Nitric acid retrieval in the Antarctic atmosphere with all-sky IASI spectra and comparison with aura-MLS observations

Guido Masiello; Carmine Serio; Giuliano Liuzzi; Pamela Pasquariello; Federico Donat; Tiziano Maestri; Michele Martinazzo; Rocco Giosa; Lorenzo Cassini

doi:10.1117/12.3031402

20 November 2024 Nitric acid retrieval in the Antarctic atmosphere with all-sky IASI spectra and comparison with aura-MLS observations

Guido Masiello, Carmine Serio, Giuliano Liuzzi, Pamela Pasquariello, Federico Donat, Tiziano Maestri, Michele Martinazzo, Rocco Giosa, Lorenzo Cassini

Author Affiliations +

Proceedings Volume 13193, Remote Sensing of Clouds and the Atmosphere XXIX; 1319308 (2024) https://doi.org/10.1117/12.3031402
Event: Remote Sensing, 2024, Edinburgh, United Kingdom

Abstract

Nitric acid is a key gas for understanding the processes leading to ozone depletion in Antarctica. The Antarctica ozone hole is a cyclic phenomenon that begins in early September when the region exits the polar night and fully develops in October-November. Nitric acid is the primary constituent of stratospheric aerosol. In the Antarctic region, when the temperature gets below 195K, it condenses from the gas phase to NAT or nitric acid trihydrate (HNO₃·3H₂O) in the form of ice crystals. Recently, we have developed a new forward/inverse model capable of computing the top-ofatmosphere infrared spectral radiance in all-sky conditions (clear/cloudy, day/night) and surface type (land or ocean). The new forward/inverse system has been applied to IASI (infrared Atmospheric Sounder interferometer) to retrieve O₃ and HNO₃ simultaneously. We have analyzed data for September 2021 and 2023, and HNO₃ column retrievals have been compared to those observed with the MLS (Microwave Limb Sounder) instrument to check the capability of IASI to estimate HNO₃. The paper also addresses the relationship between HNO₃ and O₃, especially at the onset of the ozone hole in the early spring. It will be shown that ozone depletion is paralleled by a consistent diminishing of HNO₃ from the gas phase.

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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Guido Masiello, Carmine Serio, Giuliano Liuzzi, Pamela Pasquariello, Federico Donat, Tiziano Maestri, Michele Martinazzo, Rocco Giosa, and Lorenzo Cassini "Nitric acid retrieval in the Antarctic atmosphere with all-sky IASI spectra and comparison with aura-MLS observations", Proc. SPIE 13193, Remote Sensing of Clouds and the Atmosphere XXIX, 1319308 (20 November 2024); https://doi.org/10.1117/12.3031402

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