Question

what do you mean by ozone depletion .what are its causes

Answer 1

Ozone depletion describes two related phenomena observed since the late 1970s: a steady decline of about four percent in the total amount of ozone in Earth's stratosphere(the ozone layer), and a much larger springtime decrease in stratospheric ozone around Earth's polar regions. The latter phenomenon is referred to as the ozone hope. There are also springtime polar tropospheric ozone depletion events in addition to these stratospheric phenomena.

The main cause of ozone depletion and the ozone hole is man-made chemicals, especially man-made halocarbon refrigerants, solvents, propellants, and foam-blowing agents (chlorofluorocarbon (CFCs), HCFCs, halons), referred to as ozone-depleting substances (ODS). These compounds are transported into the stratosphere by the winds after being emitted at the surface.Once in the stratosphere, they release halogen atoms through photodissociation, which catalyze the breakdown of ozone (O3) into oxygen (O2).Both types of ozone depletion were observed to increase as emissions of halocarbons increased.

Answer 2

Ozone is a powerful oxidant, and it is metastable. So anything that does not have fluorine bonded on first, can be attacked by ozone, depleting ozone. Since depletion is “less than normal amounts of ozone”, then only changes in atmospheric contaminants can reduce the steady-state amount of ozone he Sun leaves in the ozone layer.

Some of the major contaminants are:

water vapor (both Nature and Man by a few pathways add this);chlorine and bromine atoms (both Nature and Man add these);sulfur compounds (both Nature and Man add these).

Please note that the “annual polar ozone hole” is not a sign of ozone depletion. Increases in its size, “depth”, starting sooner, and total duration ARE symptoms of ozone depletion. The ozone hole is an “amplifier” for ozone depletion world-wide.

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