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H2O2-induced Greenhouse Warming on Oxidized Early Mars

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Title: H2O2-induced Greenhouse Warming on Oxidized Early Mars
Authors: Ito, Yuichi Browse this author
Hashimoto, George L. Browse this author
Takahashi, Yoshiyuki O. Browse this author
Ishiwatari, Masaki Browse this author →KAKEN DB
Kuramoto, Kiyoshi Browse this author →KAKEN DB
Keywords: Inner planets
Planetary atmospheres
Issue Date: 20-Apr-2020
Publisher: IOP Publishing
Journal Title: Astrophysical journal
Volume: 893
Issue: 2
Start Page: 168
Publisher DOI: 10.3847/1538-4357/ab7db4
Abstract: 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 CO2 and H2O without any reduced greenhouse gases such as H-2 and CH4. 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 H2O2 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 H2O2 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 CO2 atmosphere with a pressure of 3 bar. A wet and oxidized atmosphere is expected to maintain sufficient quantities of H2O2 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.
Rights: This is the Accepted Manuscript version of an article accepted for publication in Astrophysical journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 倉本 圭

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