The paper (and several others cited by the paper) corroborates the underlying physical assumptions of the Maxwell/Carnot/Clausius atmospheric mass/gravity/pressure theory of the 33C greenhouse effect and the 'greenhouse equation.'
The conventional CAGW radiative greenhouse theory assumes greenhouse gas backradiation from the lower temperature/frequency/energy atmosphere is capable of warming by 33C the higher temperature/frequency/energy Earth surface. The 2nd law of thermodynamics requires heat to flow one-way only from hot to cold, and total system entropy to increase to the maximum potential extent. However, net heat flow from a cold atmosphere necessary warm the hot Earth surface by 33C would require an impossible decrease of total system entropy, forbidden by the 2nd law and principle of maximum entropy production. Although radiation between hot and cold bodies is bidirectional, the 2nd law only permits heat to flow one-way from a higher temperature/frequency/energy body to a lower temperature/frequency/energy body.
As Dr. Judith Curry noted in regard to another related paper on the second law principle of maximum entropy production and climate,
JC comments: The 2nd law of thermodynamics is an underutilized piece of physics in climate science. It is not a simple beast to wrestle with, but I think there are some important insights to gain. Optimality, self-organizing criticality, and nonlinearity are factors that are not adequately accounted for in traditional climate feedback analyses, and an entropy-based framework would be more consistent with the climate shifts that are actually observed.Inspired by the famous engineer/physicist Carnot's description of the atmosphere as a heat engine (which also forms the basis of the Maxwell/Carnot/Clausius atmospheric mass/gravity/pressure theory of the 33C greenhouse effect), the authors develop an Earth energy and entropy budget and simple climate model on the basis of the second law of thermodynamics and principle of maximum entropy production (MEP).
"The opening words of Carnot s original treatise on thermodynamics provide a good starting point for this review paper. We consider that Carnot 's view contains invaluable insight into the subject, which seems to have been lost from our contemporary view of the world. Carnot regarded the Earth as a sort of heat engine, in which a fluid like the atmosphere acts as working substance transporting heat from hot to cold places, thereby producing the kinetic energy of the fluid itself. His general conclusion about heat engines is that there is a certain limit for the conversion rate of the heat energy into the kinetic energy and that this limit is inevitable for any natural systems including, among others, the Earth s atmosphere. His suggestion on the atmospheric heat engine has been rather ignored. It is the purpose of this paper to reexamine Carnot s view, as far as possible, by reviewing works so far published in the fields of fluid dynamics, Earth sciences, and nonequilibrium thermodynamics."As illustrated in Fig 5 below, the author's entropy & energy budget shows heat flows one-way only from hot to cold, and there are no terms for greenhouse gases, backradiation, or radiative forcing from greenhouse gases incorporated anywhere in the author's energy and entropy budget calculations. The author's energy budget is in stark contrast to Trenberth's energy budget showing 333 W/m2 of greenhouse gas backradiation from the cold atmosphere heating the Earth surface (alleged to be more than double the radiative input from the Sun absorbed at the Earth surface [161 W/m2]).
On the basis of this simple energy/entropy model assuming maximum entropy production (and no warming or radiative forcing from greenhouse gases), the authors find a remarkable agreement between modeled and observed temperatures, fractional cloud cover, and meridional heat flux from the equator to the poles:
|Introduction citing the work of Carnot|
|Modeled results agree closely with observed temperatures, cloud cover, and heat flux.|
|The authors also find their model explains the atmospheric temperature profiles of other planets (with vastly different greenhouse gas compositions) including Titan and Mars.|
The second law of thermodynamics and the global climate system: A review of the maximum entropy production principle
Hisashi Ozawa, Atsumu Ohmura, Ralph D. Lorenz and Toni Pujol
 The long-term mean properties of the global climate system and those of turbulent fluid systems are reviewed from a thermodynamic viewpoint. Two general expressions are derived for a rate of entropy production due to thermal and viscous dissipation (turbulent dissipation) in a fluid system. It is shown with these expressions that maximum entropy production in the Earth's climate system suggested by Paltridge, as well as maximum transport properties of heat or momentum in a turbulent system suggested by Malkus and Busse, correspond to a state in which the rate of entropy production due to the turbulent dissipation is at a maximum. Entropy production due to absorption of solar radiation in the climate system is found to be irrelevant to the maximized properties associated with turbulence. The hypothesis of maximum entropy production also seems to be applicable to the planetary atmospheres of Mars and Titan and perhaps to mantle convection. Lorenz's conjecture on maximum generation of available potential energy is shown to be akin to this hypothesis with a few minor approximations. A possible mechanism by which turbulent fluid systems adjust themselves to the states of maximum entropy production is presented as a self-feedback mechanism for the generation of available potential energy. These results tend to support the hypothesis of maximum entropy production that underlies a wide variety of nonlinear fluid systems, including our planet as well as other planets and stars.
A new & related paper finds global wind energetics are well explained by the principle of maximum entropy production.