A222-0005
Line positions and intensities of CO2 for the HITRAN2020 database: updates and validation tests

Wednesday, 16 December 2020
Poster
Ekaterina Karlovets1, Iouli Gordon1, Laurence S Rothman1, Geoffrey C Toon2, Alain Campargue3, Valery I Perevalov4 and Sergey A Tashkun4, (1)Harvard-Smithsonian Center for Astrophysics, Atomic and Molecular Physics, Cambridge, MA, United States, (2)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (3)University of Grenoble Alpes, Laboratory of Interdisciplinary Physics, Grenoble, France, (4)V.E. Zuev Institute of Atmospheric Optics, Laboratory of Theoretical Spectroscopy, Tomsk, Russia
Abstract:
This work discusses the recent and ongoing updates of carbon dioxide line positions and intensities in the upcoming 2020 version of the HITRAN spectroscopic database. These spectroscopic parameters for all naturally abundant CO2 isotopologues are of paramount importance for monitoring concentrations of this gas in the terrestrial atmosphere using ground- and satellite-based spectrometers. They are also crucial for a variety of industrial and planetary applications.

A number of issues related to deficient line positions and intensities have been identified in new laboratory and atmospheric spectra (mainly from the Kitt Peak National Observatory, MkIV balloon, Cavity Ring Down spectra, and the Total Carbon Column Observing Network (TCCON)). Critical validation tests for the spectroscopic data were performed to find problems due to inconsistency of data sources and insufficient accuracy of line parameters in the CO2 line lists. The comparison to the latest version of CDSD-296 [1], ab initio UCL [2,3] and Ames [4] databases and to available experimental works were performed.

Line positions were updated with respect to the most recent edition of the database (HITRAN2016 [5]). The majority of values came from the CDSD-296 database [1]. In addition, for each problematic band, an alternative source of line intensities were proposed. The HITRAN2020 database has been extended by including the new experimental data, in particular, for example, line parameters for the magnetic dipole band of carbon dioxide at 3.3µm [6].

Updated line positions and intensities for the CO2 molecule will have an important impact on current and future remote-sensing missions that monitor CO2 concentrations.

References

[1] Tashkun et al. JQSRT 228 (2019) 124-131, https://doi.org/10.1016/j.jqsrt.2019.03.001.

[2] Zak et al. JQSRT 177 (2016) 31-42, https://doi.org/10.1016/j.jqsrt.2015.12.022.

[3] Yurchenko et al. Monthly Notices of the Royal Astronomical Society 496 (2020) 5282-5291, https://doi.org/10.1093/mnras/staa1874.

[4] Huang et al. JQSRT 203 (2017) 224-241, doi:https://doi.org/10.1016/j.jinf.2020.02.020.

[5] Gordon et al. JQSRT 203 (2017) 3-69, doi:https://doi.org/10.1016/j.jqsrt.2017.06.038.

[6] Trokhimovskiy et al. Astronomy and Astrophysics 639 (2020) A142,https://doi.org/10.1051/004-6361/202038134.

<< Previous Abstract | Next Abstract >>