The early Martian atmosphere: Investigating the role of the dust cycle in the possible maintenance of two stable climate states
The early Martian atmosphere: Investigating the role of the dust cycle in the possible maintenance of two stable climate states
复制标题
早期火星大气：研究尘埃循环在可能维持两种稳定气候状态中的作用
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
J. Hollingsworth
中科院分区：
文献类型：
--
作者：
M. Kahre;S. Vines;R. Haberle;J. Hollingsworth
C. Leovy（个人通讯，2007）推测，早期火星上的两种稳定气候状态可能是由尘埃和二氧化碳循环之间的相互作用造成的。在一种状态下，一个高度活跃的尘埃循环将阻止大气崩溃，而在第二种状态下，崩溃的大气将无法维持活跃的尘埃循环。初步评估这一想法的基础上提出的火星大气环流模型参数的研究。研究了一系列全球尘埃负荷、CO2冰反照率和倾角，以探索增加大气尘埃含量可以稳定不稳定大气的条件。我们发现，尘埃只稳定大气在高湿度和当CO2冰的CO2浓度高。虽然结果表明，在有限的条件下，早期火星上可能存在两种稳定状态，但需要进一步的工作来了解必要的条件是否物理上合理。
C. Leovy (personal communication, 2007) speculated that two stable climate states on early Mars could have resulted from interactions between the dust and CO2 cycles. In one state, a highly active dust cycle would prevent atmospheric collapse, and in the second, the collapsed atmosphere would not maintain an active dust cycle. An initial assessment of this idea is presented based on a Mars general circulation model parameter study. A range of global dust loadings, CO2 ice albedos, and obliquities are investigated to explore conditions in which increasing the atmospheric dust content stabilizes an otherwise unstable atmosphere. We find that dust only stabilizes the atmosphere at high obliquity and when the CO2 ice albedo is high. Although results suggest that two stable states could have existed on early Mars under limited conditions, further work is needed to know if the conditions necessary are physically plausible.