大陆硅酸盐风化的热力学和能量极限强烈影响潮湿岩石世界的气候和可居住性
Thermodynamic and Energetic Limits on Continental Silicate Weathering Strongly Impact the Climate and Habitability of Wet, Rocky Worlds
摘要：
“液态水宜居带“（HZ）概念是基于硅酸盐风化反馈稳定大范围星座气候的能力。然而，目前估计的HZ的有效外缘中使用的硅酸盐风化表示不占粘土沉淀径流中风化产物浓度的热力学限制，也不为行星星座设置的降水的能量限制。我们发现，当热力学极限包括在一个理想化的耦合气候/风化模型，稳态行星气候失去敏感性硅酸盐溶解动力学，成为敏感的温度，主要是通过温度对径流和pCO $_2$的影响，通过对溶质浓度的pH值介导的影响。这增加了敏感性土地分数，CO $_2$放气，以及地质因素如土壤年龄和岩性，所有这些都被发现有深刻的影响的位置的有效外缘的HZ。径流敏感性和降水的能量限制之间的相互作用导致新的温暖的状态在HZ的外部，由于温度和降水的解耦。我们讨论的战略，通过系外行星观测硅酸盐风化反馈的签名检测的见解来自修订后的图片风化。
英文摘要：
The "liquid water habitable zone" (HZ) concept is predicated on the ability of the silicate weathering feedback to stabilize climate across a wide range of instellations. However, representations of silicate weathering used in current estimates of the effective outer edge of the HZ do not account for the thermodynamic limit on concentration of weathering products in runoff set by clay precipitation, nor for the energetic limit on precipitation set by planetary instellation. We find that when the thermodynamic limit is included in an idealized coupled climate/weathering model, steady-state planetary climate loses sensitivity to silicate dissolution kinetics, becoming sensitive to temperature primarily through the effect of temperature on runoff and to pCO$_2$ through an effect on solute concentration mediated by pH. This increases sensitivity to land fraction, CO$_2$ outgassing, and geological factors such as soil age and lithology, all of which are found to have a profound effect on the position of the effective outer edge of the HZ. The interplay between runoff sensitivity and the energetic limit on precipitation leads to novel warm states in the outer reaches of the HZ, owing to the decoupling of temperature and precipitation. We discuss strategies for detecting the signature of silicate weathering feedback through exoplanet observations in light of insights derived from the revised picture of weathering.
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