7.5 - Acid Deposition

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7.5 - Acid Deposition

  1. 1. Acid Deposition Acid deposition involves the deposition of both wet and dry acidic components
  2. 2. Definitions <ul><li>Wet deposition (acid rain) – rain or any other form of precipitation the is acidic. “Clean” or unpolluted precipitation has a ph of around 5.2; anything below this can be considered acidic. </li></ul><ul><li>Dry deposition – acidified particles and gases which are deposited directly from the air. </li></ul>
  3. 3. Why do we get acid deposition? <ul><li>The primary causes are the emissions of sulphur dioxides and nitrogen oxides into the atmosphere </li></ul><ul><li>These emissions lead to direct dry deposition or react in the air to produce sulphuric and nitric acids (acid rain) </li></ul><ul><li>These emissions come from power generation, vehicles and factories </li></ul><ul><li>Other sources include wildfires and volcanoes </li></ul>
  4. 6. Impacts of Acid Rain <ul><li>Acid rain can impact; </li></ul><ul><li>Surface water (rivers, lakes etc.) and aquatic animals </li></ul><ul><li>Soils </li></ul><ul><li>Forests and vegetation </li></ul><ul><li>Human health </li></ul><ul><li>Building and the urban environment </li></ul>
  5. 7. A Trans-national Problem <ul><li>The impact of acid deposition is therefore focused on areas with high levels of industrial and other pollutants – Western Europe and the USA for example. </li></ul><ul><li>Increasingly acid deposition will be a problem in rapidly developing areas such as China </li></ul><ul><li>Scandinavia has been badly affected by acid rain – why? </li></ul>
  6. 8. Management Options <ul><li>These include; </li></ul><ul><li>Technological fix </li></ul><ul><li>International treaties </li></ul><ul><li>Emissions trading </li></ul>
  7. 9. You should; <ul><li>Make notes on the link between pollution and the acid deposition that results (a flow diagram perhaps) </li></ul><ul><li>Research examples and case studies of the impacts of acid rain (e.g. Scandinavia) </li></ul><ul><li>Research and evaluate the strategies used to manage the problem; show an awareness of the trans-national nature of acid rain </li></ul>

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