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Biogeochemical Cycles

Published byMarvin Lynch Modified over 5 years ago

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Presentation on theme: "Biogeochemical Cycles"— Presentation transcript:

1 Biogeochemical Cycles

2 3 Fundamental Laws of Nature
Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics (Entropy)

3 Earth: Matter does not come and go
Earth is a Closed System to Matter

4 Biogeochemical Cycles: Reservoirs & Pathways
Atmosphere Biosphere Lithosphere Hydrosphere

5 Some Major Cycles of Matter
Water Cycle Rock Cycle Chemical Cycles Carbon Nitrogen Phosphorous Sulfur

6 Carbon Cycle Atmosphere Biosphere Lithosphere Hydrosphere

7 Carbon Cycle: Reservoirs
Atmosphere 1x (= 7.3x1017 grams carbon) Biosphere 3x 55x 35,000x Lithosphere Hydrosphere

8 Carbon Cycle Atmosphere Biosphere Lithosphere Hydrosphere
Respiration& Decay Photosynthesis Biosphere Lithosphere Hydrosphere

9 Carbon Cycle Atmosphere Biosphere Lithosphere Hydrosphere
Respiration& Decay Photosynthesis Dissolution Weathering & Volcanism Exsolution Biosphere Burial & Lithification Lithosphere Photosynthesis Burial & Lithification Hydrosphere

10 Carbon Cycle Human Impacts Atmosphere Biosphere Net Effect:
Deforestation: Decrease Photosynthesis Increase Respiration Atmosphere Burning fossil fuels: Increased combustion Biosphere Net Effect: Increase in Carbon in Atmosphere Lithosphere Hydrosphere

11 Atmospheric Carbon Dioxide
northern winter northern summer

12

13 Nitrogen Cycle Atmosphere Biosphere Lithosphere Hydrosphere
Denitification: bacteria Biosphere Nitrogen fixation: bacteria lightning Absorption Waste & Decomposition Erosion Lithosphere Hydrosphere

14 Nitrogen-Fixing Bacteria in Root Nodules

15 Nitrogen Cycle Human Impacts Atmosphere Biosphere Net Effect:
Increase in Nitrogen in water & soil Nitrogen fixation: industrial (fertilizer) combustion Increased Erosion Lithosphere Hydrosphere

16 Phosphorous Cycle Atmosphere Biosphere Lithosphere Hydrosphere
Never enters the atmosphere Atmosphere Biosphere Absorption Waste & Decomposition Weathering & Erosion Lithosphere Hydrosphere Absorption Sedimentation

17 Phosphorous Cycle Human Impacts Biosphere Net Effect:
Increase in phosphorous in water & “algal blooms”; Depletion in soils Mining, use (fertilizer, detergent, etc.) & increased runoff Lithosphere Hydrosphere More Phos. for organisms

18 Eutrophication

19 Impact: Red Tide

20 Sulfur Cycle Atmosphere Biosphere Lithosphere Hydrosphere Bacteria
Absorption Bacteria Release Biosphere Volcanoes & Weathering Absorption Precipitation Waste & Decomposition Weathering “Evaporation” Sedimentation Lithosphere Hydrosphere Absorption Deep Sea Vents

21 Sulfur Cycle Human Impacts Atmosphere Biosphere Net Effect:
Increase in atmosphere (health effects) and acid rain Precipitation” Acid Rain Burning Fossil Fuels Lithosphere Hydrosphere

22 What is the ultimate interface of all 4 reservoirs for these cycles?
Soil

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