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A model is presented in which transport rates through the lower stratosphere change in association with the height of the tropopause. The ozone distribution and column density are computed as the tropopause rises beyond its present position. Two distinct effects are noted. First, the total ozone content decreases by about 3% per kilometer rise of the tropopause from its present position. Second, there is a redistribution of ozone from statosphere to troposphere, which is quite gradual at first but suddenly becomes pronounced as the tropopause encroaches into the odd-oxygen production region. The first effect is of minor significance in the modern atmosphere where it is masked by other dynamical and chemical variations. But the second effect is potentially important, as it suggests an associated major difference in the biological environment of the distant past when the atmosphere was warmer and less rich in oxygen.

F Pasquill and F B Smith 1983 Chichester: Ellis Horwood 437 pp price £35 ISBN 0 8531 24264 In its first and second editions this book has become a standard text for those involved in the study of the dispersion of pollution in the atmosphere. This third edition maintains the high standards of its predecessors and includes a thorough coverage of material which has become available since the second edition.

Exact closed solutions of the following equation of diffusion Figure 1. where m and n are considered to be independent, are obtained for the following cases: (1) diffusion from a line-source embedded in a smooth surface; (2) diffusion from a smooth surface; (3) vapor concentration in the wake of an evaporating surface. The solutions for Cases (1) and (2) belong to the similarity-solution category. Dimensional analysis has been used in the systematic search for such solutions in as concise a manner as possible. The solution for Case (3) can be obtained from those for Cases (1) and (2). Diffusion in Couette flow is given as an example.