Modélisation du rayonnement proche infrarouge émis par la haute atmosphère : étude théorique et observationnelle

Abstract : The nightglow is an atmospheric radiation which occurs at high altitude (around 90 km). It comes from the desexcitation of specific molecules and atoms (OH, Na, O2 and O). It spreads over a wide spectral band, especially in the infrared and propagates to the ground level. The nightglow emission is an important mark for the high atmosphere, as it allows the retrieval of the temperature and many dynamic processes such as atmospheric tides or gravity waves. Its propagation to the ground level allows the illumination of terrestrial scene and therefore the night vision with the use of near infrared cameras. In order to have a better knowledge of the emission fluctuations as a function of time for various scales and at various locations, the work is focused on an observational and theoretical study. The observational study produced large scale climatology with the extraction of nightglow emission from GOMOS data. On the other hand, ground measurements highlighted some dynamical aspects such as tides and gravity waves. To model the nightglow emission, it has been necessary to take into account the chemical reactions of the species available at high altitude, the heating, the photodissociation process and the propagation of the emission to the ground. Selected dynamical processes have been included, such as the molecular and turbulent diffusion, and a tide parameterization. Finally, the results of the model are compared to the satellite and ground observations and sensitivity tests are run to estimate the response of the emission to the various modules of the model.
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Christophe Bellisario. Modélisation du rayonnement proche infrarouge émis par la haute atmosphère : étude théorique et observationnelle. Météorologie. Université Paris-Saclay, 2015. Français. ⟨NNT : 2015SACLV027⟩. ⟨tel-01343198⟩

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