{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

3+NutrientCycles_1 - In previous episode long-term C cycle...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
In previous episode: long-term C cycle & photosynthesis negative feedback loop: vulcanism & temp.-dependent weathering reduction in [CO 2 ], increase in [O 2 ] Today: short-term C cycle & human effects, nutrient cycles
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Nutrients : elements required for development, maintenance & reproduction Carbon (C) Oxygen (O) Hydrogen (H) Nitrogen (N) Phosphorus (P) 93% of chemical composition of organisms Nutrient cycle : use, transformation, transfer & re-use of nutrient in ecosystem Difference in chemical composition: plants animals fungi bacteria 0 5 10 15 20 25 C : N ratio type of organism
Background image of page 2
Carbon cycle Atmosphere & Ocean Organisms Long-term reservoirs Short-term reservoirs Photosynthesis Respiration (soil, organic matter) (carbonate rock , fossil fuels) Reservoirs : Atmosphere Soils (3 × atmosphere) Carbonate rock (largest reservoir) Excess release : Burning of vegetation Burning of fossil fuels
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Recent changes in atmospheric [CO 2 ] seasonal variation in [CO 2 ] Science 2011, 334, 34-35 summer: photosynthesis atmospheric [CO 2 ]
Background image of page 4
Greenhouse effect higher [CO 2 ] => increased radiation of heat towards planet’s surface consequences: - higher mean temp., higher variability - increase energy in atmosphere & oceans - melting ice, raising sea levels - change patterns of precipitation, vegetation - change prevailing conditions (re: adaptation, acclimatization)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
On August 4, 2009: Seattle and the Pacific Northwest are frying under a heat wave.
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}