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LJWorld.com weblogs Science Becoming Religion

Global Warming Greenhouse Theory Disproved a Century Ago

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The claim that carbon dioxide (CO2) can increase air temperatures by "trapping" infrared radiation (IR) ignores the fact that in 1909 physicist R.W. Wood disproved the popular 19th Century thesis that greenhouses stayed warm by trapping IR. Unfortunately, many people who claim to be scientists are unaware of Wood's experiment which was originally published in the Philosophical magazine , 1909, vol 17, p319-320.

Philosophical Magazine might not sound like the name of a science publication, but a century ago leading scientists published their discoveries in it.

During the early 19th Century many physicists supported the theory postulated by Benjamin Franklin that heat involved some type of fluid. The theory became known as "caloric theory". Joseph Jean Baptiste Fourier's theory that the atmosphere was heated from infrared radiation from the ground was a variation of caloric theory with IR functioning as the "fluid". Fourier believed greenhouses were heated by trapping this radiation.

Physicists in the early 19th Century were attempting to develop theories to explain the nature of atoms and their properties such as heat. Physicists theorized that atoms were the smallest particles of matter.

By the end of the century a new theory of heat, called "kinetic theory", was being developed that suggested heat was the motion, or kinetic energy, of atoms. However, Fourier's theory that IR heated the atmosphere particularly by interacting with carbon dioxide and water vapor continued to have support.

In 1897 J.J. Thompson overturned the popular theory of the atoms being the smallest particles of matter by reporting his discovery of the electron and predicting two other types of charged particles he called protons and neutrons.

Wood was an expert on IR. His accomplishments included inventing both IR and UV (ultraviolet) photography. In 1909 he decided to test Fourier's theory about how greenhouses retained heat.

Wood constructed two identical small greenhouses. The description implies the type of structure a gardener would refer to as a "cold frame" rather than a building a person could walk into.

He lined the interior with black cardboard which would absorb radiation and convert it to heat which would heat the air through conduction. The cardboard would also produce radiation. He covered one greenhouse with a sheet of transparent rock salt and the other with a sheet of glass. The glass would block IR and the rock salt would allow it to pass.

During the first run of the experiment the rock salt greenhouse heated faster due to IR from the sun entering it but not the glass greenhouse. He then set up another pane of glass to filter the IR from the sun before the light reached the greenhouses.

The result from this run was that the greenhouses both heated to about 50 C with less than a degree difference between the two. Wood didn't indicate which was warmer or whether there was any difference in the thermal conductivity between the glass sheet and the rock salt. A slight difference in the amount of heat transfered through the sheets by conduction could explain such a minor difference in temperature. The two sheets probably didn't conduct heat at the same rate.

The experiment conclusively demonstrates that greenhouses heat up and stay warm by confining heated air rather than by trapping IR. If trapping IR in an enclosed space doesn't cause higher air temperature than CO2 in the atmosphere cannot cause higher air temperatures.

The heated air in the greenhouses couldn't rise higher than the sheets that covered the tops of the greenhouses. Heated air outside is free to rise allowing colder air to fall to the ground.

Atmospheric CO2 is even less likely to function as a barrier to IR or reflect it back to reheat the ground or water than the sheet of glass in Wood's greenhouse.

The blackened cardboard in Wood's greenhouses was a very good radiator of IR as is typical of black substances. The water that covers 70% of earth's surface is a very poor radiator and produces only limited amounts of IR as is typical of transparent substances. Water releases heat through evaporation rather than radiation.

The glass sheet provided a solid barrier to IR. Atmospheric CO2 is widely dispersed comprising less than 400 parts per million in the atmosphere. Trapping IR with CO2 would be like trying to confine mice with a chain link fence.

Glass reflects a wider spectrum of IR than interacts with CO2. The glass sheets reflected IR back toward the floor of the greenhouse. CO2 doesn't reflect IR.

At the time of Wood's experiment, it was believed that CO2 and other gas molecules became hotter after absorbing IR.

Four years later Niels Bohr reported his discovery that the absorption of specific wavelengths of light didn't cause gas atoms/molecules to become hotter. Instead, the absorption of specific wavelengths of light caused the electrons in an atom/molecule to move to a higher energy state. After absorption of light of a specific wavelength an atom couldn't absorb additional radiation of that wavelength without first emitting light of that wavelength. He called the amount of energy absorbed and emitted as a "quantum". (Philosophical Magazine Series 6, Volume 26 July 1913, p. 1-25)

Unlike the glass which reflects IR back where it comes from, CO2 molecules emit IR up and sideways as well as down. In the time interval between absorbing and reemitting radiation, CO2 molecules allow IR to pass them by. Glass continuously reflects IR.

Those who claim that CO2 molecules in the atmosphere can cause heating by trapping IR have yet to provide any empirical scientific evidence to prove such a physical process exists. The experiment by R.W. Wood demonstrates that even a highly reflective covering that reflects a broad spectrum of IR cannot cause heating by trapping IR in a confined space. There is no way CO2, which at best only affects a small portion of the IR produced by earth's surface, can heat the atmosphere by trapping IR.

Contrary to the lie repeated in news stories about climate, science doesn't say that CO2 is causing higher temperatures by trapping IR. Empirical science indicates that no such process exists in this physical universe.

Comments

bondmen 1 year, 11 months ago

Evolutionists believe in ice ages and Creationists in an ice age but today most of the ice is gone yet the warm up occurred before men burned hydrocarbons in abundance. The sun is the engine of warmth on earth sans an occasional earthly volcano. Global Warming is about people control and raising tax revenues pure and simple and the sooner we understand this the better off future generations of Americans will be. Don't let government define science and tinker with the real world as they've proven inept at best and corrupt to the core at worst and only their interests and those of their politically and economically connected allies matters.

Hopsgegangen 1 year, 11 months ago

Climatologists would actually talk about "radiative forcing" -- the greenhouse analogy is just a way for lay people to think about it. As you point out, CO2 reflects infrared in all directions, but because that wavelength is where Earth dissipates energy from absorbed visible light, additional CO2 increases the forcing. It's a very small amount, a watt or so per square meter, but it just adds up over time as land and oceans warm up.

People who are serious about the science may want to check the work of Richard Muller, a former skeptic. He analyzed the data very carefully and concluded that (1) there is a warming trend, (2) the trend matches CO2 levels, (3) the CO2 is from fossil fuels, and (4) solar radiation does not match the warming trend. He didn't use an computer models or theories either.

But no, bondsmen, this is not about government control. This is about a slowly unfolding disaster. Once we put the CO2 into the air, we have no way to get it out. If those who deny there is a problem get in the way of solving it and turn out to be wrong, there is no way to fix it.. People who love their children should not experiment with the atmosphere. If nothing else, the drought in the U.S. and the heat wave in Australia should show us how powerless we are if the climate changes.

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