lmd_Madeleine2009.bib

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@article{2009Icar..203..390M,
  author = {{Madeleine}, J.-B. and {Forget}, F. and {Head}, J.~W. and {Levrard}, B. and 
	{Montmessin}, F. and {Millour}, E.},
  title = {{Amazonian northern mid-latitude glaciation on Mars: A proposed climate scenario}},
  journal = {\icarus},
  year = 2009,
  month = oct,
  volume = 203,
  pages = {390-405},
  abstract = {{Recent geological observations in the northern mid-latitudes of Mars
show evidence for past glacial activity during the late Amazonian,
similar to the integrated glacial landsystems in the Dry Valleys of
Antarctica. The large accumulation of ice (many hundreds of meters)
required to create the observed glacial deposits points to significant
atmospheric precipitation, snow and ice accumulation, and glacial flow.
In order to understand the climate scenario required for these
conditions, we used the LMD (Laboratoire de Météorologie
Dynamique) Mars GCM (General Circulation Model), which is able to
reproduce the present-day water cycle, and to predict past deposition of
ice consistent with geological observations in many cases. Prior to this
analysis, however, significant mid-latitude glaciation had not been
simulated by the model, run under a range of parameters. In this
analysis, we studied the response of the GCM to a wider range of orbital
configurations and water ice reservoirs, and show that during periods of
moderate obliquity ( {$\epsilon$} = 25-35{\deg}) and high dust opacity (
{$\tau$}$_{dust}$ = 1.5-2.5), broad-scale glaciation in the northern
mid-latitudes occurs if water ice deposited on the flanks of the Tharsis
volcanoes at higher obliquity is available for sublimation. We find that
high dust contents of the atmosphere increase its water vapor holding
capacity, thereby moving the saturation region to the northern
mid-latitudes. Precipitation events are then controlled by topographic
forcing of stationary planetary waves and transient weather systems,
producing surface ice distribution and amounts that are consistent with
the geological record. Ice accumulation rates of {\tilde}10 mm yr
$^{-1}$ lead to the formation of a 500-1000 m thick regional ice
sheet that will produce glacial flow patterns consistent with the
geological observations.
}},
  doi = {10.1016/j.icarus.2009.04.037},
  adsurl = {http://adsabs.harvard.edu/abs/2009Icar..203..390M},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}