Can ozone depletion and global warming interact to produce rapid climate change?
Ozone depletion and climate change, or Ozone hole and global warming in more popular terms .. Is there a connection between the ozone hole and global warming? Union of Concerned . the original on |chapter= ignored ( help). The ozone layer remains depleted, the ocean continues to warm, ice no direct relationship to the details of observed global warming. Dozens. Global warming and ozone layer depletion are two different problems (see the . on climate change are designed to help students appreciate the relationship.
But, ozone depletion is also concerning because it directly impacts the health of humans, and other living organisms. The ozone hole The ozone hole. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer. Stratospheric ozone is constantly produced by the action of the sun's ultraviolet radiation on oxygen molecules known as photochemical reactions.
Although ozone is created primarily at tropical latitudes, large-scale air circulation patterns in the lower stratosphere move ozone toward the poles, where its concentration builds up. In addition to this global motion, strong winter polar vortices are also important to concentrating ozone at the poles. During the continuously dark polar winter, the air inside the polar vortices becomes extremely cold, a necessary condition for polar stratospheric cloud formation.
Polar stratospheric clouds create the conditions for drastic ozone destruction, providing a surface for chlorine to change into ozone-destroying form. They generally last until the sun comes up in the spring. NASA In the s, scientists discovered that the ozone layer was thinning in the lower stratosphere, with particularly dramatic ozone loss—known as the "ozone hole"—in the Antarctic spring September and October.
These chemicals can remain in the atmosphere for decades to over a century. At the poles, CFCs attach to ice particles in clouds. When the sun comes out again in the polar spring, the ice particles melt, releasing the ozone-depleting molecules from the ice particle surfaces. Once released, these ozone-destroying molecules do their dirty work, breaking apart the molecular bonds in UV radiation-absorbing ozone.
Ozone depletion and climate change
The Montreal Protocol Anniversary poster of the Vienna Convention for the Protection of the Ozone Layerthe first international cooperation effort to protect the ozone layer. United Nations Environmental Program. CFCs were commonly found in refrigerants, solvents, propellants, and foam-blowing agents before the Montreal Protocol was agreed on in the s— an international commitment to phase out ozone-depleting chemicals that was universally ratified by all countries that participate in the UN.
The Montreal Protocol set an important precedent but more needs to be done.
The next year,was the fifth warmest on record; the six warmest years on record have occurred in the last decade. And yet, as the class studied the issue further, we learned that the news is not all bad. The nations of the world have already taken collective action to solve one global atmospheric problem: Global warming, as we will discuss below, is a different and a bigger problem, but scientists have already come together to measure, understand the causes of, and set goals for reducing the rate at which it occurs.
The preservice teacher quoted above was attending our college course on the value of Science-Technology-Society STS education for middle and upper elementary students. The STS movement, as it was advanced during the s largely due to Project Synthesischallenged social studies teachers to prepare students to be scientifically literate as well as socially conscious.
Ozone depletion and global warming « RealClimate
This information has been synthesized from comprehensive analyses published by scientists working together in large collaborations, and from works by the authors. Electromagnetic energy coming from the sun is absorbed by the Earth, which radiates some of this energy outward as infrared energy heat. Greenhouse gases, including water vapor H2Ocarbon dioxide CO2methane CH4and nitrous oxide N2Oare produced as part of the natural system for example, CO2 and H2O are by-products of respiration and combustion.
These gases act much like the glass roof of a greenhouse, letting sunlight through, but keeping heat locked in. Since the Industrial Revolution, humans have developed technologies for example, motor vehicles that produce large quantities of greenhouse gases.
- Can ozone depletion and global warming interact to produce rapid climate change?
Also, humans have invented new molecules that are greenhouse gases, for example, chlorofluorocarbons CFCs and some CFC-substitutes that are used as coolants and solvents. Tree rings, pieces of old coral, and cores taken from glaciers and from mud at the bottom of the ocean provide scientists with samples of atmospheric changes that go backyears.
This increase in CO2 comes largely from the burning of fossil fuels coal, oil, and natural gas in automobiles and electrical power plants.
Most atmospheric scientists are now convinced that human industrial activity has caused an enhanced greenhouse effect, leading to an increase in global warming: To complicate matters, some scientists even speculate that the effects of global warming may perturb ocean circulation patterns so much as to throw us into another ice age. Depletion of the Ozone Layer An ozone molecule O3 is composed of three atoms of oxygen.
Is There a Connection Between the Ozone Hole and Global Warming?
Exposure to too much UV radiation is linked to skin cancer, cataracts, and depression of the immune system, and may reduce the productivity of certain crops.
The ozone layer is reduced when man-made CFC molecules comprised of chlorine, fluorine, and carbon reach the stratosphere and are broken apart by short-wave energy from the sun.Ozone Depletion vs Global Warming
Free chlorine atoms then break apart molecules of ozone, creating a hole in the ozone layer. Their manufacture is now banned by an international treaty, the Montreal Protocol, signed by nations. But because CFCs have a long atmospheric lifetime about 50 yearsthose manufactured in the s continue to damage the ozone layer today.
Ozone depletion and climate change - Wikipedia
The amount of CFCs in the stratosphere is now peaking. When the ozone hole was first detected, there was emotional debate in which many U.
It took a few years for scientists to show conclusively that human activity was causing the damage. It did not take long for scientists to invent other chemicals that could replace CFCs for industrial and commercial purposes, but would not harm the ozone layer. But the metaphors used in the discussion ozone shield, ozone hole resonated better with lay people and their concerns.
It is these pre-scientific bridging metaphors built around the penetration of a deteriorating shield that render the ozone problem relatively simple. That the ozone threat can be linked with Darth Vader means that it is encompassed in common sense understandings that are deeply ingrained and widely shared. The fate of celebrities like President Ronald Reaganwho had skin cancer removal from his nose in andwas also of high importance. Economics of global warming Cass Sunstein and others have compared the differing approach of the United States to the Montreal Protocol, which it accepted, and the Kyoto Protocol, which it rejected.
Sunstein assumes that the cost-benefit assessments of climate change action for the US were instrumental in the US' withdrawal from participation in Kyoto.
A citizen boycott of spray cans gained importance in parallel.