Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
emissivity .
Etymologies
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Examples
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Take two large disks with emissivities of unity, one at temperature T1 the other at T2, the second being higher than the first.
Archive 2008-02-01 EliRabett 2008
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In the literature one can find emissivities for old snow (eps = 0.82) and fresh snow (0.99).
Archive 2008-02-01 EliRabett 2008
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So the emissivities/absorptivities can be quite different for the two phenomena.
Gerry North's Suggested Reading on Climate Models « Climate Audit 2007
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The emissivities of the various substances vary quite a bit.
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The equivalent chart for water vapor and a correction chart for the water vapor/carbon dioxide overlap so the emissivities can be combined can also be found on the web if you look hard enough, in answer to #211.
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Most emissivities over the wavelengths radiated by the earth are in excess of 95% and many of the common surfaces are over 98 or 99% absorptive.
Gerry North's Suggested Reading on Climate Models « Climate Audit 2007
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I have posted a graph of the Hottel emissivities for CO2 at UKweatherworld on page 6 of the debate thread.
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Emissivities are determined by weighting wavelength-dependent emissivities over subgrid soil, vegetation, roads, rooftops, and water.
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Put simply, material groups can be used to describe the optimum wavelengths for highest object emissivities and therefore the most stable results.
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Earth’s emissivity varies greatly at different wavelengths, and the emissivities at different wavelengths change differently in the face of rising CO2 concentrations.
Christopher Monckton: Apocalypse Cancelled « Climate Audit 2006
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