Dramatic loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970’s by a research group from the British Antarctic Survey (BAS) who were monitoring the atmosphere above Antarctica from a research station .The Halley Research Station BAS research stations in the Antarctic Rumor has it that when the first measurements were taken in 1985, the drop in ozone levels in the stratosphere were so dramatic that at first the scientists thought their instruments were defective. Replacement instruments were built and flown out. It wasn’t until they confirmed the earlier measurements, several months later, that the ozone depletion observed was accepted as genuine. Evidence that human activities affect the ozone layer has been building up over the last 20 years, ever since scientists first suggested that the release of chlorofluorocarbons (CFCs) into the atmosphere could reduce the amount of ozone over our heads. The breakdown products (chlorine compounds) of these gases were detected in the stratosphere. When the ozone hole was detected, it was soon linked to this increase in these chlorine compounds.
The loss of ozone was not limited to the Antarctic. Around the same time the first firm evidence was produced that there had been an ozone decrease over the heavily populated northern mid-latitudes (30-60N).
The Essay on Pioneers In Ozone Research
J. Andrew Harrison SSN: 412-37-9987 CHEM 3510 Dr. Katmai Pioneers In Ozone Research Win Nobel Prize Three fellows of the American Geophysical Union were awarded the Nobel prize in the area of atmospheric research by the Royal Swedish Academy of Sciences in 1995. The honored professors were: Paul Crutzen of the Max-Plank Institute for Chemistry in Mainz, Germany; Mario Molina of the Massachusetts ...
However, unlike the sudden and near total loss of ozone over Antarctica at certain altitudes, the loss of ozone in mid-latitudes is much less and much slower. Only a few percentage per year. What Is Ozone And How Is It Formed? Ozone (O3 : 3 oxygen atoms) occurs naturally in the atmosphere. The earth’s atmosphere is composed of several layers.
We live in the “Troposphere” where most of the weather occurs; such as rain, snow and clouds. Above the troposphere is the “Stratosphere”; an important region in which effects such as the Ozone Hole and Global Warming originate. Supersonic jet airliners such as Concorde fly in the lower stratosphere whereas subsonic commercial airliners are usually in the troposphere. The narrow region between these two parts of the atmosphere is called the “Tropopause”. Ozone forms a layer in the stratosphere, thinnest in the tropics (around the equator) and denser towards the poles. The amount of ozone above a point on the earth’s surface is measured in Dobson units (DU) – typically ~260 DU near the tropics and higher elsewhere, Though there are large seasonal fluctuations, It is created when ultraviolet radiation (sunlight) strikes the stratosphere, dissociating (or “splitting”) oxygen molecules (O2) to atomic oxygen (O).
The atomic oxygen quickly combines with further oxygen molecules to form ozone. It’s ironic that at ground level, ozone is a health hazard , it is a major constituent of photo chemical smog. However, in the stratosphere we could not survive without it. Up in the stratosphere it absorbs some of the potentially harmful ultra-violet (UV) radiation from the sun (at wavelengths between 240 and 320 nm) which can cause skin cancer and damage vegetation, among other things. The Ozone Hole often gets confused in the press and by the general public with the problem of global warming. While there is a connection because ozone contributes to the greenhouse effect, the Ozone Hole is a separate issue.
However it is another reminder of the effect of man’s activities on the environment. Over Antarctica (and recently over the Arctic), stratospheric ozone has been depleted over the last 15 years at certain times of the year. This is mainly due to the release of manmade chemicals containing chlorine such as CFC’s (ChloroFluoroCarbons), but also compounds containing bromine, other related halogen compounds and also nitrogen oxides (NOx).
The Term Paper on Oxygen and Trees
Trees occupy an important place in the life of man. The trees provide us flowers, fruits, fodder for animals, wood for fire and furniture and provide cool shadow from scorching sun. They give us so many such good things and yet expect nothing in return. Trees give us fruits for food and flowers for pleasure. They provide us timber (wood) for building our houses and making furniture. They provide ...
