Talk:Greenhouse effect

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Greenhouse Effect problems[change source]

The radiative greenhouse effect conjecture is demolished by the Loschmidt gravito-thermal effect which is clearly evident in a Ranque-Hilsch Vortex tube for example, as well as in all planetary tropospheres.

It is wrong to assume Loschmidt's gravitationally induced thermal gradient does not evolve spontaneously in a gravitational field. It is the isentropic state of maximum entropy with no further unbalanced energy potentials. You cannot explain why the Venus surface temperature rises by 5 degrees spread over the course of its 4-month-long day with any radiative forcing conjecture or greenhouse philosophy. The Venus surface receives barely 10% of the direct Solar radiation that Earth's surface receives. It would need over 16200 W/m^2 if radiation were heating the surface. Then, during sunlit hours it would need an extra 450W/m^2 to raise the temperature from about 732K to 737K. On Earth, if isothermal conditions were supposedly existing without water vapor and other greenhouse gases, then the sensitivity to water vapor would be about 10 degrees per 1% atmospheric content. But there is no evidence that a region with 1% above it is 30 degrees colder than another region at similar altitude and latitude with 4% above it. The effective surface layer of Earth's oceans may be considered to be only 1cm thick, or even if 10cm thick it is still very transparent to insolation. But a black or grey body does not transmit radiation, and the surface layer absorbs less than 1% of that incident solar radiation. So the S-B calculations are totally incorrect and planetary surface temperatures cannot be calculated using such.

This is where the error crept in in 1985 [1] ...

"Coombes and Laue concluded that answer (1) is the correct one and answer (2) is wrong. They reached this conclusion after finding that statement (2a) is wrong, i.e., the average kinetic energy of all molecules does not decrease with the height even though the kinetic energy of each individual molecule does decrease with height.

These authors give at first a qualitative explanation of this fact by noting that since both the kinetic energy of the molecules and the number density of molecules decrease with height, the average molecular kinetic energy does not necessarily decrease with height."

This is absurd. They had the mean kinetic energy decreasing in each molecule, but then they divided again by the number. Try calculating a mean by dividing twice by the number of elements. A glaring error. The Loschmidt effect has NOT been debunked by this nonsense.

Nor has the Loschmidt (or gravito-thermal) effect been debunked by Verkley et al [2] because they made the mistake of working with enthalpy, rather than entropy, which is all that the Second Law of Thermodynamics refers to. An isothermal state would have unbalanced energy potentials in a vertical plane because it would have more mean gravitational potential energy per molecule at the top. Hence it is not the state of thermodynamic equilibrium with maximum entropy.

A good example of the gravito-thermal effect can be found in the nominal Uranus troposphere where the base is hotter than Earth's surface despite there being no significant direct solar radiation or internal energy source, or any surface. The thermal gradient in the Uranus troposphere works out to be very close indeed to the negative quotient of the acceleration due to gravity on that planet and the weighted mean specific heat of the gases in the troposphere.

[1] Velasco, S., Román, F.L., White, J.A. (1996). On a paradox concerning the temperature distribution of an ideal gas in a gravitational field, Eur. J. Phys., 17: 43–44.

[2] W.T.M.Verkley et al "On Maximum Entropy Profiles"

Douglas Cotton (talk) 02:28, 1 April 2014 (UTC)[reply]


Other comments and questions[change source]

Is the comment saying, "The Greenhouse effect is not the same as the effect that warms a greenhouse" true, or just vandalism?

I'm pretty sure it is the same as the effect that warms a greenhouse: a greenhouse is warmed by reflecting heat back inside, as do greenhouse gases. It's just vandalism. 02:35, 13 June 2007 (UTC)[reply]

It is not vandalism; greenhouses work by trapping air, preventing it from rising out of the greenhouse via convection. A greenhouse gas works by absorbing infrared radiation from the Earth's surface, and re-emitting back towards the earth.

Read the regular English wiki on the subject if you're still unsure...--Dawei20 (talk) 06:01, 15 December 2008 (UTC)[reply]