3D Simulations of the Early Martian Hydrological Cycle Mediated by a H-2-CO2 Greenhouse

Guzewich, Scott D.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.;NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA. (author)

For decades, the scientific community has been trying to reconcile abundant evidence for fluvial activity on Noachian and early Hesperian Mars with the faint young Sun and reasonable constraints on ancient atmospheric pressure and composition. Recently, the investigation of H-2-CO2 collision-induced absorption has opened up a new avenue to warm Noachian Mars. We use the ROCKE-3D global climate model to simulate plausible states of the ancient Martian climate with this absorptive warming and reasonable constraints on surface paleopressure. We find that 1.5-2 bar CO2-dominated atmospheres with >= 3% H-2 can produce global mean surface temperatures above freezing, while also providing sufficient warming to avoid surface atmospheric CO2 condensation at 0 degrees-45 degrees obliquity. Simulations conducted with both modern topography and a paleotopography, before Tharsis formed, highlight the importance of Tharsis as a cold trap for water on the planet. Additionally, we find that low obliquity (modern and 0 degrees) is more conducive to rainfall over valley network locations than high (45 degrees) obliquity.

Way, Michael J.Uppsala universitet,Institutionen för fysik och astronomi,NASA, Goddard Inst Space Studies, New York, NY 10025 USA.;NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA.(Swepub:uu)micwa958 (author)
Aleinov, IgorNASA, Goddard Inst Space Studies, New York, NY 10025 USA.;NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA.;Columbia Univ, New York, NY USA. (author)
Wolf, Eric T.NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA.;Univ Colorado, Boulder, CO 80309 USA.;Univ Washington, Virtual Planetary Lab Team, NASA Nexus Exoplanet Syst Sci, Seattle, WA 98195 USA. (author)
Del Genio, AnthonyNASA, Goddard Inst Space Studies, New York, NY 10025 USA.;NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA. (author)
Wordsworth, RobinHarvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA. (author)
Tsigaridis, KostasNASA, Goddard Inst Space Studies, New York, NY 10025 USA.;NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA.;Columbia Univ, New York, NY USA. (author)
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.;NASA, GSFC Sellers Exoplanet Environm Collaborat, Greenbelt, MD 20771 USA.Institutionen för fysik och astronomi (creator_code:org_t)

In:Journal of Geophysical Research - Planets: American Geophysical Union (AGU)126:72169-90972169-9100

By the author/editor: Guzewich, Scott ...; Way, Michael J.; Aleinov, Igor; Wolf, Eric T.; Del Genio, Antho ...; Wordsworth, Robi ...; show more...; Tsigaridis, Kost ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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