Maps of CO2 ice condensation(+)/sublimation(–) mean day rates (averaged over 50 Earth days) for TRAPPIST-1g and h. Wind vectors at 5 km are presented as black arrows (see the 50 m s−1 arrow for the normalization). The black line contour indicates the horizontal extent of the CO2 ice clouds (at the 1 g m−2 level). It is assumed here that the planets are endowed with a pure CO2 atmosphere and have with a surface that is entirely covered with CO2 ice. CO2 ice albedo is arbitrarily fixed at 0.5. We remind the reader that the radiative effect of CO2 ice clouds is not included here.
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