Ozone Depletion (Montreal protocol)

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Ozone Depletion (Montreal protocol)


What is ozone?



Christabel Dorothy (7)Dionetta Young (8)Edlyn Irvina (9)

What causesozone depletion?


The Nasa study, to be published in Geophysical Research Letters, studied the retreat of six glaciers in western Antarctica that are already the major drivers of global sea-level rise.One of those glaciers, Pine Island, retreated 31km at its centre from 1992-2011. Rignot said all six glaciers together contained enough ice to add an additional 1.2m (4ft) to sea levels around the world.The study honed in on the Thwaites glacier – a broad glacier that is part of the Amundsen Sea. Scientists have known for years that the Thwaites glacier is the soft underbelly of the Antarctic ice sheet, and first found that it was unstable decades ago.The University of Washington researchers said that the fast-moving Thwaites glacier could be lost in a matter of centuries. The loss of that glacier alone would raise global sea level by nearly 2ft.

Ozone is an allotrope of oxygen and was first detected in the stratosphere in 1889.This thin layer of ozone acts like a giant sunscreen. It filters out some of the harmful ultraviolet (UV) radiation from the Sun.Too much UV radiation can cause skin cancer, genetic mutations, eye damage, and harmful to marine life.

The Montreal Protocol on Substances that Deplete the Ozone Layer (a protocol to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. The treaty was opened for signature on September 16th, 1987, and entered into force on January 1st, 1989

A large scale of ozone depletion takes place over the polar regions.Ozone can be destroyed by hydroxyl radical (OH·), nitric oxide radical (NO·), chlorine atom (Cl·) and bromine atom (Br·).

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Montreal Protocol


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