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FIGURE 6.32 Measured concentrations of H02 + R02 as a function of (a) square root of ozone photolysis rate {/(O'D)}05 and (b) J(O'D) for a clean marine air mass at Cape Grim, Tasmania. Lines are guides for the eye only (adapted from Penkett et al, f997).

FIGURE 6.32 Measured concentrations of H02 + R02 as a function of (a) square root of ozone photolysis rate {/(O'D)}05 and (b) J(O'D) for a clean marine air mass at Cape Grim, Tasmania. Lines are guides for the eye only (adapted from Penkett et al, f997).

there should be a negative correlation between 03 and peroxides, which has indeed been observed to be the case in remote regions (e.g., see Penkett et al., 1995).

The relationship between the peroxy radical concentration and the ozone photolysis rate constant for these higher NO conditions can be again approximated using steady-state analysis (Penkett et al., 1997; Carpenter et al., 1997). While OH is recycled in its reactions with CO and CH4 via H02, it is permanently removed at higher NOx concentrations by the reaction of OH with N02, forming nitric acid:

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