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Mars was characterized by cataclysmic groundwater-sourced surface floodingthat formed large outflow channels and that may have altered the climate forextensive periods during the Hesperian era. In particular, it has beenspeculated that such events could have induced significant rainfall and causedthe formation of late-stage valley networks.  We present the results of 3-D Global Climate Model simulations reproducingthe short and long term climatic impact of a wide range of outflow channelformation events under cold ancient Mars conditions. We find that the mostintense of these events (volumes of water up to 10$^7 $km$^3$ and released attemperatures up to 320 Kelvins) cannot trigger long-term greenhouse globalwarming, regardless of how favorable are the external conditions (e.g.obliquity and seasons). In any case, outflow channel formation events at anyatmospheric pressure are unable to produce rainfall or significant snowmelt atlatitudes below 40$^{\circ}$N.  On the long term, for an obliquity of $\sim $45$^{\circ}$ and atmosphericpressures $>$ 80 mbar, we find that the lake ice (formed quickly after theoutflow event) is transported progressively southward through the mechanisms ofsublimation and adiabatic cooling. At the same time, and as long as the initialwater reservoir is not entirely sublimated, ice deposits remain in the WestEchus Chasma Plateau region where hints of hydrological activitycontemporaneous with outflow channel formation events have been observed.However, because the high albedo of ice drives Mars to even coldertemperatures, snowmelt produced by seasonal solar forcing is difficult toattain.

3D Modelling of the climatic impact of outflow channel formation events on Early Mars