Table of Contents
What chemical did Scientists suspect was destroying the ozone?
It’s been exactly one year since US scientists reported a mysterious surge in ozone-destroying chemicals, known as chlorofluorocarbons (CFCs).
When did scientists discover the ozone hole?
In the scientific journal Nature on May 16, 1985, three scientists from the British Antarctic Survey announce their detection of abnormally low levels of ozone over the South Pole.
How do scientists measure ozone depletion?
Dobson spectrophotometers can be used to measure both total column ozone and profiles of ozone in the atmosphere. Total ozone measurements are made by comparing a frequency of the ultraviolet spectrum strongly absorbed by ozone with one that is not. Measurements can be based on light from the sun, moon, or stars.
Which country banned chlorofluorocarbons?
China ratified the treaty in 1991. According to CNN, a global ban on the use of CFCs has been in place since 2010.
Is CFC still used today?
Today, the use of CFCs is outlawed by 197 countries around the world and scientists concur that the ozone layer is slowly recovering as a result.
Which of the following scientist founded the ozone layer in laboratory?
Christian Friedrich Schönbein
Ozone is a naturally occurring substance which was first made in the laboratory in 1839 by German scientist Christian Friedrich Schönbein (1840a, 1840b).
In which part of atmosphere ozone layer is present?
The ozone layer is the common term for the high concentration of ozone that is found in the stratosphere around 15–30km above the earth’s surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun.
Who discovered the formation of ozone from photochemical reaction?
The historical development of the photochemical formation of ozone in the atmosphere is outlined, starting from the discovery of ozone by Schönbein in 1843 and the postulation of its role as UV filter by Hartley in 1881.
What Does CFC mean on Snapchat?
Summary of Key Points “Chlorofluorocarbon” is the most common definition for CFC on Snapchat, WhatsApp, Facebook, Twitter, Instagram, and TikTok.
Is chlorofluorocarbon banned?
A 1987 worldwide ban on ozone-depleting chemicals known as chlorofluorocarbons (CFCs) averted a dangerous rise in the level of ultraviolet radiation (UV) reaching the Earth’s surface.
Is chlorofluorocarbon a greenhouse gas?
The compounds that only contain carbon, chlorine, and fluorine are called chlorofluorocarbons (CFCs). Chlorofluorocarbons are exceptionally strong greenhouse gases and are also responsible for the destruction of stratospheric ozone.
Why is Mario J Molina famous?
Mario Molina (1943–2020) was the first to realize that chlorofluorocarbons (CFCs) could destroy ozone. In the two decades following his discovery, he and his mentor became voices alerting the world to the danger of CFCs and ozone depletion.
What does the term’ozone depletion’mean?
The term “ozone depletion” means more than just the natural destruction of ozone, it means that ozone loss is exceeding ozone creation. Think again of the “leaky bucket.”
What happens to the ozone in the Arctic?
Arctic ozone decreases of as much as 40 percent have been measured. This thinning typically occurs during years when lower-stratospheric temperatures in the Arctic vortex have been sufficiently low to lead to ozone-destruction processes similar to those found in the Antarctic ozone hole.
What happens when ozone is bombarded by the Sun?
Bombarded by the sun’s ultraviolet energy, CFC molecules break up and release chlorine atoms. Free chlorine atoms then react with ozone molecules, taking one oxygen atom to form chlorine monoxide and leaving an ordinary oxygen molecule. Image above: Ozone destruction begins when chlorine and oxygen combine. Credit: NASA
How is the ozone destroyed in the stratosphere?
Ozone Depletion. When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules. One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. Ozone can be destroyed more quickly than it is naturally created.