Acid deposition accumulation of potential acid-forming particles on a surface acids can result from natural causes
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1 1 Air Quality Issues: Part 2 - Acid Deposition, Greenhouse Gases EVPP 111 Lecture Dr. Largen 2 Air Quality Issues Air Pollution Indoor Air Pollution Acid Deposition Greenhouse Gases & Global Warming 3 Air Quality Issues: Acid Deposition Acid deposition accumulation of potential acid-forming particles on a surface acids can result from natural causes human activities 4 Air Quality Issues: Acid Deposition Acid deposition combustion produces sulfur dioxide and oxides of nitrogen converted to sulfuric acid and nitric acid in presence of water and oxidizing agents 5 Figure 17.9: Acid Deposition 6 Air Quality Issues: Acid Deposition acid-forming reactions classified as wet (precipitation) reactions occur in atmosphere acids come to earth in precipitation dry (deposition) particles related to acid settle onto a surface reactions occur when these materials mix with water 7 Air Quality Issues: Acid Deposition collective term used to refer to all acid forming processes 1
2 ph of normal rain between 5.6 and 5.7 slightly acidic due to formation of carbonic acid when carbon dioxide reacts with atmospheric moisture 8 Figure: Typical ph Values 9 Air Quality Issues: Acid Deposition scope of problem global high acid rain damage» Canada, England, Germany, France, Scandinavia, US can have concentration of acid a thousand times higher than normal rain in NH, 1969, ph=2.1 ~ lemon juice rain in NE US and Ontario has average ph= Figure: US Acid Precipitation 11 Air Quality Issues: Acid Deposition human-made materials erosion of buildings and monuments made of limestone corrosion of metal surfaces terrestrial 12 Air Quality Issues: Acid Deposition terrestrial forests in NE US» ~50%mortality of red spruce in some areas forests in central Europe» death of ~14.8 million acres of trees 13 Air Quality Issues: Acid Deposition terrestrial link between tree decline and acid rain» soils become acidic» aluminum interferes with ability of plant roots to absorb nutrients 2
3 14 Air Quality Issues: Acid Deposition healthy lakes have ph ~6.0 increase in acidity leads to progressive loss of many kinds of organisms 15 Air Quality Issues: Acid Deposition experimental acidification of lakes» ph 5.5, many desirable species of fish are lost» ph 5, only a few starving fish remained» ph 4.5, lake was nearly sterile 16 Air Quality Issues: Acid Deposition scope of problem» 14,000 lakes in Canada» 11,000 lakes in US» Scandinavia 17 Air Quality Issues: Acid Deposition extent of damage to ecosystems depends on nature of bedrock in area proximity to acid-forming pollution sources 18 Air Quality Issues: Acid Deposition 3
4 extent of damage to ecosystems depends on nature of bedrock in area soils from igneous rock» can t buffer acid rain soils from sedimentary rock» such as limestone» release bases that neutralize acid rain 19 Air Quality Issues: Acid Deposition eastern Canada and NE US prevailing west to east winds soils have high proportion of granite rock 20 Fig Figure: Acid Rain Damage 22 Air Quality Issues Air Pollution Indoor Air Pollution Acid Deposition Greenhouse Gases & Global Warming 23 Air Quality Issues: Greenhouse Gases & Global Warming Emission of gases to atmosphere increasing due to human activities activities burning fossil fuels deforestation industrial processes gases carbon dioxide chlorofluorocarbons nitrous oxide methane 24 Air Quality Issues: Greenhouse Gases & Global Warming in 1980s, concern that earth may be getting warmer 4
5 in past 100 years, earth s average temperature has C sea level has 10-25cm 1998 was warmest year on record correlation between temperature increase and greenhouse gases human activity increases amounts of these gases 25 Air Quality Issues: Greenhouse Gases & Global Warming Areas of concern related to global warming and climate change human health effects rising seas levels disruption of water cycle changing forests and natural areas challenges to agriculture and food supply 26 Air Quality Issues: Greenhouse Gases & Global Warming what causes global warming? several gases in atmosphere transparent to light allowing sunlight to penetrate atmosphere and be absorbed by earth s surface absorb infrared radiation sunlight energy that is absorbed by earth s surface is re-radiated as infrared radiation» which is absorbed by gases 27 Air Quality Issues: Greenhouse Gases & Global Warming what causes global warming? gases in atmosphere allow heat to enter (as sunlight) but retard loss of heat producing process called greenhouse effect» atmospheric gases contributing to effect are called greenhouse gases 28 Air Quality Issues: Greenhouse Gases & Global Warming what causes global warming? greenhouse gases most important are carbon dioxide chlorofluorocarbons (CFC) methane nitrous oxide 29 Figure 17.17: Greenhouse effect 30 Air Quality Issues: Greenhouse Gases & Global Warming Carbon dioxide most abundant greenhouse gas produced as waste product of cellular respiration in living organisms 5
6 energy production levels have been increasing for 40 years 31 Air Quality Issues: Greenhouse Gases & Global Warming Carbon dioxide reducing emissions would help slow global warming methods to reduce emissions increase efficiency of energy usage increase amount of carbon dioxide removed from atmosphere» via photosynthesis which requires it 32 Figure: Carbon dioxide concentration in Hawaii 33 Figure: Carbon dioxide levels Air Quality Issues: Greenhouse Gases & Global Warming Chlorofluorocarbons present in atmosphere in minute quantities extremely efficient greenhouse gases ~15,000 times more efficient at retarding heat loss than is carbon dioxide entirely the result of human activity refrigerant gases in refrigerators and air conditioners cleaning solvents propellants in aerosol containers expanders in foam products 36 Air Quality Issues: Greenhouse Gases & Global Warming Chlorofluorocarbons in 1970s, CFCs linked to depletion of ozone layer located in stratosphere absorbs most ultraviolet radiation that is potentially damaging to life reactive chlorine is released when CFCs are destroyed after reaching upper atmosphere can enter into reactions that deplete ozone leading to increase in amount of UV radiation reaching earth 37 Figure: Ozone destruction 38 Air Quality Issues: Greenhouse Gases & Global Warming Methane enters atmosphere primarily from biological sources released by bacteria» abundant in wetlands and rice fields» in guts of termites and ruminant animals (such as cattle) some enters from fossil fuel sources 6
7 39 Air Quality Issues: Greenhouse Gases & Global Warming Nitrous oxide minor component of greenhouse gases enters atmosphere primarily from fossil fuels and fertilizers 40 The End 7
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