Bywhen better evidence on the speed of critical reactions was available, this estimate was changed to 5 to 9 percent steady-state depletion. Marked decreases in column ozone in the Antarctic spring and early summer compared to the early s and before have been observed using instruments such as the Total Ozone Mapping Spectrometer TOMS.
One of the major chemicals is the chloroflurocarbons CFC. Reactions that take place on polar stratospheric clouds PSCs play an important role in enhancing ozone depletion. The Chair of the Board of DuPont was quoted as saying that ozone depletion theory is "a science fiction tale … a load of rubbish … utter nonsense".
After the discovery of CFC problem in mid seventies, ozone destruction by active chlorine lO has become a dominating question. However, more recent analysis in by David W.
It is expected to recover around In spite of being a trace gas, it plays a major role in the maintenance of climate and biology of earth. Bromine is more deadly than chlorofluorocarbons, it is 50 times more harmful than CFCs. Biological effects[ edit ] The main public concern regarding the ozone hole has been the effects of increased surface UV radiation on human health.
Scientists have predicted that bytemperature over the earth would be higher than that of the same during the last years.
Global warming means the increase of temperature of the earth. Another factor that Ozone depletion and industrial output essay prolong ozone depletion is the drawdown of nitrogen oxides from above the stratosphere due to changing wind patterns.
Some stratospheric cooling is also predicted from increases in greenhouse gases such as CO 2 and CFCs themselves; however, the ozone-induced cooling appears to be dominant.
Molina suggested that long-lived organic halogen compounds, such as CFCs, might behave in a similar fashion as Crutzen had proposed for nitrous oxide. The air we breathe is in the form of oxygen molecules O2 — two atoms of oxygen link together, its colorless and odorless, on the other hand, ozone is also a form of oxygen and is colorless, it is created in the stratosphere when UV radiation from the sun strikes the oxygen and is split up to form ozone, it has a very disturbing odor like that of a burnt electric wire.
DuPont may have feared court action related to increased skin cancer, especially as the EPA had published a study in claiming that an additional 40 million cases andcancer deaths were to be expected in the U.
CFCs released up toamounted to 15 million tones. Ozone in Earth's atmosphere[ edit ] The distribution of atmospheric ozone in partial pressure as a function of altitude Concentration of ozone as measured by the Nimbus-7 satellite Total ozone concentration in June as measured by EP-TOMS satellite instrument The standard way to express total ozone levels the amount of ozone in a given vertical column in the atmosphere is by using Dobson units.
One good step but difficult to implement is the restriction of economic expansion of producing chemicals that has quantitative amount of destruction of the atmosphere.
One study showed that a 10 percent increase in UVB radiation was associated with a 19 percent increase in melanomas for men and 16 percent for women. The list should include name of ODS, type and location of equipment, quantity in kg and date.
More essays like this: Ozone layer is a protective stratospheric layer, also known as ozone umbrella.
This was the reason for the Montreal Protocol. CFCs do not break or dissolved into small substances, it will just climb and move smoothly in the atmosphere up to eight years until they reach the ozone layer where they are able to broken down into pieces through huge sums of ultraviolet radiation.
The reactions deplete ozone layer. As the ozone hole over Antarctica has in some instances grown so large as to affect parts of AustraliaNew ZealandChileArgentinaand South Africaenvironmentalists have been concerned that the increase in surface UV could be significant.
An ozone molecule which contains three oxygen atoms is broken down when UV radiation hits one chlorine atom and is destroyed, after this the ozone molecule will change into oxygen. Last of all, we will deal with several solutions and their associated shortcomings and must describe how other cultures or nations are affected by, and view, this problem.
The hatched areas show rough estimates of what might occur due to climate-related changes in clouds and atmospheric fine particles aerosols.
The gray areas show the calculated response to the ozone changes shown in c. Based on these results, ozone depletion is predicted to cause hundreds of thousands of additional cataracts by Even more convincing was the measurement, by James G.
The changes that are occurring now have their origin in the Industrial Revolution since and the expansion of technology. Derivatives of this anion are explosive and must be stored at cryogenic temperatures.
Ozone O3 is a triatomic form of oxygen. The termination reaction is catalysed by the presence of certain free radicals, of which the most important are hydroxyl OHnitric oxide NO and atomic chlorine Cl and bromine Br. In SeptemberMontreal Protocol was signed.
In the following year, Crutzen and independently Harold Johnston suggested that NO emissions from supersonic passenger aircraftwhich would fly in the lower stratosphere, could also deplete the ozone layer.Ozone depletion describes two related events observed since the late s: a steady lowering of about four percent in the total amount of ozone in Earth's atmosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone around Earth's polar regions.
Ozone Depletion Essay Sample. INTRODUCTION To give emphasis on the discussion of this paper, it is best to define first the meaning of ozone, ozone layer and other related words that we will encounter during the course of our discussion.
Ozone Layer Essay; Ozone Layer Essay. The Layers of Research Design. Ozone Depletion and Industrial Output For years, we have heard about the ozone crisis: that because of industrialization and the lack of pollution-consciousness by our industries, governments, and academia, we have put so many environmentally harmful products.
Ozone Depletion and Industrial Output Essay - Ozone Depletion and Industrial Output For years, we have heard about the ozone crisis: that because of industrialization and the lack of pollution-consciousness by our industries, governments, and academia, we have put so many environmentally harmful products into the atmosphere that our ozone.
- Ozone Depletion Atmospheric ozone layer depletion is a serious problem currently facing the world. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays. Money and time are being spent on ozone repair, but the problem still exists.
- Ozone Depletion Atmospheric ozone layer depletion is a serious problem currently facing the world. The ozone layer protects humans, animals, and plants from harmful ultraviolet rays. Money and time are being spent on ozone repair, but the problem still exists.Download