DR. RICHARDSON WILL WORK WITH THE PI AND CO-I ALEJANDRO SOTO TO MODEL WATER ICE DEPOSITION UNDER DIFFERING CLIMATE SCENARIOS FOR MARS. SPECIFICALLY THE MARSWRF GCM WILL BE USED TO EXAMINE ICE SHEET DEPOSITION FOR A RANGE OF DIFFERING ORBITAL FORCING PARAMETERS AND FOR A RANGE OF TOTAL ATMOSPHERIC CO2 INVENTORIES.