Carbon and Nitrogen Cycling Robert F. Chen UMassBoston Environmental Coastal and Ocean Sciences...
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Transcript of Carbon and Nitrogen Cycling Robert F. Chen UMassBoston Environmental Coastal and Ocean Sciences...
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Carbon and Nitrogen Cycling
Robert F. ChenUMassBoston
Environmental Coastal and Ocean Sciences(ECOS)
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Carbon
• Fourth most abundant element in the universe
• Basis for life• 4 bonds• Forms complex
molecules• Gaseous form
Buckminster Fullerene
Megaphone
Bastadin-5Moronic Acid
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Photosynthesis
• Where does the mass of a tree come from?
• CO2 + H2OCH2O + O2
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Global Productivity
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Respiration
• Mitochondria, bacteria, fires, combustion engines
• O2 + CH2OCO2 + H2O
• Fossil Fuels burned at 20,000 times natural rates of oxidation
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CO2 Emissions
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Atmospheric Measurements
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“Missing Sink” of Atmospheric CO2(in Gigatons Carbon—1015gmC)
• Fossil Fuel Burning =6.0+/- 0.5• Deforestation =0.9+/-0.7
• Atmospheric Increase =3.2+/-0.1• Oceanic Uptake =2.0 +/-0.8• “Missing Sink” =1.7 +/1.2
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Mass Balance
• Total mass is always conserved
• Each element is also conserved in a closed system
• Can you design a closed system that is sustainable indefinitely?
• Eco-sphere.com
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Neponset River Estuary
• Urban: Largest salt marsh in Boston
• Small: ~6km long; ~100m wide
• <5m deep, 3m tidal range
• Oldest dam in the country
• Extensive salt marsh and mudflats
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Granite Ave. Bridge
Gulliver’s Creek
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Minishuttle Instrumentation
Minishuttle underway at ~4 kts
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Cycles are linked
• CO2 + H2O CH2O + O2
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Biosphere 2
• http://www.bio2.edu/virtualtour/beach.htm
• 7 people, O2 began to drop
• Why?
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Nitrogen Cycle
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Needs
• Amino Acidsproteins
• Nucleic Acids
• Chlorophyll
• Carbon to Nitrogen ratio
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Sources
• Nitrogen Fixing bacteria– Legumes– Clover– Cyanobacteria
• Lightning• Haber Process (factory fertilizer production)• Internal combustion engines (cars)• Mankind has doubled N-inputs to coastal
areas eutorphication
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Fall Colors
• Chlorophyll-N recalled
• Accessory pigments shown
• Huge loss of C, but not N
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Lawn calculation
• If you add 1 pound of nitrogen fertilizer to your lawn, how many pounds of lawn clippings must you carry away?
• Water
• Carbon/Nitrogen ratio
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Frameworks
• Elements and compounds
• Mixtures and pure substances (solutions)
• Conservation of Mass
• Energy and living things
• Changes of ecosystems over time/affect of mankind