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Energy and the Atmosphere

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by

Anistyn Grant

on 27 May 2014

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Transcript of Energy and the Atmosphere

The source of heat for our planet is the sun. The sun's energy warms the Earth's surface and its atmosphere, and then becomes heat energy. Heat energy is transferred through the atmosphere by three different mechanisms.

1) Radiation

2) Conduction

3) Convection
Heat Energy
Energy and the Atmosphere
The main source of solar energy is to heat the Earth, but people also think it has started to cause global warming, thanks to how the atmosphere traps heat for the Earth. Scientists also suspect a warmer climate change thanks to solar energy.
As the Earth absorbs the radiation of the sun (sunlight) the Earth becomes warmer, and produces more infrared radiation, which is quickly absorbed by the air. Thus, the Earth warms the air after being warmed by the hot sun. This warming of the air is called the greenhouse effect, because a greenhouse is warmed in a similar way.
The ozone layer is a region of the Earth's stratosphere that absorbs most of the sun's ultraviolet radiation.Ultraviolet radiation causes sunburn and skin damage,and, if you are overly exposed to it without proper attire (sunscreen) then it could cause cancer.
Greenhouse gases are certain gases in the atmosphere that are more reliable at trapping infrared rays than others. Water vapor and carbon dioxide are two main greenhouse gases.
Convection is a process by which energy is carried from one place to another due to the differences of density in the matter.
Convection
The sun's radiation is distributed through the Earth's surface by the movement of its atmosphere, that is caused from the rotation of the Earth.
Radiation from the sun (popularly known as sunlight) is a mixture of electromagnetic waves ranging from infrared to ultraviolet rays. Sunlight is filtered from the Earth's atmosphere. When this radiation hits the Earth's surface, it heats the ground, and then that heat rises back up to the atmosphere. This heat/sunlight/radiation from the sun is also known as solar energy.
Solar Energy
If the atmosphere let all the radiation from the sun pass through it, the Earth would become a burning ball of heat. When radiation hits the atmosphere, 6% of it is reflected by the atmosphere, and 20% is reflected by clouds. 19% of the radiation is absorbed by water vapor and dust, 4% is absorbed by clouds, and only 51% is absorbed by the Earth's surface.
As explained earlier, energy from the sun is transferred by conduction, convection, and radiation. Through conduction, heat is transferred by direct contact between substances.When molecules of water, rock, soil, or other materials collide with molecules of air, they import some of their energy to the air molecules, and raise the temperature of the air that is in contact with these surfaces.
The Reflection and Absorption of Radiation
Conduction
Distributed Energy
The Ozone Layer
Greenhouse Gases
What Solar Energy Does
The Greenhouse Effect
Full transcript