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7.5 - Acid Deposition
 

7.5 - Acid Deposition

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    7.5 - Acid Deposition 7.5 - Acid Deposition Presentation Transcript

    • Acid Deposition Acid deposition involves the deposition of both wet and dry acidic components
    • Definitions
      • 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.
      • Dry deposition – acidified particles and gases which are deposited directly from the air.
    • Why do we get acid deposition?
      • The primary causes are the emissions of sulphur dioxides and nitrogen oxides into the atmosphere
      • These emissions lead to direct dry deposition or react in the air to produce sulphuric and nitric acids (acid rain)
      • These emissions come from power generation, vehicles and factories
      • Other sources include wildfires and volcanoes
    •  
    •  
    • Impacts of Acid Rain
      • Acid rain can impact;
      • Surface water (rivers, lakes etc.) and aquatic animals
      • Soils
      • Forests and vegetation
      • Human health
      • Building and the urban environment
    • A Trans-national Problem
      • 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.
      • Increasingly acid deposition will be a problem in rapidly developing areas such as China
      • Scandinavia has been badly affected by acid rain – why?
    • Management Options
      • These include;
      • Technological fix
      • International treaties
      • Emissions trading
    • You should;
      • Make notes on the link between pollution and the acid deposition that results (a flow diagram perhaps)
      • Research examples and case studies of the impacts of acid rain (e.g. Scandinavia)
      • Research and evaluate the strategies used to manage the problem; show an awareness of the trans-national nature of acid rain