Презентация Terrestrial and atmospheric radiation онлайн

Содержание слайда: Terrestrial and atmospheric radiation Earth’s surface radiation As well as any other body with temperature T>0K, the Earth radiates energy. Since the Earth’s temperature is rather low (T=288K), it radiates energy in IR part of the spectrum. Neither Earth, nor its atmosphere, is not absolutely black body. Therefore

Содержание слайда: Radiation of the atmosphere It is of more complex character. As it follows from Kirchhoff’s law, the energy is emitted by only those gases which absorb it. H2O, CO2, O3 are the main absorbers. There are secondary absorbers (in IR area only): NO; N2O; N2O4; N2O5; C2H4; CH4. Usually we neglect their activity in radiation process. Water vapor “WINDOW” of water vapor is 8,5…12 μ. For this wavelength interval the water vapor is most transparent (see table in the lecture note 5). This interval is often called window of minimal extinction. The strongest water vapor absorption band fall on the spectrum interval 5,5..7,0 μ.

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Содержание слайда: Equation of the terrestrial radiation transfer in the atmosphere The basis for the reasoning is the energy brightness. Assuming isotropic field of radiation, relation between flux of radiation (I) and energy brightness (J) will be

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Содержание слайда: Temperature and IR radiation fluxes relation Fluxes of heat radiation averaged over many locations and years are closely related with the average temperature at the same levels where the fluxes were measured. An example of corresponding relations for the layer 1000 – 300 hPa are presented here.

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