Abstract
Estimates of sulphur in air and that deposited by air and rain have been developed for each 10-km square of the National Grids of Great Britain and Ireland, with the aim of presenting values in reasonable detail, especially for country areas where few measurements exist. The sulphur dioxide in the air and the dry deposition of sulphur from the air were derived from a mathematical model linking sulphur source strengths and specifically measured sulphur dioxide in air at certain sites. The wet deposition of sulphur by rain was derived from an empirical relationship between rainfall amounts and sulphur in rain samples. Extra sulphur contributions fròm sea-spray and from particulates from nearby combustion sources were incorporated in the estimates, but with more uncertainty. The areas around large towns in England receive a total more than 50 kg S ha −1 year −1 on average, whereas the areas receiving least annual total sulphur deposition (less than 15 kg S ha −1 year −1 on average) are in central Ireland and northeast Scotland. Some parts of southwest England receive similar small amounts over the six summer months.
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