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Figure 3.6 Contours of annually averaged (a) O, loss rate (in KF molecules em 3 s ') and (b) O, lifetime with respect to loss (1//.) (in days). These calculations are from the Goddard two-dimensional climatologieal circulation model [73].

P,; and L[OJ are equal when averaged over 24 h; the system is therefore in the diurnal steady state. Above ~2 hPa, the lifetime of O, is much less than a day, and instantaneous production and loss of O, can be considered equal throughout the day; the system is therefore in photochemical steady state.

Figures 3.7 and 3.8 show the contributions of the various catalytic cycles to the

Figure 3.7 Twenty-four hour average Ot production and loss rates for the various catalytic cycles. Calculated for 35°N, September conditions. (After Ostcrman el at. [75], Figure 2.)

Ox loss rate (molecules/cm3/s)

Figure 3.7 Twenty-four hour average Ot production and loss rates for the various catalytic cycles. Calculated for 35°N, September conditions. (After Ostcrman el at. [75], Figure 2.)

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