Abstract
Algorithm for calculation of the chain length and rate of stratospheric ozone depletion in Ox, HOx, NOx, ClOx and BrOx cycles has been developed. The most important new element in the theory of stratospheric chain processes is the correct determination the propagation rate, taking into account all reactions involved rather than a single reaction, which has the lowest rate, as it was usually done before. The role of null chain processes in the cycles has been considered and shown that these processes play a decisive role in formation of families of the odd oxygen, nitrogen, chlorine and bromine in the daytime while at night they play no role. Using two-dimensional model Socrates, and algorithm developed correct rate of ozone depletion and chain length in the cycles above for model conditions of June 2020 at 50。N have been calculated.
Highlights
In the present work we have considered some new conceptions of the stratospheric chain processes theory, and we have demonstrated how this theory can be used for description of the ozone depletion in Ox, HOx, NOx, ClOx and BrOx cycles which are considered to be the main cycles of destruction of stratospheric ozone
To resolve the problem we offer a simple rule for calculating the rate of limiting step (=the rate propagation)— in case of two reactions of propagation, (R2) and (R3)
It allows one to calculate the rate of limiting steps with any number of propagation reactions and any arbitrarily small difference in the rates of these reactions
Summary
For the first time the photochemical theory of stratospheric ozone was developed by the outstanding English geophysicist Sydney Chapmen [1]. The chain length (in this case it’s a number of molecules of ozone, destroyed by one active particle in its life time in the stratosphere) is one of the most important characteristics of chain process. Special importance this index has acquired in the contemporary conditions, when it was convincingly demonstrated, that because of the chain processes the anthropogenic factors proved to be capable of competing with the natural processes. It is important to understand, what a future potential participants of the chain stratospheric processes are danger for the ozone layer and what is their effectiveness in comparison with the chlorine components, having played the dominant role in the anthropogenic depletion of the ozone layer in the end of the past century. New key points in our analysis are a correct determination of the rate of chain propagation and finding algorithm for the chain length calculations in the cycles mentioned above
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