Verein Deutscher Ingenieure

Meteorological measurements concerning questions of air pollution; global radiation, direct solar radiation and net total radiation
 N VDI 3786 BLATT 5

Annotation

Introduction

The spectral range of solar radiation which is rele¬ vant to meteorology comprises the so-called short-wave range 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 range of infrared radiation:

absorption mostly by water vapour, but also by aerosol particles ; relatively low scattering.

— In the range of visible radiation:

scattering by molecules and aerosols, weak absorption by aerosols, ozone, and other trace gases.

— In the range of ultraviolet radiation:

scattering by molecules and aerosols as well as stronger absorption by ozone, sulfur dioxide, nitrogen dioxide, and other trace gases.

Автоматический перевод:

Метеорологические измерения относительно вопросов загрязнения воздуха; глобальная радиация, прямая солнечная радиация и радиация чистого итога