By R. M. Goody, Y. L. Yung
An entire revision of Goody's vintage 1964 paintings, this quantity bargains a scientific dialogue of atmospheric radiation strategies that this present day are on the heart of globally learn and predicament. It bargains with the ways that incident sunlight radiation is reworked into scattered and thermal radiation, and the thermodynamic results for the Earth's gaseous envelope, making a choice on points of the interplay among radiation and atmospheric motions because the vital subject for atmospheric radiation reviews. As a whole therapy of actual and mathematical foundations, the textual content assumes no past wisdom of atmospheric physics. The theoretical dialogue is systematic, and will hence be utilized with minor extension to any planetary surroundings.
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The Planck function. The curve with ordinate ABA gives areas proportional to energies. 4% of its energy at wavelengths shorter than 5 ,um. For most practical purposes, therefore, the solar and terrestrial radiation streams can be treated independently. The Planck function behaves very differently in its two wings. 42) are known as the Ray leigh-Jeans distribution. As A—»0 or v^»°°, which is the Wien distribution. 2. Breakdown of thermodynamic equilibrium In strict thermodynamic equilibrium, the source function depends only upon temperature, frequency, and the velocity of light.
A) In each separate, homogeneous medium within the enclosure, the radiation is homogeneous, unpolarized, and isotropic. (b) The source function is equal to the intensity, / (c) c'2/v is the same in all media in the enclosure, where c' is the velocity of light in the medium concerned. (d) As a direct consequence of (c), c'2/v must be a universal function of temperature (0) only, and will be written c2Sv where c is the velocity of light in vacua. A further consequence of the existence of strict thermodynamic equilibrium is that Bv must have the form where F is an unknown function.
The bundle of rays, originating on dns, and contained within da>s, transports in time dt and in the frequency range v to v + dv, the energy where IV(P, s) is the specific intensity at the point P in the s-direction. If Iv is not a function of direction the intensity field is said to be isotropic ; if Iv is not a function of position the field is said to be homogeneous. If it is more convenient to use wavelength than frequency we have the alternative definition of intensity, or where c is the velocity of light.