N N M No M

where (8kT/nmN2o5)^2 is the molecular mean speed of N205, mN2o5 is the N205 molecular mass, and Ap is the aerosol surface area per unit volume (cm2 cm"3). Thus,

Stratospheric Chemistry

FIGURE 5.24 Variation of stratospheric aerosol surface area with altitude as inferred from satellite measurements. Maximum in surface area concentration occurs at about 18-20 km. [Reprinted from McElroy et al. (1992) with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, UK.]

Surface Area, 10" cm cm-3

FIGURE 5.24 Variation of stratospheric aerosol surface area with altitude as inferred from satellite measurements. Maximum in surface area concentration occurs at about 18-20 km. [Reprinted from McElroy et al. (1992) with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, UK.]

the reaction occurs at a rate governed by that at which N205 molecules strike the aerosol surface area times the amount of surface area times the reaction efficiency. The HN03 formed in this reaction is assumed to be released to the gas phase immediately since the midlatitude stratosphere is undersaturated with respect to

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