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0.0 0.2 0.4 0.6 0.8 1.0 Fraction of HOx production

FIGURE 6.42 Fraction of HOA from each radical source as a function of altitude over the tropical Atlantic Ocean (adapted from Lee et al, 1998).

for the overall "instantaneous" lifetime of an organic with respect to these three oxidants acting together at the same time, (b) Calculate the overall lifetime of this compound at concentrations of OH of 4 x fO4 molecules cm"3, of 03 of 50 ppb, and of N03 of 100 ppt, which might be typical of a nighttime situation, using the rate constants given in this chapter.

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