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34 10J

Lifetime (s)

10c 10

Figure 4.13 Lifetime of NO,, and its components, calculated for 45°N equinoctial conditions based on daytime-average constituent abundances and photolysis rates: tko ~ I/Wv^noICIO] + A'kOt0i[0,j + IHOJ), tn„2 - 4o,-<,101), tno ~ l//n(>j, tNO< - [NOJ/(**N()),on[OHl(NO,| +

34 10J

Lifetime (s)

10c 10

Figure 4.13 Lifetime of NO,, and its components, calculated for 45°N equinoctial conditions based on daytime-average constituent abundances and photolysis rates: tko ~ I/Wv^noICIO] + A'kOt0i[0,j + IHOJ), tn„2 - 4o,-<,101), tno ~ l//n(>j, tNO< - [NOJ/(**N()),on[OHl(NO,| +

.JBrOHNO,! + ^,i(),noJC10|[N02| + 2A*no„noJNOJINOJ), xr

^■O+CIONO^rO) + ^OH-K.iONoJ^^lX ^HrONO, ~ J/iAjiONO, ^icrosoi)' ^IINO: ~ l/C^HNO, ^HNO^IlK^H]).

Figure 4.14 shows the major interconversion pathways of NO,. NO is converted to NO, in the reactions

Note that the second reaction (reaction (4.6)) is also an important reaction for partitioning CI,. In the upper stratosphere, the reaction with HO, becomes important:

NO, is converted back to NO through the reactions

NO, is formed from NO, in the reaction

NO, is converted to NO and NO, through photolysis:

About eight times as many NO, molecules photolyze to form NO, and O as form NO and O, (see DeMore et al. [51, p. 158).

photolysis ^photolysis^^ photolysis^ O

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