THE sky orange, more intense during the fall and the winter especially in urban areas, it is a phenomenon caused by the combination of factors such as the incidence angle of sunlight a thermal reversal And, especially, the pollution atmospheric. This phenomenon alters the perception of colors in visible spectrum highlighting reddish tones early in the morning and at dusk.
The colors perceived in the sky are part of visible spectrum of light. The shorter waves, such as blue and violet, disperse more easily during the day when the sun is higher. Therefore, blue is more noticeable in these periods. However, in the morning and in the afternoon, the sunlight It goes a longer way in the atmosphere.
“The blue and violet light (short waves) is all spread and diverted away from our line of vision. Already the red, orange and yellow light (longer wavelength) can cross and reach our eyes. Pollution and dust can intensify the red and orange tones at dawn and dusk,” explains Fernando Mendes, meteorologist of Paraná’s technology system (Simepar).
Thermal reversal
THE thermal reversal common in fall and in winter contributes to the intensification of the orange sky . This phenomenon occurs when a hot air layer overlaps with a cold air layer near the ground, reversing the usual configuration of the atmosphere.
THE thermal reversal imprisons pollution next to the surface, worsening the air quality and intensifying the dispersion of short wave colors. The result is a sky Even more orange and reddish, especially in urban areas. This directly impacts the health of the population and may cause or aggravate breathing problems.
Impact
Urban areas, with greater concentration of polluting activities, suffer more from the effects of thermal reversal and from pollution . THE air quality reduced can cause respiratory problems, being the metropolitan regions the most affected.
In addition, the pollution atmospheric combined with the dry climate of the fall and winter increases the risk of forest fires . Dry vegetation becomes more susceptible to combustion. The smoke of the fires, composed of carbon particles, can be loaded at long distances, making the sky gray and dark.
This content was originally published in orange sky: Understand how pollution highlights colors in autumn and winter on the CNN Brazil website.
Source: CNN Brasil
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