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Ground-level ozone ( O3 ), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth's atmosphere ), with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas.
Ozone (/ˈoʊzoʊn/) (or trioxygen) is an inorganic molecule with the chemical formula O 3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O 2, breaking down in the lower atmosphere to O 2 (dioxygen). Ozone is formed from dioxygen by the action of ...
Ozone depletion consists of two related events observed since the late 1970s: a steady lowering of about four percent in the total amount of ozone in Earth's atmosphere, and a much larger springtime decrease in stratospheric ozone (the ozone layer) around Earth's polar regions. [1] The latter phenomenon is referred to as the ozone hole.
The ozone layer or ozone shield is a region of Earth 's stratosphere that absorbs most of the Sun 's ultraviolet radiation. It contains a high concentration of ozone (O 3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.
History. Ozonolysis of alkynes. Other substrates. Applications. Ozonolysis as an analytical method. Occurrence. Safety. See also. References. Ozonolysis. In organic chemistry, ozonolysis is an organic reaction where the unsaturated bonds are cleaved with ozone ( O3 ).
Chemical formula. O− 3. Molar mass. 47.997 g·mol −1. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references. Ozonide is the polyatomic anion O− 3. Cyclic organic compounds formed by the addition of ozone ( O3) to an alkene are also called ozonides.
Percent contribution to total greenhouse effect K&T (1997) Schmidt (2010) Contributor Clear Sky With Clouds Clear Sky With Clouds Water vapor 60 41 67 50 Clouds 31 25 CO 2 26 18 24 19 Tropospheric ozone (O 3) 8 N 2 O + CH 4 6 Other 9 9 7 K&T (1997) used 353 ppm CO 2 and calculated 125 W/m 2 total clear-sky greenhouse effect; relied on single atmospheric profile and cloud model.
