[ci

so most of the CIO, is in the form of CIO; this is a result of the rapidity of the CI + 03 reaction.

Since the CIO, cycle of reactions 1 and 2 and the Chapman mechanism (Section 5.2) both involve the O atom, let us compare, as we have done with the NO, and HO, cycles, the rate of reaction 2 to that of reaction 4 in the Chapman mechanism:

At 35 km, the rate coefficient ratio, ¿cio+oAo k>3 = 3 x 104. We need the altitude dependence of [CIO],

Figure 5.14 shows the stratospheric chlorine inventory as of November 1994 (35_49°N). At 35 km, the CIO mixing ratio was about 0.5 ppb, which translates to

Volume Mixing Ratio, ppb

FIGURE 5.14 Stratospheric chlorine inventory (35-49°N), November 3-12, 1994 (WMO 1998). [Adapted from Zander et al. (1996).]

Volume Mixing Ratio, ppb

FIGURE 5.14 Stratospheric chlorine inventory (35-49°N), November 3-12, 1994 (WMO 1998). [Adapted from Zander et al. (1996).]

FIGURE 5.15 Cly chemical family.

[CIO] ^ 0.7 x 108 molecules cm-3. Thus, at this altitude

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