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We report measurements of the evaporation rate of water under Mars-like conditions (CO 2 atmosphere at 7 mbar and ϳ0°C) in which small temperature oscillations about the freezing point repeatedly formed and removed a thin layer of ice. We found that the average evaporation at 2.7 ؎ 0.5°C without an ice layer (corrected for the difference in gravity on Earth and on Mars) was 1.24 ؎ 0.12 mm/h, while at ؊2.1 ؎ 0.3°C with an ice layer the average evaporation rate was 0.84 ؎ 0.08 mm/h. These valuesdoi:10.1089/ast.2006.6.644 pmid:16916288 fatcat:qufxc7qgqzgr7n6bzzutlbutbi