Space and Planetary Science; Earth and Planetary Sciences (miscellaneous); Geochemistry and Petrology; Geophysics
Abstract :
[en] The upper mesosphere and lower thermosphere of Mars (70–150 km) is of high interest because it is a region affected by climatological/meteorological events in the lower atmosphere and external solar forcing. However, only a few measurements are available at this altitude range. OI 557.7 nm dayglow emission has been detected at these altitudes by the limb observations with Nadir and Occultation for Mars Discovery (NOMAD) aboard the ExoMars Trace Gas Orbiter (TGO). We develop an inversion method to retrieve
density and temperature at these altitudes from the OI 557.7 nm dayglow limb profiles. We demonstrate that the atmospheric density around 90 and 140 km and temperature around 80 km during the daytime can be retrieved from the TGO/NOMAD limb measurements. The retrieved densities show a large seasonal variation both around 90 and 140 km and reach maximum values around perihelion period. This can be explained by temperature variation in the lower atmosphere driven by the dust content and Sun-Mars distance. Temperature around 80 km is higher than predicted by general circulation models, which is tentatively consistent with the warm atmospheric layer recently discovered in nighttime. The temperature retrieval relies on the temperature dependence of the quenching coefficient of 1 S oxygen by CO2. Further validation of this coefficient in the range of the Mars upper atmosphere is needed for the verification of the retrieved high temperature.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Aoki, Shohei ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Department of Complexity Science and Engineering Graduate School of Frontier Sciences The University of Tokyo Kashiwa Japan ; Royal Belgian Institute for Space Aeronomy Brussels Belgium
Gkouvelis, Leonardos ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; NASA/Ames Research Center Moffet Field Mountain View CA USA
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Soret, Lauriane ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Hubert, Benoît ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Lopez‐Valverde, M. A. ; Instituto de Astrofisica de Andalucia‐CSIC Glorieta de la Astronomia Granada Spain
González‐Galindo, F. ; Instituto de Astrofisica de Andalucia‐CSIC Glorieta de la Astronomia Granada Spain
Sagawa, H. ; Faculty of Science Kyoto Sangyo University Kamigamo Motoyama Kyoto Japan
Thomas, I. R. ; Royal Belgian Institute for Space Aeronomy Brussels Belgium
Ristic, B. ; Royal Belgian Institute for Space Aeronomy Brussels Belgium
Willame, Y.; Royal Belgian Institute for Space Aeronomy Brussels Belgium
Depiesse, C. ; Royal Belgian Institute for Space Aeronomy Brussels Belgium
Mason, J.; School of Physical Sciences The Open University Milton Keynes UK
Patel, M. R. ; School of Physical Sciences The Open University Milton Keynes UK
Bellucci, G.; Istituto di Astrofisica e Planetologia Spaziali Roma Italy
Lopez‐Moreno, J.‐J.; Instituto de Astrofisica de Andalucia‐CSIC Glorieta de la Astronomia Granada Spain
Daerden, F. ; Royal Belgian Institute for Space Aeronomy Brussels Belgium
Vandaele, A. C.; Royal Belgian Institute for Space Aeronomy Brussels Belgium
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