The theories on the ozone layers depletion

New scientific evidence continues to demonstrate that the ozone depletion models -and the resulting ban on CFCs- are based on a Big Lie By Rogelio Maduro Co-author of the book " The Holes in the Ozone Scare"New satellite ozone data and other atmospheric studies based on actual measurements confirm that the ozone layer is not a homogeneous, flat and that atmospheric dynamics, not chemistry, is the driving factor that determines the thickness of the ozone layer.

The theories on the ozone layers depletion

Contributors The earth's stratospheric ozone layer plays a critical role in absorbing ultraviolet radiation emitted by the sun.

In the last thirty years, it has been discovered that stratospheric ozone is depleting as a result of anthropogenic pollutants. Introduction The atmosphere of the Earth is divided into five layers.

In order of closest and thickest to farthest and thinnest the layers are listed as follows: Humans rely heavily on the absorption of ultraviolet B rays by the ozone layer because UV-B radiation causes skin cancer and can lead to genetic damage.

The ozone layer has historically protected the Earth from the harmful UV rays, although in recent decades this protection has diminished due to stratospheric ozone depletion.

This "ozone hole" has extended to cover an area as large as The previous record of Figure courtesy of NASA. Ozone depletion is largely a result of man-made substances. Humans have introduced gases and chemicals into the atmosphere that have rapidly depleted the ozone layer in the last century.

Health and Environmental Effects of Ozone Layer Depletion | Ozone Layer Protection | US EPA

This depletion makes humans more vulnerable to the UV-B rays which are known to cause skin cancer as well as other genetic deformities. The possibility of ozone depletion was first introduced by scientists in the late 's as dreams of super sonic transport began to become a reality.

The threat of ozone depletion from commercial super sonic transport was so great that it is often cited as the main reason why the US federal government pulled support for its development in Fear of ozone depletion was abated until when Sherwood Rowland and Mario Molina discovered that chlorofluorocarbons could be photolyzed by high energy photons in the stratosphere.

The Chapman Cycle The stratosphere is in a constant cycle with oxygen molecules and their interaction with ultraviolet rays. This process is considered a cycle because of its constant conversion between different molecules of oxygen.

The ozone layer is created when ultraviolet rays react with oxygen molecules O2 to create ozone O3 and atomic oxygen O. This process is called the Chapman cycle. An oxygen molecules is photolyzed by solar radiation, creating two oxygen radicals: Oxygen radicals then react with molecular oxygen to produce ozone: Ozone then reacts with an additional oxygen radical to form molecular oxygen: Ozone can also be recycled into molecular oxygen by reacting with a photon: Because of this, the thickness the ozone layer at any particular time can vary greatly.

This prolonged life in the atmosphere allows them to reach great altitudes where photons are more energetic. When the CFC's come into contact with these high energy photons, their individual components are freed from the whole.

The following reaction displays how Cl atoms have an ozone destroying cycle: Chlorine initiates the breakdown of ozone and combines with a freed oxygen to create two oxygen molecules. After each reaction, chlorine begins the destructive cycle again with another ozone molecule.

One chlorine atom can thereby destroy thousands of ozone molecules. Because ozone molecules are being broken down they are unable to absorb any ultraviolet light so we experience more intense UV radiation at the earths surface.

Figure courtesy of NOAA. For three years it was assumed that the ozone data was incorrect and was due to some type of instrument malfunction.

Inresearchers finally realized their error and concluded that an enormous hole in the ozone layer had indeed developed over Antarctica. Examination of NASA satellite data later showed that the hole had begun to develop in the mid 's. The ozone hole over Antarctica is formed by a slew of unique atmospheric conditions over the continent that combine to create an ideal environment for ozone destruction.

The theories on the ozone layers depletion

Because Antarctica is surrounded by water, winds over the continent blow in a unique clockwise direction creating a so called "polar vortex" that effectively contains a single static air mass over the continent. As a result, air over Antarctica does not mix with air in the rest of the earth's atmosphere.

Antarctica has the coldest winter temperatures on earth, often reaching F.The theory that man-made CFCs would deplete the ozone layer is one of many theories claiming that ozone depletion would lead to doomsday. The theory originated in March , when James McDonald, an atmospheric physicist from the University of Arizona, testified at congressional hearings of the Super-Sonic Transport (SST) program.

The Ozone Layer: a Hole in the Theory. Some scientists have proclaimed that the human race is slowly depleting the layer of ozone which protects us from ultra violet light.

In reality, humans have very little control of the world in which we live. The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the Earth's atmosphere.

However, various factors have led to the depletion and damage of this protective layer.

The theories on the ozone layers depletion

Learn more about the process, causes, and effects of ozone layer depletion. Depletion of the ozone layer, however, explains all observations of global warming quite clearly. Greenhouse gas theory is based on an erroneous assumption made years ago, that radiant thermal energy is additive.

The Ozone Depletion Theory The theory that man-made CFCs would deplete the ozone layer is one of many theories claiming that ozone depletion would lead to doomsday. The theory originated in March , when James McDonald, an atmospheric physicist from the University of Arizona, testified at congressional hearings of the Super-Sonic Transport (SST) program.

The ozone layer is a belt of the naturally occurring gas "ozone." It sits to miles (15 to 30 kilometers) above Earth, and serves as a shield from the harmful ultraviolet B (UVB) radiation.

The Ozone Depletion Theory