VDI 3786 BLATT 5
Meteorological measurements concerning questions of air pollution; global radiation, direct solar radiation and net total radiation
| Organization: | VDI |
| Publication Date: | 1 August 1986 |
| Status: | inactive |
| Page Count: | 32 |
| ICS Code (Geology. Meteorology. Hydrology): | 07.060 |
scope:
Introduction
The spectral ränge of solar radiation which is rele¬ vant to meteorology comprises the so-called short-wave ränge from 0.3 to 3 |im which contains 96% of the total extra-terrestrial solar radiation. The maximum of the spectral distribution of solar radiation is at 0.5 [im, Fig. 1. Fundamental quantities of radiation physics are defmed in DIN 5031 Part 1 [12]. Letter symbols for meteorology and geophysics are given in DIN 1304 Part 2 [18].
Essentially the following processes take place when solar radiation is attenuated during its passage through the atmosphere (Fig. 1):
- In the ränge of infrared radiation:
absorption mostly by water vapour, but also by aerosol particles ; relatively low scattering.
- In the ränge of visible radiation:
scattering by molecules and aerosols, weak absorption by aerosols, ozone, and other trace gases.
- In the ränge of ultraviolet radiation:
scattering by molecules and aerosols as well as stronger absorption by ozone, sulfur dioxide, nitrogen dioxide, and other trace gases.
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