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Mapping the mesospheric CO2 clouds on Mars: MEx/OMEGA and MEx/HRSC observations and challenges for atmospheric models

Määttänen, Anni and Montmessin, Franck and Gondet, Brigitte and Scholten, Frank and Hoffmann, Harald and González-Galindo, Francisco and Spiga, Aymeric and Forget, François and Hauber, Ernst and Neukum, Gerhard and Bibring, J.-P. and Bertaux, J.-L. (2010) Mapping the mesospheric CO2 clouds on Mars: MEx/OMEGA and MEx/HRSC observations and challenges for atmospheric models. Icarus: International Journal of Solar System Studies, Volume 209 (Issue 2), pp. 452-469. Elsevier. DOI: 10.1016/j.icarus.2010.05.017

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Abstract

This study presents the latest results on the mesospheric CO2 clouds in the martian atmosphere based on observations by OMEGA and HRSC onboard Mars Express. We have mapped the mesospheric CO2 clouds during nearly three martian years of OMEGA data yielding a cloud dataset of 60 occurrences. The global mapping shows that the equatorial clouds are mainly observed in a distinct longitudinal corridor, at seasons Ls = 0–60 and again at and after Ls = 90. A recent observation shows that the equatorial CO2 cloud season may start as early as at Ls = 330. Three cases of mesospheric midlatitude autumn clouds have been observed. Two cloud shadow observations enabled the mapping of the cloud optical depth (s = 0.01–0.6 with median values of 0.13–0.2 at k = 1 lm) and the effective radii (mainly 1–3 lm with median values of 2.0–2.3 lm) of the cloud crystals. The HRSC dataset of 28 high-altitude cloud observations shows that the observed clouds reside mainly in the altitude range 60–85 km and their east–west speeds range from 15 to 107 m/s. Two clouds at southern midlatitudes were observed at an altitude range of 53–62 km. The speed of one of these southern midlatitude clouds was measured, and it exhibited west–east oriented speeds between 5 and 42 m/s. The seasonal and geographical distribution as well as the observed altitudes are mostly in line with previous work. The LMD Mars Global Climate Model shows that at the cloud altitude range (65–85 km) the temperatures exhibit significant daily variability (caused by the thermal tides) with the coldest temperatures towards the end of the afternoon. The GCM predicts the coldest temperatures of this altitude range and the season Ls = 0–30 in the longitudinal corridor where most of the cloud observations have been made. However, the model does not predict supersaturation, but the GCM-predicted winds are in fair agreement with the HRSC-measured cloud speeds. The clouds exhibit variable morphologies, but mainly cirrus-type, filamented clouds are observed (nearly all HRSC observations and most of OMEGA observations). In 15% of OMEGA observations, clumpy, round cloud structures are observed, but very few clouds in the HRSC dataset show similar morphology. These observations of clumpy, cumuliform-type clouds raise questions on the possibility of mesospheric convection on Mars, and we discuss this hypothesis based on Convective Available Potential Energy calculations.

Item URL in elib:https://elib.dlr.de/67443/
Document Type:Article
Title:Mapping the mesospheric CO2 clouds on Mars: MEx/OMEGA and MEx/HRSC observations and challenges for atmospheric models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Määttänen, AnniLaboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Montmessin, FranckLaboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Gondet, BrigitteInstitut d’astrophysique spatiale, Bâtiment 121, Université Paris XI, 91405 Orsay cedex, FranceUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Hoffmann, Haraldharald.hoffmann (at) dlr.deUNSPECIFIED
González-Galindo, FranciscoLaboratoire de météorologie dynamique, CNRS/UPMC, 4 place Jussieu, 75252 Paris cedex 05, FranceUNSPECIFIED
Spiga, AymericDepartment of Physics and Astronomy, The Open University, Milton Keynes, United KingdomUNSPECIFIED
Forget, FrançoisLaboratoire de météorologie dynamique, CNRS/UPMC, 4 place Jussieu, 75252 Paris cedex 05, FranceUNSPECIFIED
Hauber, Ernsternst.hauber (at) dlr.deUNSPECIFIED
Neukum, GerhardFreie Universität, Fachrichtung Planetologie und Fernerkundung, Malteserstr. 74-100, D-12249 Berlin, GermanyUNSPECIFIED
Bibring, J.-P.Institut d’astrophysique spatiale, Bâtiment 121, Université Paris XI, 91405 Orsay cedex, FranceUNSPECIFIED
Bertaux, J.-L.Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Date:October 2010
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Volume 209
DOI :10.1016/j.icarus.2010.05.017
Page Range:pp. 452-469
Publisher:Elsevier
Status:Published
Keywords:Terrestrial planets, Mars, Atmosphere, Structure
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt MARS-EXPRESS / HRSC (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Planetary Geodesy
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:05 Jan 2011 21:07
Last Modified:10 Jan 2019 15:47

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