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. 2021 Feb 3;7(6):eabe4459. doi: 10.1126/sciadv.abe4459

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Fig. 5 — (A) Gypsum solubility was calculated for variable concentrations of chlorides and perchlorates. The vertical red bar marks typical Cl concentrations in martian surface fines. Gypsum solubility for Ca(ClO₄)₂ is similar to that of CaCl₂. (B) Temperatures of metastable partially liquid Cl salts (gray arrows) compared to the mean annual temperature of Mars, the mean diurnal temperature, and the maximum and minimum diurnal temperatures, which are warmest in late spring and early summer [modified from Toner et al. (58)]. Only Mg and Ca perchlorates would be partially liquid all year round on Mars.