The available models of global climate evolution in habitable earthlike planets do not consider the effect of salt content in oceans, which affects water evaporation. Two distinct categories of such planets are considered in this work: planets with deep oceans, but with intrinsically high salinities due to the weaker salt removal process by hydrothermal vents; and planets with shallow oceans, where the increase in salt content and decrease in ocean area during the onset of glaciation cause a measurable negative feedback on perturbations, helping delay the onset of ice ages. We developed a toy climate model of a habitable planet on the verge of an ice age, using a range of initial salt concentrations. For planets with deep oceans and high salinity we find a considerable decrease in land ice sheet growth rate, up to ~ 23% considering the maximum salinity range. For planets with shallow oceans, the effect of intrinsic high salinity previously modelled is reinforced by the negative feedback, to the point of effectively terminating the land ice sheet growth rate during the time-scale of the simulations. We also investigate the application of this model to the putative ocean of early Mars, and find that the results lie in between the two categories. We conclude that this new phenomenon, which can be viewed as an abiotic self-regulation process against ice ages, should be taken into account in studies of habitable planets smaller and drier than the Earth, which may well represent the bulk of habitable planets.

中文翻译：

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最常见的宜居行星 II - 低质量宜居行星中的咸海和全球气候演变

可居住的类地行星全球气候演化的可用模型没有考虑海洋中盐分含量的影响，这会影响水的蒸发。在这项工作中考虑了两种不同类别的此类行星：具有深海的行星，但由于热液喷口的脱盐过程较弱，因此具有固有的高盐度；和具有浅海的行星，在冰河期开始期间盐分含量的增加和海洋面积的减少会导致对扰动的可测量负反馈，从而有助于延迟冰河时代的开始。我们使用一系列初始盐浓度开发了一个处于冰河时代边缘的宜居行星的玩具气候模型。对于深海和高盐度的行星，我们发现陆地冰盖增长率显着下降，考虑到最大盐度范围，高达 ~ 23%。对于具有浅海的行星，先前模拟的固有高盐度的影响被负反馈加强，以至于在模拟的时间尺度内有效地终止了陆地冰盖的增长率。我们还研究了该模型在早期火星假定海洋中的应用，并发现结果介于两类之间。我们得出的结论是，这种新现象可以被视为对抗冰河时代的非生物自我调节过程，应该在对比地球更小、更干燥的宜居行星的研究中加以考虑，这些行星很可能代表了大部分宜居行星。到在模拟的时间尺度内有效终止陆地冰盖增长率的地步。我们还研究了该模型在早期火星假定海洋中的应用，并发现结果介于两类之间。我们得出的结论是，这种新现象可以被视为对抗冰河时代的非生物自我调节过程，应该在对比地球更小、更干燥的宜居行星的研究中加以考虑，这些行星很可能代表了大部分宜居行星。到在模拟的时间尺度内有效终止陆地冰盖增长率的地步。我们还研究了该模型在早期火星假定海洋中的应用，并发现结果介于两类之间。我们得出的结论是，这种新现象可以被视为对抗冰河时代的非生物自我调节过程，应该在对比地球更小、更干燥的宜居行星的研究中加以考虑，这些行星很可能代表了大部分宜居行星。