The ν4 bands at 11 µm: linelists for the Trans- and Cis- conformer forms of nitrous acid (HONO) in the 2019 version of the GEISA database

Abstract

Using parameters of line positions and line intensities existing in the literature for the Trans- and Cis- conformer forms of nitrous acid (HONO), we generated, for the first time, a linelist of positions, intensities, and line shape parameters for the ν₄ bands of nitrous acid located at 790.117 and 851.943 cm⁻¹ for the Trans- and Cis- conformers, respectively. A validation of this linelist was performed using spectra recorded by the IASI (Interféromètre Atmosphérique de Sondage Infrarouge) satellite instrument in February 2009 during the (rather) exceptional conditions of the large Australian bush fires. This list, which is now included in the 2020 version of the GEISA database (https://geisa.aeris-data.fr/), is of potential interest for the IASI-NG (Infrared Atmospheric Sounding Interferometer – New Generation) instrument which will be launched on board the METOP-SG satellite in 2021.

GRAPHICAL ABSTRACT

KEYWORDS:

• IASI-NG
• GEISA
• Trans-HONO
• Cis-HONO
• 11 µm

Acknowledgements

This work was supported by the French National programme ANR (ANR-19-CE29-0013) through the ‘QUASARS’ project. The authors thank the AERIS atmospheric and data pole and the CNES French space agency to make available the IASI level 1 data.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Notes

1 Nadir is the downward-facing viewing geometry of an orbiting satellite during remote sensing of the atmosphere.

Additional information

Funding

This work was supported by the Centre National d’Etudes Spatiales; French National Research Agency.