High-obliquity simulations for the Archean Earth: Implications for climatic conditions on early Mars

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Abstract

Global climate model simulations using high-obliquity (70°), higher CO2 and CH4 but reduced O3 concentrations produce warm climate conditions for Archean boundary conditions (reduced solar forcing). Solar radiation under high-obliquity is distribution in such a way as to warm high latitudes and cool low-latitudes. Global mean air temperatures of approximately 280°K are found with a 25% reduction in the solar forcing, 4760 ppmv CO2 and 25 ppmv CH4. High-obliquity could also explain why polar oceans on Mars may have occurred in its history. A substantial increase in the amount of insolation is accounted for if Mars had an obliquity of 70°.

Original languageEnglish (US)
Article number2000JE001427
Pages (from-to)32903-32913
Number of pages11
JournalJournal of Geophysical Research E: Planets
Volume106
Issue numberE12
DOIs
StatePublished - Dec 25 2001

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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