BBC - GCSE Bitesize Science - Depletion of the ozone layer : Revision, Page 3
While acting to destroy ozone, CFCs and HCFCs also act to trap heat in the lower Regulations are in place to help prevent the release of CFCs, HCFCs and. The most abundant CFCs emitted into the troposphere are CFC 11 and CFC Ozone and nitrate radicals are even less effective at breaking down CFCs. Ravenmaster Christopher Skaife Tells of His Relationships with the Tower of. Chlorofluorocarbons (CFCs) are a group of compounds which contain the As VOCs, they may be slightly involved in reactions to produce ground level ozone, .
There's a politics within the scientific community, where they're all too intimidated to speak out once someone has staked out a position And under this Congress, we're going to get to the truth and not just the academic politics. And what I'm asking you, in your search for good science, is what peer-reviewed documentation did you use to come up with your decision?
What good science did you rely on? I do not have that burden. He replied that he had not, because "Well, I just haven't been presented with the study of late.
Elizabeth Whelan to support his criticism of peer-reviewed science.
- How do CFCs destroy the ozone layer?
- The Skeptics vs. the Ozone Hole
- Global warming caused by chlorofluorocarbons, not carbon dioxide, new study says
But according to the Columbia Journalism Review, Dr. Whelan praises the nutritional value of fast food in her writings, and dismisses the links between fatty diets and heart disease--but receives funding from Burger King, Oscar Meyer, Frito Lay, and Land O' Lakes Kurtz, Unfortunately, our House Majority Leader is not the only one who relies on Dr.
Fred Singer, the expert whom Representative Doolittle referred to, has testified before Congress numerous times, and is probably the most widely quoted skeptic on the ozone hole and global warming issues. Singer cannot be considered an active scientist publishing in the peer-reviewed literature, or even an objective informed critic.
Singer touts himself as having "published more than peer-reviewed scientific papers over the course of his career". Singer's contributions to atmospheric science have been essentially zero since A search for his relevant publications in the atmospheric sciences reveals two peer-reviewed pieces since A search of the Science Citation Index, the comprehensive scientific journal database that indexes virtually every citation a journal article gets in the peer-reviewed scientific literature, reveals that this paper, which Dr.
Singer calls a "key research publication"has been cited exactly zero times, as of for comparison, Dr.
Steven Schneider's publication in Nature on the same topic, "Simulating the climatic effects of nuclear war", has gotten 16 citations. Furthermore, the think tank Dr. Trumpet discredited scientific studies and myths supporting your point of view as scientific fact.
The skeptics primarily published in non-peer-reviewed newspapers, magazines, books, and think tank publications. Publications that do not undergo peer-review are frequently filled with factual errors, distortions, and opinionated statements that greatly confuse the public on issues where there is no scientific uncertainty. For example, numerous critics of the ozone hole discovery e.
Dobson had measured an ozone hole in in the Antarctic, and thus an Antarctic ozone hole was a normal natural occurrence. This myth arose from a misinterpretation of an out-of-context quotation from a review article Dobson,where he mentioned that when springtime ozone levels over Halley Bay were first measured, he was surprised to find that they were about Dobson Units below springtime levels in the Arctic.
The skeptics repeatedly refer to "an ozone hole Dobson Units below normal" that was discovered inwhen in fact the levels discovered in were normal for Antarctica.
Global warming caused by chlorofluorocarbons, not carbon dioxide, new study says
A trip to the British Antarctic Survey's web site will confirm that no such ozone hole was measured in the s. Another myth the skeptics repeat states that a French scientist found an Antarctic ozone hole in Bailey, These irregularities make some parcels of air buoyant, which results in the transport of pollutants throughout the atmosphere.Climate 101: Ozone Depletion - National Geographic
Given sufficiently large variations in temperature and pressure, air parcels containing contaminants can be transported through the troposphere and into the stratosphere, in much the way that a hot air balloon can be used to loft people high above the ground and transport them from one place to another. Pollutants can reach the stratosphere, however, only if there are no major mechanisms that pull them out of the air while they are still in the troposphere. A common example of deposition is 'rain out': This phenomenon is responsible for acid rain.
These CFCs are not soluble in water, so deposition does not removed them from the air. Atmospheric researchers have determined the rates at which several CFCs react with hydroxyl radicals; the lifetimes for these CFCs with respect to hydroxyl radicals is approximately 80 years. In other words, if hydroxyl radicals were the only thing reacting with the CFCs, it would take 80 years to completely remove them from the atmosphere.
That is a long time! Chlorofluorocarbons CFCs are a group of compounds which contain the elements chlorine, fluorine and carbon.
At room temperatures, they are usually colourless gases or liquids which evaporate easily. They are generally unreactive and stable, non-toxic and non-flammable. What is it used for? The properties of CFCs make them useful for a variety of commercial and industrial purposes: Where does it come from? Most CFCs have been released to the atmosphere through the use of aerosols containing them and as leakages from refrigeration equipment.
Other releases may occur from industry producing and using them and other products containing them.
How do CFCs destroy the ozone layer? | LifeGate
There are not thought to be any natural sources of CFCs to the environment. How might it affect the environment? CFCs are unlikely to have any direct impact on the environment in the immediate vicinity of their release.