A general circulation model study of the effects of faster rotation rate, enhanced CO2 concentration, and reduced solar forcing: implications for the faint young Sun paradox

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The control simulation of this study has a solar constant reduced by 10% the present amount, zero land fraction using a swamp ocean surface, CO2 concentrations of 330 ppmv, present-day rotation rate, and is integrated under mean diurnal and seasonal solar forcing. Four sensitivity tests are performed under zero land fraction and reduced solar constant conditions: 1) increased rotation rate, 2) 8 times present CO2, 3) a combination of 1 and 2, and 4) 3 with a 15% reduction in the solar constant. Results indicate the following changes in the global mean sea surface temperatures (SSTs) compared to the control simulation: 1) +6.6 K, 2) +12 K, 3) +18.5 K, and 4) +6.6 K relative to the control's global mean temperature of 264.7 K. Sea ice is confined to higher latitudes in each experiment compared to the control, with ice-free areas equatorward of the subtropics. The warm SSTs are associated with a 20% reduction in clouds for the rotation rate experiments and higher CO2 concentrations in the other experiments. -from Author

Original languageEnglish (US)
Pages (from-to)20,803-20,811
JournalJournal of Geophysical Research
Issue numberD11
Publication statusPublished - Jan 1 1993


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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