CO2 condensation and the climate of early Mars.
CO2 condensation and the climate of early Mars.
复制标题
二氧化碳凝结和早期火星的气候。
DOI：
10.1016/0019-1035(91)90137-i
复制
发表时间：
1991
期刊：
影响因子：
3.2
通讯作者：
J. Kasting
中科院分区：
文献类型：
--
作者：
J. Kasting
一个一维的辐射对流气候模型被用来重新研究早期火星是否可以通过稠密的二氧化碳大气的温室效应保持温暖的问题。新模型与以往模型不同之处在于考虑了CO2云对对流直减率和行星辐射收支的影响。CO2的凝结降低了直减率，从而降低了温室效应的幅度。这一现象在太阳光度较低时变得越来越重要，并且可能排除了220亿年前的温暖（0°C），全球平均表面温度，除非除了CO2和H2O之外还有其他温室气体存在。讨论了早期火星变暖和解释通道形成的替代机制。
A one-dimensional, radiative-convective climate model was used to reexamine the question of whether early Mars could have been kept warm by the greenhouse effect of a dense, CO2atmosphere. The new model differs from previous models by considering the influence of CO2clouds on the convective lapse rate and on the planetary radiation budget. Condensation of CO2decreases the lapse rate and, hence, reduces the magnitude of the greenhouse effect. This phenomenon becomes increasingly important at low solar luminosities and may preclude warm (0°C), globally averaged surface temperatures prior to ∼2 billion years ago unless other greenhouse gases were present in addition to CO2and H2O. Alternative mechanisms for warming early Mars and explaining channel formation are discussed.