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January February

FIGURE 12.41 Mean depletion rate (% day-1) in Arctic polar vortex in January and February 1992 (adapted from von der Gathen et al., 1995).

Hours exposed to sunlight

FIGURE 12.40 Loss of O3 in Arctic polar vortex as a function of hours of exposure of the air mass to sunlight (adapted from von der Gathen et al., 1995).

January February

FIGURE 12.41 Mean depletion rate (% day-1) in Arctic polar vortex in January and February 1992 (adapted from von der Gathen et al., 1995).

FIGURE 12.42 Gas-phase HNO, concentrations (O) on the 465 K isentropic surface and stratospheric temperatures (a) in the Arctic in winter 1996 (adapted from Santee et al., 1996).

ozone depletion cycles via the formation of chlorine nitrate and bromine nitrate:

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