By E. Meszaros
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Extra info for Atmospheric Chemistry: Fundamental Aspects
It thus appears from theory that nitrogen oxides may constitute a threat to ozone. However, more recent work has led to a total revision of the theory. While the details are more complex than it is possible to describe here, the key reactions are understandable. One possible sequence is given in Table 9. The result is that NO, forms ozone by this sequence while destroying it by the previous one (Johnston and Podolske, 1978). Table 9 A possible reaction sequence in the stratosphere involving NO, (Johnston and Podolske, 1978) 1 2 3 4 5 6 7 8 9 10 11 NO, +hv+NO + O O+CH,+OH+CH, OH+CH,+H,O+CH, CH,+ O,+H,CO+OH H,CO +hv+ H HCO HCO+O,+CO+ HO, OH + CO+CO, + H H + O , + M+ HO, M HO, + NO+OH + NO, O + O , + M+O, + M OH HO,+ HzO+Oz + + + ~ o r vThae rcpctims are also 01 interest lor tropospheric chemistry ( r e other purls d thts book).
Its value is equal to the ratio of the number of “ A reacted to that of excited molecules. The primary photochemical processes are generally followed by secondary thermal reactions the energy of which is provided by the thermal agitation of molecules. In the case of a bimolecular reaction’ : D,+E+X+Y --dCD1l =-d[X1 =k[D,] [El dt dt where k is the rate constant, which is equal to the quantity of D, reacted per unit time if the [D,] and [El concentrations are also unity. It can be Seen from the last equation that the loss rate of D, is equal to the formation rate of X in molar units.
However, above the tropopause the volume mixing ratio decreases with increasing altitude. The initial decrease is rather rapid then, above a certain level, it becomes slower. On the basis of available data, the total atmospheric methane mass is calculated to be 4ooo x lo6 t. The origin of atmospheric methane can be estimated by determining its 14C isotope abundance. This abundance should be the same as the 14Ccontent of living plants, if methane is of biological origin or is provided by recently dead organisms.
Atmospheric Chemistry: Fundamental Aspects by E. Meszaros