GCM Simulations of Unstable Climates in the Habitable Zone
GCM Simulations of Unstable Climates in the Habitable Zone
复制标题
GCM 对宜居带不稳定气候的模拟
DOI：
10.3847/1538-4357/aa8b1c
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
K. Menou
中科院分区：
文献类型：
--
作者：
A. Paradise;K. Menou
最近有人提出，在宜居带外围地区的类地行星经历着不稳定的气候，在冰川和冰川消融的气候状态之间反复循环。虽然这一结果已被证实，并扩展到解释早期火星气候记录，但所有现有的工作都依赖于高度理想化的低维气候模型。在这里，我们证实了气候周期的现象学仍然存在于三维地球气候模型中，具有相当大的自由度。为了避免在Gyr时间尺度上积分气候的计算障碍，我们实现了一个混合0D-3D积分器，该积分器使用一般环流模式（GCM）作为长演化气候序列的短松弛步骤。我们发现，GCM气候周期在质量上与报道的低维结果一致。这建立了一个更坚实的基础，即外适居带行星可能优先发现于短暂的冰川状态。
It has recently been proposed that Earth-like planets in the outer regions of the habitable zone experience unstable climates, repeatedly cycling between glaciated and deglaciated climatic states. While this result has been confirmed and also extended to explain early Mars climate records, all existing work relies on highly idealized low-dimensional climate models. Here, we confirm that the phenomenology of climate cycles remains in 3D Earth climate models with considerably more degrees of freedom. To circumvent the computational barrier of integrating climate on Gyr timescales, we implement a hybrid 0D-3D integrator that uses a general circulation model (GCM) as a short relaxation step along a long evolutionary climate sequence. We find that GCM climate cycles are qualitatively consistent with reported low-dimensional results. This establishes on a firmer ground the notion that outer habitable zone planets may be preferentially found in transiently glaciated states.
影响因子：
1.2
作者：
Fraedrich, K;Jansen, H;Lunkeit, F
通讯作者：
Lunkeit, F