Votes and proceedings of the General Assembly of the state of New-Jersey . est concentrationoccurs where there is a balance between intense radiation(higher altitude) and denser oxygen concentration (loweraltitude). The vagaries of the interactions also ensure thatthe atmosphere does not increase in temperature through-out the entire range from the base of the stratosphereupwards. When an oxygen molecule absorbs solar ultravioletenergy and dissociates, the resultant free oxygen atoms (O)can combine with other oxygen molecules to form second step in the ozone production process depend
Votes and proceedings of the General Assembly of the state of New-Jersey . est concentrationoccurs where there is a balance between intense radiation(higher altitude) and denser oxygen concentration (loweraltitude). The vagaries of the interactions also ensure thatthe atmosphere does not increase in temperature through-out the entire range from the base of the stratosphereupwards. When an oxygen molecule absorbs solar ultravioletenergy and dissociates, the resultant free oxygen atoms (O)can combine with other oxygen molecules to form second step in the ozone production process dependson there being plenty of undissociated oxygen moleculesaround to combine with, and it seems to take place moreefficiently in the presence of other molecules, which catalysethe reaction. So the greatest concentration of ozone isfound between 20 and 30 km altitude. But the free atoms 76-572 O - 76 - 20 New Scientist 2 October 1975 CRS-296 IFLUOROCARBON FILE Temperature (K190 210 230 250 I O N O S P HE regionThermospher* ERE O N^O,S P H E R ED regionMesosphere Straropause. 0-1 o X) E -100 -80 -60 -tO -20 0 Temperature (°C) rigure 2. Variation of atmospheric temperature with height,showing layering of the atmosphere of oxygen may also recombine as ordinary molecularoxygen, or a single atom of oxygen can react with an ozonemolecule to produce two atoms of molecular oxygen. Theozone itself is unstable against photodissociation by radia-tion below about 300 nm (this is the very feature thatrevealed the presence of the ozone layer in the first place),the effect being to produce one oxygen molecule and one Ozone sinks According to the US National Academy of Sciences report,Environmental Impact of Stratospheric Flight, publishedearlier this year, there are three fairly easily identifiablesinks ot ozone. These are the Earths surface, which isestimated to destroy about 1 per cent of the ozone producedglobally; the reaction between oxygen atoms and ozone mole-cules (17 per cent), and brea
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