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Mars topographic clouds: MAVEN/IUVS observations and LMD MGCM predictions
Schneider, Nicholas M.; Connour, Kyle; Forget, Francois et al.
2017DPS meeting 2017
 

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Abstract :
[en] The Imaging Ultraviolet Spectrograph (IUVS) instrument on the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft takes mid-UV spectral images of the Martian atmosphere. From these apoapse disk images, information about clouds and aerosols can be retrieved and comprise the only MAVEN observations of topographic clouds and cloud morphologies. Measuring local time variability of large-scale recurring cloud features is made possible with MAVEN’s ~4.5-hour elliptical orbit, something not possible with sun-synchronous orbits. We have run the LMD MGCM (Mars global circulation model) at 1° x 1° resolution to simulate water ice cloud formation with inputs consistent with observing parameters and Mars seasons. Topographic clouds are observed to form daily during the late mornings of northern hemisphere spring and this phenomenon recurs until late summer (Ls = 160°), after which topographic clouds wane in thickness. By northern fall, most topographic clouds cease to form except over Arsia Mons and Pavonis Mons, where clouds can still be observed. Our data show moderate cloud formation over these regions as late as Ls = 220°, something difficult for the model to replicate. Previous studies have shown that models have trouble simulating equatorial cloud thickness in combination with a realistic amount of water vapor and not-too-thick polar water ice clouds, implying aspects of the water cycle are not fully understood. We present data/model comparisons as well as further refinements on parameter inputs based on IUVS observations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Schneider, Nicholas M.;  LASP, U. Colorado
Connour, Kyle;  LASP, U. Colorado
Forget, Francois;  LMD
Deighan, Justin;  LASP, U. Colorado
Jain, Sonal;  LASP, U. Colorado
Vals, Margaux;  LMD
Wolff, Michael J.;  SSI
Chaffin, Michael S.;  LASP, U. Colorado
Crismani, Matteo;  LASP, U. Colorado
Stewart, A. Ian F.;  LASP, U. Colorado
McClintock, William E.;  LASP, U. Colorado
Holsclaw, Greg;  LASP, U. Colorado
Lefevre, Franck;  LATMOS
Montmessin, Franck;  LATMOS
Stiepen, Arnaud ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Stevens, Michael H.;  NRL
Evans, J. Scott;  CPI
Yelle, Roger;  LPL, U. Arizona
Lo, Daniel;  LPL, U. Arizona
Clarke, John T.;  Boston U
Jakosky, Bruce M.;  LASP, U. Colorado)
More authors (11 more) Less
Language :
English
Title :
Mars topographic clouds: MAVEN/IUVS observations and LMD MGCM predictions
Publication date :
01 October 2017
Event name :
DPS meeting 2017
Event date :
du 16 au 20 octobre 2017
Audience :
International
Available on ORBi :
since 15 November 2017

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