the importance of this heat source because of complications involving turbulent heat transfer. In the mesosphere and upper stratosphere, odd-oxygen species, O3, O(3P), and OC/)), are strongly influenced by catalytic reaction sequences, in addition to the Chapman oxygen reactions. Important cycles are The stratosphere is more complex than the mesosphere, but several key odd-oxygen reactions cycles have been identified: Interestingly, nitric oxide deposited in the lower stratosphere may lead to ozone increases (42) through the decomposition of peroxy compounds, for example, The critical reaction 35 also interferes with the odd-oxygen destructive cycles 16 and 31, and 16 and 32. Recently, important new rate-coefficient data have been obtained for several key HOj. reactions. The data are listed in Table 3. Accordingly, the importance of the odd-oxygen generating reactions 35 to 37 has greatly diminished. We have computed ozone column changes due to water vapor and nitric oxide injection by HLLV launch and reentry operations. The computed globally averaged
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