The uptake and hydrolysis of N2Os on pure liquid water appears to be about the same as for sulfuric acid-water mixtures, ranging from about 0.01 to 0.06 over the temperature range from 262 to 293 K (e.g., Van Doren et al., 1990; Kirchner et al., 1990; George et al., 1994). It is also noteworthy that similar reactions of N2Os occur with anionic and cationic water clusters (Wincel et al., 1994, 1995).

Dentener and Crutzen (1993) have modeled the impact on a global scale of the uptake and hydrolysis of N2Os and N03 into aerosols in the troposphere. Both species were assumed to be taken up and hydrolyzed with equal reaction probabilities of O.f. Figure 7.16 shows the fraction of HN03 (/IINO,) calculated to be formed in the month of January by the combination of reactions (47) and (48),

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