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High-altitude CO2 Clouds On Mars: Comparison Of OMEGA And HRSC Observations And GCM Predictions

Määttänen, Anni and Montmessin, Franck and Gondet, Brigitte and Scholten, Frank and Hoffmann, Harald and Hauber, Ernst and Gonzalez-Galindo, Francisco and Spiga, Aymeric and Forget, François and Neukum, Gerhard and Bibring, J.-P. and Bartaux, J.-L. (2009) High-altitude CO2 Clouds On Mars: Comparison Of OMEGA And HRSC Observations And GCM Predictions. 41st annual meeting of the Division for Planetary Sciences (DPS), October 4 - 9, 2009, Fajardo, Puerto Rico, USA.

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Official URL: http://www.abstractsonline.com/Plan/ViewAbstract.aspx?mID=2337&sKey=1e2813a8-3f0a-4e5a-9c00-7dc9acdb51b6&cKey=7b48e13a-ce6e-4e25-bdf3-41f9d265bb8f&mKey={38381CEF-2A25-4ED4-81F6-08CED373A512}

Abstract

We will present the recent observations of the high-altitude CO2 clouds on Mars by OMEGA and HRSC on Mars Express. The dataset contains nearly 3 Martian years of data from the two instruments adding up to a total of 60 cloud observations for OMEGA and 23 observations from HRSC with 11 simultaneous observations by the two instruments. The clouds are mainly observed at Ls=0-60° with activity ceasing before the summer solstice, and starts again after Ls=90°. After Ls=120° the clouds are nearly absent in our dataset. The spatial distribution of the clouds is limited in a latitude range of +/-20°N (with two exceptions) and a longitude range -120 - 30°E (3 exceptions). Most of the observed clouds are cirrus-type, filamented clouds, but in 9 OMEGA observations the clouds exhibit round, convective-type structures. It should anyhow be noted that when OMEGA observes near the pericentre, the image is quite narrow inhibiting clear identification of the cloud morphology. The HRSC observations enable accurate cloud altitude measurements, yielding values between 60 and 85 km (+/-2 km) for the near-equatorial clouds. The clouds speeds, related to the prevailing east-west winds, range from 15 to 107 m/s (+/-15 m/s). Two cloud shadow observations show that cloud opacities can go up to τ=0.6 and the effective radii are in the range reff=1-2 μm. A comparison with the LMD Mars Global Climate Model shows a good agreement between the model-predicted winds and those observed by the HRSC. The LMD-MGCM shows that the temperature has a strong diurnal variation at the cloud observation altitudes due to the strong diurnal tide. The coldest temperatures in the near-equator cloud altitude range (60-85 km) are observed towards the end of the afternoon, whereas the warmest temperatures are found in the early morning hours. AM wishes to acknowledge funding from CNES.

Item URL in elib:https://elib.dlr.de/67500/
Document Type:Conference or Workshop Item (Speech)
Title:High-altitude CO2 Clouds On Mars: Comparison Of OMEGA And HRSC Observations And GCM Predictions
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
Hauber, Ernsternst.hauber (at) dlr.deUNSPECIFIED
Gonzalez-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
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
Bartaux, J.-L.Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Date:October 2009
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:HRSC, OMEGA, Mars, High-altitude CO2 Clouds
Event Title:41st annual meeting of the Division for Planetary Sciences (DPS)
Event Location:Fajardo, Puerto Rico, USA
Event Type:international Conference
Event Dates:October 4 - 9, 2009
Organizer:American Astronomical Society, Division for Planetary Sciences
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
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:06 Jan 2011 12:18
Last Modified:06 Jan 2011 12:18

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