Figure 4.10 Contours of zonally averaged daytime CIO abundance (pptv) for December 1992, derived from IJARS MLS data (version 4).

During the daytime, this ratio is -0.1-0.2 during the day in the lower stratosphere, rising to 20-100 in the upper stratosphere. After sunset, the CI, abundance decreases as CIO reacts NO, to reform ClONO,. In the lower and mid-stratosphere, this process rapidly depletes Cl„ and throughout most of the night the abundance of CI, is essentially zero. In the upper stratosphere, the recombination reaction (4.10) is slow due to

by time constant.
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