Department of Meteorology, The Pennsylvania State University, University Park, USA.
Astrobiology. 2012 Jun;12(6):562-71. doi: 10.1089/ast.2011.0762. Epub 2012 Jul 9.
Atmospheric gaseous constituents play an important role in determining the surface temperatures and habitability of a planet. Using a global climate model and a parameterization of the carbonate-silicate cycle, we explored the effect of the location of the substellar point on the atmospheric CO(2) concentration and temperatures of a tidally locked terrestrial planet, using the present Earth continental distribution as an example. We found that the substellar point's location relative to the continents is an important factor in determining weathering and the equilibrium atmospheric CO(2) level. Placing the substellar point over the Atlantic Ocean results in an atmospheric CO(2) concentration of 7 ppmv and a global mean surface air temperature of 247 K, making ∼30% of the planet's surface habitable, whereas placing it over the Pacific Ocean results in a CO(2) concentration of 60,311 ppmv and a global temperature of 282 K, making ∼55% of the surface habitable.
大气气态成分在确定行星的表面温度和宜居性方面起着重要作用。我们使用一个全球气候模型和碳酸盐-硅酸盐循环的参数化，以目前地球大陆的分布为例，探讨了亚恒星点的位置对一个潮汐锁定的类地行星的大气 CO2 浓度和温度的影响。我们发现，相对于大陆的亚恒星点的位置是决定风化和平衡大气 CO2 水平的一个重要因素。将亚恒星点置于大西洋上方会导致大气 CO2 浓度为 7ppmv 和全球平均表面空气温度为 247K，使大约 30%的行星表面适宜居住，而将其置于太平洋上方则会导致 CO2 浓度为 60311ppmv 和全球温度为 282K，使大约 55%的表面适宜居住。
