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arXiv 2012.10616astro-ph.EPphysics.ao-ph
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氧化早期火星上H $_2$ O $_2$引起的温室变暖

H$_2$O$_2$-induced Greenhouse Warming on Oxidized Early Mars

Yuichi Ito, George L. Hashimoto, Yoshiyuki O. Takahashi, Masaki Ishiwatari, Kiyoshi Kuramoto

摘要:

在火星早期的氧化环境中存在液态水,这是由最近的火星探索中发现的富锰岩石推断出来的。富锰岩石所暗示的氧化气氛基本上由CO $_2$和H $_2$ O组成,没有任何还原的温室气体,如H $_2$和CH $_4$。然而,到目前为止,人们一直认为,如果没有减少温室气体的存在,早期的火星不可能足够温暖,以维持液态水的存在。在这里,我们提出H $_2$ O $_2$可能是负责加热氧化早期火星表面的气体。我们的一维大气模型表明,只有1 ppm的H $_2$ O $_2$就足以使行星表面变暖,因为它对远红外波长有很强的吸收,其中对于压力为3 bar的CO $_2$大气,地面温度可能达到273 K以上。由于在缓慢凝结条件下的快速光化学生成,潮湿和氧化的大气层预计将在其高层大气中保持足够量的H $_2$ O $_2$气体。我们的研究结果表明,在氧化的早期火星上可能保持着温暖潮湿的环境,从而表明其古老的大气氧化还原状态和可能的水环境之间可能存在联系。

英文摘要:

The existence of liquid water within an oxidized environment on early Mars has been inferred by the Mn-rich rocks found during recent explorations on Mars. The oxidized atmosphere implied by the Mn-rich rocks would basically be comprised of CO$_2$ and H$_2$O without any reduced greenhouse gases such as H$_2$ and CH$_4$. So far, however, it has been thought that early Mars could not have been warm enough to sustain water in liquid form without the presence of reduced greenhouse gases. Here, we propose that H$_2$O$_2$ could have been the gas responsible for warming the surface of the oxidized early Mars. Our one-dimensional atmospheric model shows that only 1 ppm of H$_2$O$_2$ is enough to warm the planetary surface because of its strong absorption at far-infrared wavelengths, in which the surface temperature could have reached over 273~K for a CO$_2$ atmosphere with a pressure of 3~bar. A wet and oxidized atmosphere is expected to maintain sufficient quantities of H$_2$O$_2$ gas in its upper atmosphere due to its rapid photochemical production in slow condensation conditions. Our results demonstrate that a warm and wet environment could have been maintained on an oxidized early Mars, thereby suggesting that there may be connections between its ancient atmospheric redox state and possible aqueous environment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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