Kate Fishbaugh




INVESTIGATION OF THE RESIDENCE TIME OF A MARTIAN NORTHERN OCEAN AND IMPLICATIONS FOR THE MEGAOUTFLO HYPOTHESIS

Purpose
The purpose of this paper is to estimate how long a proposed Martian northern ocean [e.g. Parker et al., 1989; Baker et al., 1991] might reside on the Martian surface in order to assess the time-scale of the climatic cycle associated with the MEGAOUTFLO hypothesis [Baker, et al., 1991, 2000]. The implications of this estimation will be to assess whether the timing between "transient maritime climates" in Bakers model agrees with the timescale of formation of the major outflow channels. This should help to determine whether Bakers model is realistic time-wise and how many outflow-channel forming events may have occurred in the history of Mars assuming Bakers mode of formation. Several mechanisms could cause the ocean to disappear. These include: evaporation, freezing, and percolation into the regolith. I will investigate all of these mechanisms and combinations thereof. Due to the assumptions involved, the times calculated will of course be first-order estimates. I hope to be able to determine the numerical uncertainties involved. I have not yet worked out exactly how I will calculate these values. More to come . . . .

OUTLINE
I. Introduction and Background

II. Estimation of Ocean Residence Time
III. Summary of Results and Implications

Data to be used: will use results of previous studies to get: the volume of the proposed ocean, porosity of the regolith, evaporation rates, etc.

References (incomplete list of course):
Clifford, S., A model for the hydrologic and climatic behavior of water on Mars, JGR, 1993.
Head et al., Science, 1999.
Baker et al., 1991.
Baker et al., 2000.