Item
Pujol i SagarÃ³, Toni
Fort, Joaquim 

We investigate the hypothesis that the atmosphere is constrained to maximize its entropy production by using a onedimensional (1D) vertical model. We prescribe the lapse rate in the convective layer as that of the standard troposphere. The assumption that convection sustains a critical lapse rate was absent in previous studies, which focused on the vertical distribution of climatic variables, since such a convective adjustment reduces the degrees of freedom of the system and may prevent the application of the maximum entropy production (MEP) principle. This is not the case in the radiativeâ€“convective model (RCM) developed here, since we accept a discontinuity of temperatures at the surface similar to that adopted in many RCMs. For current conditions, the MEP state gives a difference between the ground temperature and the air temperature at the surface â‰ˆ10 K. In comparison, conventional RCMs obtain a discontinuity â‰ˆ2 K only. However, the surface boundary layer velocity in the MEP state appears reasonable (â‰ˆ3 m sÂ¹). Moreover, although the convective flux at the surface in MEP states is almost uniform in optically thick atmospheres, it reaches a maximum value for an optical thickness similar to current conditions. This additional result may support the maximum convection hypothesis suggested by Paltridge (1978)  
http://hdl.handle.net/2072/209936  
eng  
International Meteorological Institute in Stockholm  
AttributionNonCommercial 3.0 Spain  
http://creativecommons.org/licenses/bync/3.0/es/  
RadiaciÃ³ atmosfÃ¨rica
Atmospheric radiation Entropia Entropy TermodinÃ mica Thermodynamic 

States of maximum entropy production in a onedimensional vertical model with convective adjustment  
info:eurepo/semantics/article  
Recercat 