THE ATMOSPHERE
by Antonio C. Antonio
January 24, 2015
So far, the Earth in the only known planet that has an
atmosphere that is capable of supporting life.
It now becomes a saddening fact that we have largely taken our
atmosphere for granted. More often, the
only time we become concerned about the atmosphere is when the weather and
pollution indices are bad. The only time
we show concern for the atmosphere and the environment in general is when
global warming rises to the level that makes life unbearable, climate and weather
patterns change for the worse to the point where countless lives are lost, and
basic life support system Mother Earth provides has degenerated to a point
where diseases are very common occurrences.
It should be noted that these disastrous effects are caused by
anthropogenic activities.
The atmosphere is composed of four distinct layers or
atmospheric zones of contrasting temperature.
The difference in temperature is caused primarily by the variation in
solar energy absorption. A clear
understanding of the characteristics of these atmospheric zones will help us
understand atmospheric functions. The
following are these thin layers of air in the atmosphere:
TROPOSPHERE – The troposphere is the lowest layer of the
Earth’s (or nearest to the Earth’s surface) atmosphere and site of all weather
conditions on Earth. The troposphere is
bonded on the top by a layer of air called tropopause which separates the
troposphere from the stratosphere and on the bottom by the surface of the
Earth.
STRATOSPHERE – The stratosphere is the second major layer of
air in the Earth’s atmosphere which is above the troposphere and below the
mesosphere. It is stratified in
temperature with cooler air below that gradually warmer layers of air farther
up or away from the surface of the Earth.
Air temperature in this layer is stable although it increases with
higher altitude. Ozone is produced by
lighting and solar irradiation of oxygen molecules. It should be mentioned that ozone protects
life on Earth by absorbing most solar and ultraviolet radiation from the sun
that passes through the upper layers of the atmosphere.
MESOSPHERE – The mesosphere is the layer of the Earth’s
atmosphere that is directly above the stratosphere and directly below the
thermosphere. The mesosphere is located
about 50 to 85 kilometers above the Earth’s surface.
THERMOSPHERE – The thermosphere is the layer of the Earth’s
atmosphere directly above the mesosphere and below the exosphere. In this layer of air in the atmosphere,
ultraviolet radiation (UV) causes ionization.
EXOSPHERE – The exosphere is the uppermost region of Earth’s
atmosphere as it gradually fades into the vacuum of space. Air in the exosphere is extremely thin and in
many ways it is almost the same as the airless void of outer space.
The layers of air in the atmosphere protects the Earth’s
surface from abnormal exposure to solar radiation and foreign bodies coming
from outer space. Smaller meteors and
meteorites burn up as they hit the exosphere and are reduced to smaller masses
before they hit the Earth’s surface. Protecting and supporting life forms on the
surface of the Earth is the main function of the atmosphere.
Just my little
thoughts…
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