We investigate two possible deep future Earth climate scenarios using a 3-D GCM  when the next supercontinent phase is expected to take place. In Amasia (forming ~200Myr from now) [2,3] the supercontinent forms at high northerly latitudes with the main continents 'squished' north of the equator while an Antarctic subcontinent remains at the south pole. In Aurica (~250Myr) [3,4] a supercontinent forms at low latitudes akin to that of a Sturtian topography. We utilize the forward evolution of plate tectonics, solar luminosity, and rotation rate in our study. The climates differences between these two scenarios are dramatic, with differences in mean surface temperatures approaching several degrees. These results demonstrate that using a simple aquaplanet or a modern Earth land/sea mask is not sufficient to explore the possible variance in theoretical modeling of extrasolar planetary atmospheres.
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