Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5055v&link_type=abstract
Journal of Geophysical Research (Planets), Volume 107, Issue E7, pp. 9-1, CiteID 5055, DOI 10.1029/2000JE001539
Physics
13
Planetary Sciences: Orbital And Rotational Dynamics, Planetary Sciences: Interiors (8147), Planetary Sciences: Atmospheres-Structure And Dynamics, Planetary Sciences: Polar Regions
Scientific paper
The Martian atmosphere and the CO2 polar ice caps exchange mass. This exchange, together with the atmospheric response to solar heating, induces variations of the rotation of Mars. Using the angular momentum budget equation of the system solid-Mars-atmosphere-polar ice caps, the variations of Mars' rotation can be deduced from the variations of the angular momentum of the superficial layer; this later is associated with the winds, that is, the motion term, and with the mass redistribution, that is, the matter term. For the ``mean'' Martian atmosphere, without global dust storms, total amplitudes of 10 cm on the surface are obtained for both the annual and semiannual polar motion excited by the atmosphere and ice caps. The atmospheric pressure variations are the dominant contribution to these amplitudes. Length-of-day (lod) variations have amplitudes of 0.253 ms for the annual signal and of 0.246 ms for the semiannual signal. The lod variations are mainly associated with changes in the atmospheric contribution to the mass term, partly compensated by the polar ice cap contribution. We computed lod variations and polar motion for three scenarios having different atmospheric dust contents. The differences between the three sets of results for lod variations are about one order of magnitude larger than the expected accuracy of the NEtlander Ionosphere and Geodesy Experiment (NEIGE) for lod. It will thus be possible to constrain the global atmospheric circulation models from the NEIGE measurements.
de Viron Olivier
Defraigne Pascale
Dehant Véronique
Forget Francois
Hoolst Tim Van
No associations
LandOfFree
Influence of the seasonal winds and the CO2 mass exchange between atmosphere and polar caps on Mars' rotation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Influence of the seasonal winds and the CO2 mass exchange between atmosphere and polar caps on Mars' rotation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Influence of the seasonal winds and the CO2 mass exchange between atmosphere and polar caps on Mars' rotation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-735068