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Biogeochemical Cycles

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Page 1: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Biogeochemical Cycles

Page 2: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

3 Fundamental Laws of Nature

• Conservation of Matter

• 1st Law of Thermodynamics(Conservation of Energy)

• 2nd Law of Thermodynamics(Entropy)

Page 3: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Earth:Matter does not come and

go

Earth is aClosedSystem

to Matter

Page 4: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Biogeochemical Cycles:Reservoirs & Pathways

Atmosphere

HydrosphereLithosphere

Biosphere

Page 5: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Some Major Cycles of Matter

•Water Cycle•Rock Cycle•Chemical Cycles

•Carbon•Nitrogen•Phosphorous•Sulfur

Page 6: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Carbon Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

Page 7: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Carbon Cycle: Reservoirs

Atmosphere

HydrosphereLithosphere

Biosphere

1x(= 7.3x1017 grams

carbon)

3x

55x35,000x

Page 8: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Carbon Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

Photosynthesis

Respiration& Decay

Page 9: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Carbon Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

Photosynthesis

Respiration& Decay

Burial &Lithification

Weathering& Volcanism

Dissolution

PhotosynthesisBurial &Lithification

Exsolution

Page 10: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Carbon Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

HumanImpacts

Burning fossil fuels:Increased combustion

Deforestation:Decrease Photosynthesis

Increase Respiration

Net Effect:Increase in Carbonin Atmosphere

Page 11: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Atmospheric Carbon Dioxide

northernsummer

northernwinter

Page 12: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics
Page 13: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Nitrogen Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

Nitrogen fixation:• bacteria• lightning

Waste &Decomposition

Denitification:bacteria

Erosion

Absorption

Page 14: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Nitrogen-Fixing

Bacteria in Root

Nodules

Page 15: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Nitrogen Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

Nitrogen fixation:• industrial (fertilizer)

• combustion

Increased Erosion

HumanImpacts

Net Effect:Increase in Nitrogenin water & soil

Page 16: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Phosphorous Cycle

Atmosphere

HydrosphereLithosphere

Biosphere

Never enters the atmosphere

Waste &Decomposition

Weathering & Erosion

Absorption

SedimentationAbsorption

Page 17: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Phosphorous Cycle

HydrosphereLithosphere

Biosphere

Mining, use (fertilizer, detergent, etc.)& increased runoff

HumanImpacts

Net Effect:Increase in phosphorous in water &“algal blooms”; Depletion in soils

More Phos. for organisms

Page 18: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Eutrophication

Page 19: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Impact:Red Tide

Page 20: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Sulfur Cycle

Atmosphere

Hydrosphere Lithosphere

Biosphere

Volcanoes& Weathering

Waste &Decomposition

Deep Sea Vents

Absorption

Sedimentation

Absorption

Precipitation

“Evaporation” Weathering

BacteriaRelease

BacteriaAbsorption

Page 21: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

Sulfur Cycle

Atmosphere

Hydrosphere Lithosphere

Biosphere

BurningFossil Fuels

Precipitation”Acid Rain

HumanImpacts

Net Effect:Increase in atmosphere (health effects) and acid rain

Page 22: Biogeochemical Cycles. 3 Fundamental Laws of Nature Conservation of Matter 1st Law of Thermodynamics (Conservation of Energy) 2nd Law of Thermodynamics

What is the ultimate interface of all 4 reservoirs

for these cycles?

Soil