Read e-book online Acid Rain: Report number 14 PDF

By Watt Committee on Energy Publications

ISBN-10: 020321031X

ISBN-13: 9780203210314

ISBN-10: 0203289854

ISBN-13: 9780203289853

ISBN-10: 0946392153

ISBN-13: 9780946392155

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These included a remarkably large increase in senescence of poplar caused by the addition of a level of Oa within the maximum natural background concentration to an SO2/NO2 mixture at concentrations that are representative of large areas of western Europe. However, recent work has highlighted the complexities of interactions between O3 and SO2/NO2 mixtures; experiments with a range of species have demonstrated additive, synergistic, and antagonistic effects on growth. Tentative conclusions are that at lower concentrations of Oa, the effects of NO2/SO2 mixtures are generally enhanced, whereas suppression of such effects tends to take place at higher O3 concentrations.

1 Long-range transport of pollution In urban areas, local pollution dominates air concentrations and dry deposition. Wet deposition values, which are relatively much smaller than dry, may depend more on sources some distance away, since local pollution will generally have had insufficient time to diffuse upwards into the clouds and get taken up into the droplets of precipitation. In rural areas, remote sources normally make a larger relative contribution. The fraction of the total deposition that originates from outside the country depends very much on the size of the country and on the magnitude and location of its emissions.

Comes in frequent rains—in less concentrated amounts— in southwesterly flows off the Atlantic. The origin of this pollution may be naturally-occurring oceanic sources or it may be very distant sources in North America or elsewhere (including Europe, from which the pollution may have travelled out over the Atlantic and then returned). 3 Effect of single sources on total-deposition field It is not easy to say how a single source affects the total deposition field. 5) is by-passed and if it is assumed that each source produces a deposition field independent of every other source.

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Acid Rain: Report number 14 by Watt Committee on Energy Publications


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