Welcome To Festive Earth Society

The stock of the loss of the stratospheric ozone layer in the Arctic Climate change increases

User Rating: / 0
PoorBest 

Monday, 28 April 2008

A scientist EC record meteorological data station Alert located on the north-east of Ellesmere Island, T. NW  Climate change may increase the frequency and severity of the loss of stratospheric ozone in the Arctic and could delay the recovery of the ozone layer in the Arctic a decade or more, according to a report from Environment Canada which reviews recent scientific activities on the issue. The results show that greenhouse gas that warms the lower atmosphere are the cause of a cooling in the stratosphere of the Arctic spring, where the contribution of the formation of polar stratospheric clouds that allow the depleting substances ozone layer causing more damage.  Two factors contribute significantly to ozone destruction in polar regions during the spring. One of these factors based on the polar vortex, circulation system in the middle almost closed that isolates the polar stratosphere sunlight and the atmosphere surrounding, where a cooling of the extreme temperature. At temperatures of -80 degrees Celsius or less, we must consider a second factor, or the formation of polar stratospheric clouds. These clouds frozen breed division of ozone-depleting substances, which are usually stable and, therefore, harmless to the ozone layer, volatile compounds that are easily broken by solar radiation. For the return of sunlight in spring, these compounds unstable release large quantities of chlorine and bromine - catalysts powerful ozone-depleting and each molecule can destroy thousands of ozone molecules before returning to the troposphere and the be processed by other chemical reactions.   Most of ozone in the world is produced above the tropics and is distributed to the four corners of the globe by winds. Ozone is formed in the stratosphere when oxygen atoms released by ultraviolet (UV) powerful mix of oxygen molecules intact. The sun's rays and the natural chemical reactions contribute to its gradual destruction, but there is usually a new training sufficient to fill the ozone losses. In recent years, excessive amounts of substances that deplete the ozone layer released into the atmosphere because of human activity threaten the ozone layer. During the six of the last nine years, there were unusual small quantities of ozone above the Arctic during the spring season, including ozone losses of up to 45 p. A computer model of impoverishment minimum and maximum possible of ozone in the Arctic until the year 2060 (Source: Arctic Ozone, 2008) The lower stratospheric temperatures cause the formation of more frequent polar clouds and is expected at the same time that industrial chemicals depleting the ozone will reach record levels, or are close to doing so during the next 10 to 20 years, the situation could therefore worsen in the following decades. Due to a greater loss of ozone, forms of life in the Arctic are very fragile exposed to UV rays from the sun, whose quantity is increasing, and this situation could result in a reduction ozone levels above southern Canada as ozone is redistributed in the atmosphere. Stratospheric ozone observatory at Eureka on the west coast of Ellesmere Island. It requires further study and monitor the ozone layer in the Arctic in order to understand trends and atmospheric processes. Climate change and ozone depletion should not be treated independently, but as interlines elements of a common strategy to mitigate the human consequences on the atmosphere.

Last Updated ( Thursday, 03 July 2008 )

 

< Prev		Next >