Incomplete combustion of fossil fuels (ex diesel) and wood soot released into the air. Although this is a very insignificant component of air pollution in the earth’s surface, the phenomenon has a significant heating of the atmosphere at altitudes above two kilometers, also cooling the ocean surface, absorbing solar radiation.
Experiments in the Maldives (where he compared the atmosphere over northern and southern islands) in 1990 showed that the effect of macroscopic pollutants in the atmosphere at that time (coming from South India) caused a 10% reduction in the level of sunlight reaching the surface pollutant under a cloud – a reduction far greater than expected particles themselves
Before you perform this research, an estimated 0.5-1% due to a factor of particles, large variation of this prediction can be explained by the formation of clouds of particles as the center of raindrops. Clouds are a very active element in the reflection of light back into space.
Phenomenon that caused the darkening global and regional effects may be. While much of the Earth has warmed, the regions that are downwind from major sources of pollution blows air (especially sulfur dioxide emissions) have cooled considerably. This explains the cooling of the eastern part of the United States and the relative warming of the western
Some climatologists consider that the traces of planes (traces of vapor) is a global factor of darkness, but constant air flow did not allow testing this theory. Stop all civil air traffic for three days after the attacks of 11 September 2001 in the United States provided a rare opportunity to observe the impact of trace vapor on the climate. During this period, was observed an increase in diurnal temperature variations of more than 1 ° C in most regions of the United States, this vapor trail demonstrating that increased night temperatures and / or decreased daytime temperatures by much more than previously thought.
Volcanic ash released into the air can reflect sunlight back into space and thus can cool the planet. Temperature slump in the Earth’s atmosphere have been observed after large volcanic eruptions such as Mount Agung in Bali in which erupted in 1963, El Chichon in Mexico, which erupted in 1983, Ruiz in Colombia, which erupted in 1985 or Pinatubo in the Philippines, which erupted in 1991. However, major eruptions and ash clouds remain stable only for relatively short periods.
