论文标题
更改水流图的空间分布，火星温室效应的重大变化
Changing spatial distribution of water flow charts major change in Mars' greenhouse effect
论文作者
论文摘要
火星早期有河流，但是火星湿干燥过渡的原因仍然未知。可以使用对气候敏感地形的空间分布来探测火星上的过去气候。我们分析了供水地形的全球数据库，并确定了随着时间的推移河流空间分布的变化。这些变化仅与由全球气候模型模拟集合驱动的简化融化模型进行了比较，这是由于全球平均表面温度（t）$ \ ge $ 268 k至t $ \ sim $ 258 K的结果，这是由于较弱的绿化室效应。换句话说，火星早期的河流气候首先温暖而潮湿，以后寒冷又潮湿。令人惊讶的是，我们全球气候模型仿真集合中对温室效应的分析表明，这种转变主要是由非CO2辐射强迫降低而驱动的，而不是CO2辐射强迫的变化。
Early Mars had rivers, but the cause of Mars' wet-to-dry transition remains unknown. Past climate on Mars can be probed using the spatial distribution of climate-sensitive landforms. We analyzed global databases of water-worked landforms and identified changes in the spatial distribution of rivers over time. These changes are simply explained by comparison to a simplified meltwater model driven by an ensemble of global climate model simulations, as the result of $\gtrsim$10 K global cooling, from global average surface temperature (T) $\ge$ 268 K to T $\sim$ 258 K, due to a weaker greenhouse effect. In other words, river-forming climates on Early Mars were warm and wet first, and cold and wet later. Surprisingly, analysis of the greenhouse effect within our ensemble of global climate model simulations suggests that this shift was primarily driven by waning non-CO2 radiative forcing, and not changes in CO2 radiative forcing.