CFC’s are a common industrial product, used in refrigeration systems, air conditioners, aerosols, solvents and in the production of some types of packaging. Nitrogen oxides are a by-product of combustion processes, eg aircraft emissions.The current levels of depletion have served to highlight a unexpected degree of instability of the atmosphere, and the amount of ozone loss is still
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Ozone Layer Dramatic loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970’s by a research group from the British Antarctic Survey (BAS) who were monitoring the atmosphere above Antarctica from a research station .The Halley Research Station BAS research stations in the Antarctic Rumor has it that when the first measurements were taken in 1985, the drop in ozone levels in the stratosphere were so dramatic that at first the scientists thought their instruments were defective. Replacement instruments were built and flown out. It wasn’t until they confirmed the earlier measurements, several months later, that the ozone depletion observed was accepted as genuine.
Evidence that human activities affect the ozone layer has been building up over the last 20 years, ever since scientists first suggested that the release of chlorofluorocarbons (CFCs) into the atmosphere could reduce the amount of ozone over our heads. The breakdown products (chlorine compounds) of these gases were detected in the stratosphere. When the ozone hole was detected, it was soon linked to this increase in these chlorine compounds. The loss of ozone was not limited to the Antarctic. Around the same time the first firm evidence was produced that there had been an ozone decrease over the heavily populated northern mid-latitudes (30-60N).
However, unlike the sudden and near total loss of ozone over Antarctica at certain altitudes, the loss of ozone in mid-latitudes is much less and much slower.
Only a few percentage per year. What Is Ozone And How Is It Formed? Ozone (O3 : 3 oxygen atoms) occurs naturally in the atmosphere. The earth’s atmosphere is composed of several layers. We live in the “Troposphere” where most of the weather occurs; such as rain, snow and clouds. Above the troposphere is the “Stratosphere”; an important region in which effects such as the Ozone Hole and Global Warming originate. Supersonic jet airliners such as Concorde fly in the lower stratosphere whereas subsonic commercial airliners are usually in the troposphere.
The Essay on Ozone Upper Atmosphere
Ozone, pronounced OH Z ohn, is a form of oxygen that is present in the earth's atmosphere in small amounts. Ozone in the upper atmosphere is a major factor in making life on earth possible. But ozone in the lower atmosphere contributes to air pollution. Ozone is used commercially in water purification process and as a bleaching agent. Ordinary oxygen molecules have two oxygen atoms, ozone has ...
The narrow region between these two parts of the atmosphere is called the “Tropopause”. 2 Ozone forms a layer in the stratosphere, thinnest in the tropics (around the equator) and denser towards the poles. The amount of ozone above a point on the earth’s surface is measured in Dobson units (DU) – typically ~260 DU near the tropics and higher elsewhere, Though there are large seasonal fluctuations, It is created when ultraviolet radiation (sunlight) strikes the stratosphere, dissociating (or “splitting”) oxygen molecules (O2) to atomic oxygen (O).
The atomic oxygen quickly combines with further oxygen molecules to form ozone. It’s ironic that at ground level, ozone is a health hazard , it is a major constituent of photo chemical smog. However, in the stratosphere we could not survive without it.
Up in the stratosphere it absorbs some of the potentially harmful ultra-violet (UV) radiation from the sun (at wavelengths between 240 and 320 nm) which can cause skin cancer and damage vegetation, among other things. What Is The Ozone Hole? The Ozone Hole often gets confused in the press and by the general public with the problem of global warming. While there is a connection because ozone contributes to the greenhouse effect, the Ozone Hole is a separate issue. However it is another reminder of the effect of man’s activities on the environment. Over Antarctica (and recently over the Arctic), stratospheric ozone has been depleted over the last 15 years at certain times of the year. This is mainly due to the release of manmade chemicals containing chlorine such as CFC’s (ChloroFluoroCarbons), but also compounds containing bromine, other related halogen compounds and also nitrogen oxides (NOx).
CFC’s are a common industrial product, used in refrigeration systems, air conditioners, aerosols, solvents and in the production of some types of packaging.
The Term Paper on Science Of Ozone Oxygen Atom
THE SCIENCE OF OZONE Ozone, though similar to oxygen chemically, is composed of three molecules of oxygen and is usually blue in color with a very strong odor. The atmosphere contains less ozone than the common oxygen. While out of every ten million air molecules, there exist about two million molecules of normal oxygen and only three molecules of ozone. Most of these ozone molecules are typically ...
Nitrogen oxides are a by-product of combustion processes, eg aircraft emissions.The current levels of depletion have served to highlight a unexpected degree of instability of the atmosphere, and the amount of ozone loss is still increasing..
