann, Jean‐Michel; Mondelain, D.; Campargue, A.; Fleurbaey, Hélène; Hodges, Joseph

doi:10.1016/j.jqsrt.2020.107495

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…Where ρ are densities in amagat,

B_{O_{2} - O_{2}}

and

B_{O_{2} - N_{2}}

are the binary collision absorption coefficients in cm −1 amagat −2 .

M_{O_{2}} (ν) ρ_{O_{2}}

is the local monomer contribution due to the 1.27 µm band of O 2 that was generated using the most recent spectroscopic data [see (Tran et al., 2021) and references therein]. A speed dependent Nelkin‐Ghatak profile was used for these intense lines and a Voigt profile for the others, with a cutoff value of ±5 cm −1 from the line center.…”

Section: Spectra Analysismentioning

confidence: 99%

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

et al. 2021

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The 1.27 μm O2 band is increasingly called upon for air‐mass determination from ground‐based and space‐borne atmospheric spectra because of its spectral proximity to CO2, and CH4 bands at 1.6 μm, in contrast to the more distant A‐band at 0.76 μm. For this purpose, it is important to well characterize not only the narrow absorption lines but also the strong underlying broad collision‐induced absorption (CIA) structure and its temperature dependence. Spectra of pure O2, and of O2 in N2, were recorded by cavity ring down spectroscopy (CRDS) at 271 K and 332 K, with the help of a newly developed temperature regulated cell. The quality of the spectra allowed determining the small variations (at the few percent level) of the BO2−O2, BO2−N2, and BO2−air binary coefficients with temperature. Together with the binary coefficients at 297 K reported previously, they allow characterizing the temperature dependence of the O2 CIA at 1.27 µm in atmospheric conditions. The obtained results are compared with previous measurements by Fourier transform spectroscopy (FTS) and recent theoretical calculations. In the wings of the O2‐O2 CIA, an increase with temperature is observed in agreement with calculations but contrary to these calculations, a decrease is observed near the maximum of the CIA band. The temperature dependence is found in good agreement with the theoretical BN2−O2values and the experimental BO2−air values derived from the FTS measurements. Binary coefficients integrated over the entire band show almost no variation with temperature for O2‐N2 and a small increase for pure O2, in agreement with the theoretical predictions.

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“…Where ρ are densities in amagat,

B_{O_{2} - O_{2}}

and

B_{O_{2} - N_{2}}

are the binary collision absorption coefficients in cm −1 amagat −2 .

M_{O_{2}} (ν) ρ_{O_{2}}

Section: Spectra Analysismentioning

confidence: 99%

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

et al. 2021

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“…The study by Mendonca et al (2019) is the first to show the need for a spectral line shape that takes into account speed-dependence. Since then, newer spectroscopic studies such as Tran et al (2020) and Fleurbaey et al (2021) Tran et al (2021). The study showed that the newer spectroscopic parameters slightly improved the quality of the spectral fit but they should also be assessed on how they impact the airmass dependence of retrieved O 2 columns.…”

Section: Telluric and Solar Line Listsmentioning

confidence: 99%

The Total Carbon Column Observing Network's GGG2020 Data Version

Laughner,

Toon,

Mendonca

et al. 2023

Preprint

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Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs) beginning in 2004 from over 30 current or past measurement sites around the world, using solar absorption spectroscopy in the near infrared region. TCCON GHG data have been used extensively for multiple purposes, including in studies of the carbon cycle and anthropogenic emissions as well as to validate and improve observations made from spacebased sensors. Here, we describe an update to the retrieval algorithm used to process the TCCON near IR solar spectra and the associated data product. This version, called GGG2020, was initially released in April 2022. It includes updates and improvements to all steps of the retrieval, including but not limited to: converting the original interferograms into spectra, the spectroscopic information used in the column retrieval, post hoc airmass dependence correction, and scaling to align with the calibration scales of in situ GHG measurements. All TCCON data are available through tccondata.org and hosted on CaltechDATA (data.caltech.edu). Each TCCON site has a unique DOI for its data record. An archive of all sites’ data is also available with the DOI 10.14291/TCCON.GGG2020 (Total Carbon Column Observing Network (TCCON) Team, 2022). The hosted files are updated approximately monthly, and TCCON sites are required to deliver data to the archive no later than one year after acquisition. Full details of data locations are provided in the data availability section.

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“…In the initial CRDS study of CIA in the 1. 27 [12]. The broad wavenumber ranges covered, 7550 cm − 1 -8360 cm − 1 at 271 K and 332 K, and cm − 1 -8466 cm − 1 at 297 K, were achieved using a combination of distributed feedback and external cavity diode lasers.…”

Section: Experimental and Theoretical Ciamentioning

confidence: 99%

“…Unlike the Maté et al data [14], these spectra were collected below 1 amagat (which is more representative of atmospheric conditions), and measurements were made in the troughs between the monomer absorption lines. As described above, the CIA was determined as the remaining absorption after having subtracted the measured Rayleigh scattering and monomer absorption [26,27]. The reported binary collision absorption coefficient was based on a spline fit to the CIA measurements in the trough segments.…”

Section: Experimental and Theoretical Ciamentioning

confidence: 99%

Parameterized model to approximate theoretical collision-induced absorption band shapes for O2-O2 and O2-N2

Adkins

Karman

Campargue

et al. 2023

Journal of Quantitative Spectroscopy and Radiative Transfer

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Validation of spectroscopic data in the 1.27 µm spectral region by comparisons with ground-based atmospheric measurements

Cited by 7 publications

References 33 publications

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

The Total Carbon Column Observing Network's GGG2020 Data Version

Parameterized model to approximate theoretical collision-induced absorption band shapes for O2-O2 and O2-N2

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Validation of spectroscopic data in the 1.27 µm spectral region by comparisons with ground-based atmospheric measurements

Cited by 7 publications

References 33 publications

Temperature Dependence of the Collision‐Induced Absorption Band of O2 Near 1.27 µm

Temperature Dependence of the Collision‐Induced Absorption Band of O2 Near 1.27 µm

The Total Carbon Column Observing Network's GGG2020 Data Version

Parameterized model to approximate theoretical collision-induced absorption band shapes for O2-O2 and O2-N2

Contact Info

Product

Resources

About

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm

Temperature Dependence of the Collision‐Induced Absorption Band of O₂ Near 1.27 µm