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Título: | Variations in Vertical CO/CO2 Profiles in the Martian Mesosphere and Lower Thermosphere Measured by the ExoMars TGO/NOMAD: Implications of Variations in Eddy Diffusion Coefficient |
Autor: | Yoshida, Nao; Nakagawa, Hiromu; Aoki, Shohei; Erwin, Justin T.; Vandaele, Ann Carine; Daerden, Frank; Thomas, Ian R.; Trompet, Loïc.; Koyama, Shungo; Terada, Naoki; Neary, Lori; Murata, Isao; Villanueva, Geronimo L.; Liuzzi, Giuliano; López-Valverde, M. A. CSIC ORCID ; Brines, Adrian; Modak, Ashimananda; Kasaba, Yasumasa; Ristic, Bojan; Bellucci, Giancarlo; López-Moreno, José Juan CSIC ORCID ; Patel, Manish R. | Palabras clave: | Mars Eddy diffusion coefficient Atmospheric composition Mesosphere Spectroscopy Retrieval |
Fecha de publicación: | 28-may-2022 | Editor: | American Geophysical Union | Citación: | Geophysical Research Letters 49(10): e2022GL098485 (2022) | Resumen: | Using the Nadir and Occultation for MArs Discovery instrument aboard Trace Gas Orbiter, we derived the CO/CO2 profiles between 75 and 105 km altitude with the equivalent width technique. The derived CO/CO2 profiles showed significant seasonal variations in the southern hemisphere with decreases near perihelion and increases near aphelion. The estimation of the CO/CO2 profiles with a one-dimensional photochemical model shows that an altitude-dependent eddy diffusion coefficient better reproduces the observed profiles than a vertically uniform one. Our estimation suggests that the eddy diffusion coefficient in Ls = 240–270 is uniformly larger by a factor of ∼2 than that in Ls = 90–120 in the southern hemisphere, while they are comparable in the northern hemisphere. This fact demonstrates that the eddy diffusion coefficient is variable with season and latitude. © 2022. The Authors. | Descripción: | This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. | Versión del editor: | http://dx.doi.org/10.1029/2022GL098485 | URI: | http://hdl.handle.net/10261/278948 | DOI: | 10.1029/2022GL098485 | ISSN: | 0094-8276 | E-ISSN: | 1944-8007 |
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