Global dimming is the phenomenon where the amount of solar radiation reaching the earth’s surface has decreased by pollutants in the atmosphere. This occurrence is the effect caused by the ambient pollution particles caused by burning fossil fuel. It was the 1960’s when scientists first noticed this phenomenon.
Studies show that; because of this phenomena, the amount of solar radiation reaching the earth’s surface has dropped up to 20% around various parts of the earth in the last 60 years.
Global Dimming vs. Global Warming
Here the word “Global Dimming” might look similar to the word “Global Warming”, but it’s not. Global warming is the situation where the atmospheric temperature is rising. Greenhouse gases are responsible for this. These gases produced from excessive use of fossil fuel trap the radiation of the sun reaching the earth’s surface and increase the temperature of the atmosphere.
The phenomenon of global dimming is vice versa. While burning the fossil products fine particles like Aerosols, Fog, Dust, Forest Exudates, Geyser Steam, Soot, Liquid droplets, or another gas containing carbon/sulfate particles are generated. Various anthropogenic activities are responsible for the generation of these particles. The properties of these particles are to absorb or reflect the Sun’s radiation reaching the earth’s surface. And thus creates the cooling effect.
Rational of Global Dimming
As we discussed earlier, apart from Aerosols other major components such as Fog, Dust, Forest Exudates, Geyser Steam, Soot, Ash, Liquid droplets or various gas containing carbon/sulfate particles are responsible for the global dimming.
Various Human activities like Emission form Power plants, vehicles, trains, aircraft, and other utilization of fossil fuel and Natural calamities like Forest/Bush fire and Volcano eruption are core reasons behind the generation of these particles.
Consequences of Global Dimming
This phenomenon causing an inverse effect on the vaporization of water from the earth’s surface. It affects the hydrological cycle, thus creates un-even patterns of rainfall. It has caused acid rain and affected the earth’s environment and living beings.
Because of this phenomena, the temperature has decreased in some part of the world. Consequently, uneven radiation of sun reaching the earth’s surface affects negatively on the photosynthesis process.