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Monday, June 18, 2012

The disadvantages of aerosols;

Aerosols are the major health issues and problems; 

What are disadvantages of aerosols?

Aerosols comprise a broad collection of particles, and dusts with different properties. Tiny particles of aerosols are suspending in the atmosphere, being in the liquid states, having a resistance against the gravity forces.

What are the sources of aerosols

There are many sources that generate and transmit aerosols, such as, volcanic eruptions, mining activities, wind blowing, combusting fossil fuels, HCF the industry gases, and even the smoke of burning wood or burning plastic matters, etc.

What are the direct effects of aerosols:  

The sun provides the energy that drives Earth's climate, but about quarter of the sun's energy will not reach the surface of Earth, as it should be reflected from the top of the atmosphere by the aerosols, and clouds, to the space. Different aerosols scatter, and absorb, sunlight to varying degrees, depending on their physical properties. Although most aerosols reflect sunlight but some absorb it. These scattering, and absorbing properties are known as the direct effects of aerosols on earth's radiation field.

What are the properties of aerosols: 

Bright colored aerosols, or translucent particles, tend to reflect radiation in all directions and back towards space, while darker aerosols can absorb significant amounts of light. Pure sulfates and nitrates reflect nearly all radiation they meet with, causing cool of the atmosphere. In contrast the black carbon absorbs radiation readily, warming the atmosphere and also shading the surface. Organic carbon or brown carbon, which is the organic matter, has an influence on warming the atmosphere that depends on the brightness of underlying ground. Dust as an aerosol impacts radiation to varying degrees, depending on the composition of the minerals that comprise the dust grains and whether they are coated with black or brown carbon. Salt particles reflect all the sunlight they encounter.

What is the aerosols impact on the climate:  

Aerosols can have major impacts on climate when scatter light. The eruption of volcanoes ejects every years million tons of sulfur dioxide, this gas reacts with other substances to produce sulfate aerosols up to about 60 km above the surface, and create particles in the stratosphere. Those bright particles remain above the clouds, escaping of being washed from the sky by the rain below, and will not settle down until after several years.

How can aerosols alter the reflectivity of planet

In addition to scattering or absorbing radiation, aerosols can change and alter the reflectivity of the planet, because black carbon deposits a layer of dark residue on ice and on other bright surfaces. As being mentioned bright surfaces reflect radiation and cool the climate, whereas darker surfaces absorb radiation and produce a warm effect. The real outcome is the differentiation between the both. In the Arctic especially, aerosols from wildfires and industrial pollutions are likely hastening the melting of ice.

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