论文标题
碳酸盐硅酸盐周期预测类似地球的行星气候并测试可居住区概念
Carbonate-Silicate Cycle Predictions of Earth-like Planetary Climates and Testing the Habitable Zone Concept
论文作者
论文摘要
在常规宜居区（Hz）概念中，Co $ _ {2} $ - H $ _2 $ o Greenhouse维持地面液态水。通过水介导的碳酸盐 - 硅酸盐风化周期，大气中心$ _ {2} $部分压（PCO $ _ {2} $）对表面温度的变化做出了反应，从而使地质时间尺度上的气候稳定了。我们表明，这种风化的反馈应该在Hz中的pco $ _ {2} $和类似地球的行星上的事件通量之间产生对数线性关系。但是，这种趋势之所以散射，是因为地球物理和物理化学参数可能会有所不同，例如用于风化的土地面积和CO $ _2 $耗尽通量。使用耦合的气候和碳酸盐 - 硅酸盐风化模型，我们在整个Hz中量化了PCO $ _2 $中的可能散射。从这种分散体中，我们预测HZ中的事件通量与PCO $ _2 $之间存在二维关系，并表明可以从至少83（$2σ$）地球样系外行星观测中检测到它。如果观察到较少的地球样系外行星，则很难从这种关系中检验Hz假设。
In the conventional habitable zone (HZ) concept, a CO$_{2}$-H$_2$O greenhouse maintains surface liquid water. Through the water-mediated carbonate-silicate weathering cycle, atmospheric CO$_{2}$ partial pressure (pCO$_{2}$) responds to changes in surface temperature, stabilizing the climate over geologic timescales. We show that this weathering feedback ought to produce a log-linear relationship between pCO$_{2}$ and incident flux on Earth-like planets in the HZ. However, this trend has scatter because geophysical and physicochemical parameters can vary, such as land area for weathering and CO$_2$ outgassing fluxes. Using a coupled climate and carbonate-silicate weathering model, we quantify the likely scatter in pCO$_2$ with orbital distance throughout the HZ. From this dispersion, we predict a two-dimensional relationship between incident flux and pCO$_2$ in the HZ and show that it could be detected from at least 83 ($2σ$) Earth-like exoplanet observations. If fewer Earth-like exoplanets are observed, testing the HZ hypothesis from this relationship could be difficult.
