Characterization of Warm Layers in the Martian Atmosphere with the Imaging Ultraviolet Spectrograph on board the Mars Atmosphere and Volatile Evolution Spacecraft - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2020

Characterization of Warm Layers in the Martian Atmosphere with the Imaging Ultraviolet Spectrograph on board the Mars Atmosphere and Volatile Evolution Spacecraft

Résumé

The mesospheres of Venus, Earth, and Mars exhibit frequent and persistent warm layers, regions of limited spatial extent with temperatures tens of Kelvin above nearby altitudes. While not being well reproduced by existing models, the study of these warm layers may extend our understanding of physical processes in the mesosphere, such as transportation, wave interactions, and thus the coupling between lower and upper atmospheres. Although it is not been adequately investigated on Venus and Mars, mesospheric warm layers on Earth have been well studied in the past decades. In terrestrial studies the warm layers are referred to as Mesospheric Inversion Layers or MILs. Several mechanisms have been proposed for its formation, including gravity wave breaking, gravity wave and tidal interactions, and chemical heating. Two distinct persistent MILs have been observed on Earth, namely lower and upper MILs, at about 75 and 95 km, respectively, which are not discovered in previous studies on Mars or Venus. In this study, we statistically study the temporal and spatial distribution of warm layers on Mars with IUVS stellar occultation measurement and report the discovery of two distinct mesospheric warm layers, which are similar as their counterparts on Earth. We also discuss the distribution and characteristics of the Martian warm layers and compare their properties with terrestrial MILs.
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Dates et versions

insu-04491156 , version 1 (05-03-2024)

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F. Jiang, R. V. Yelle, H. Nakagawa, N. M. Schneider, S. Jain, et al.. Characterization of Warm Layers in the Martian Atmosphere with the Imaging Ultraviolet Spectrograph on board the Mars Atmosphere and Volatile Evolution Spacecraft. American Geophysical Union, Fall Meeting 2020, Dec 2020, Online, Unknown Region. pp.abstract #P040-01. ⟨insu-04491156⟩
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