For decades, the scientific community has been trying to reconcile abundant evidence for fluvial activity on Noachian and early Hesperian Mars with the faint young Sun and reasonable constraints on ancient atmospheric pressure and composition. Recently, the investigation of H₂-CO₂ collision-induced absorption has opened up a new avenue to warm Noachian Mars. We use the ROCKE-3D global climate model to simulate plausible states of the ancient Martian climate with this absorptive warming and reasonable constraints on surface paleopressure. We find that 1.5–2 bar CO₂-dominated atmospheres with ≥3% H₂ can produce global mean surface temperatures above freezing, while also providing sufficient warming to avoid surface atmospheric CO₂ condensation at 0°–45° obliquity. Simulations conducted with both modern topography and a paleotopography, before Tharsis formed, highlight the importance of Tharsis as a cold trap for water on the planet. Additionally, we find that low obliquity (modern and 0°) is more conducive to rainfall over valley network locations than high (45°) obliquity.

中文翻译：

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由 H2-CO2 温室介导的早期火星水文循环的 3D 模拟

几十年来，科学界一直试图将诺亚纪和西伯利亚早期火星上河流活动的大量证据与微弱的年轻太阳以及古代大气压力和成分的合理限制相协调。最近，H ₂ -CO ₂碰撞诱导吸收的研究开辟了一条新的途径来加热诺亚火星。我们使用 ROCKE-3D 全球气候模型来模拟具有这种吸收性变暖和对地表古压力的合理限制的古火星气候的合理状态。我们发现 1.5–2 bar CO ₂主导的大气与≥3% H ₂可以产生高于冰点的全球平均地表温度，同时也提供足够的变暖以避免地表大气 CO₂ 0°–45° 倾角处的冷凝。在 Tharsis 形成之前，使用现代地形和古地形进行的模拟突出了 Tharsis 作为地球上水冷阱的重要性。此外，我们发现低倾角（现代和 0°）比高倾角（45°）更有利于山谷网络位置的降雨。