By Craig F. Bohren, Eugene E. Clothiaux
Assembly the necessity for educating fabric appropriate for college kids of atmospheric technological know-how and classes on atmospheric radiation, this textbook covers the basics of emission, absorption, and scattering of electromagnetic radiation from ultraviolet to infrared and past. a lot of the contents applies to planetary surroundings, with graded discussions supplying a radical remedy of topics, together with unmarried scattering by means of debris at various degrees of complexity. The dialogue of the easy a number of scattering concept introduces options in additional complicated theories, such that the extra complex two-stream thought permits readers to development past the pile-of-plates concept.
The authors are physicists instructing on the biggest meteorology division within the US at Penn nation. the issues given within the textual content come from scholars, colleagues, and correspondents, and the figures designed specifically for this ebook facilitate comprehension.
perfect for complex undergraduate and graduate scholars of atmospheric technological know-how.
- loose options handbook on hand for teachers at www.wiley-vch.de/supplements/
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Extra resources for Fundamentals of Atmospheric Radiation
If we assume that the average emissivity Eq. 57) is equal to the average absorptivity Eq. 59), we should do so knowing that this is not strictly true except for a body at temperature T illuminated by blackbody radiation for this temperature. Equality of the two averages may be a good approximation under some circumstances, such as if the spectral quantities are nearly independent of frequency over the range of frequencies for which the weighting functions have their greatest values. 4 Brightness and Color Temperature Suppose we have an instrument that can measure radiant power over some range of frequencies anywhere in the electromagnetic spectrum.
Color temperatures of skylight are 10,000–40,000 K. Perhaps it is fortunate that we can’t touch the sky. If we could, we’d surely burn our fingers. 5 A Few Comments on Terminology No single term, not misleading or faintly ludicrous, for radiation emitted by matter at typical terrestrial temperatures is adequate to distinguish it uniquely and unambiguously from solar radiation. Despite the title of Planck’s book (the German title of which may not have the same connotations as its English translation), there is no such thing as “heat radiation” in the sense of a special kind of radiation emitted only by “heated bodies”.
It is at best an analogue, useful for helping us understand some basic physics, possibly to frame testable hypotheses, even to estimate relative changes if used judiciously. For example, if ε of the atmosphere is increasing because of increased amounts of infrared-active gases, this suggests that temperatures in the lower atmosphere could increase. 73) is the basis for interpreting global warming as the result of “closing the window”. As the transmissivity of the (analogue) atmosphere decreases, the radiative equilibrium temperature Te increases.