Oceanic Carbon Cycle - PowerPoint PPT Presentation

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Oceanic Carbon Cycle

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Oceanic Carbon Cycle Upwelling brings nutrients (e.g. PO4) to euphotic zone Photosynthesis (Dissolved Inorg Particulate Organic Matter) Recycling and consumption ... – PowerPoint PPT presentation

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Title: Oceanic Carbon Cycle


1
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2
Oceanic Carbon Cycle
  • Upwelling brings nutrients (e.g. PO4) to
    euphotic zone
  • Photosynthesis (Dissolved Inorg ? Particulate
    Organic Matter)
  • Recycling and consumption
  • Sinking of particulate matter
  • Remineralization (POM ? dissolved inorganic
    forms)

S. Doney
3
Marine Productivity
  • Upwelling brings from
  • below the mixed layer
  • Nutrients and DIC
  • ? increase pCO2
  • Cold water
  • ?decrease pCO2

Chavez et al.
4
From the Atmospheres Perspective
90 Pg C/yr
5
Terrestrial Carbon Cycle
  • Growth, mortality, decay
  • Population ages
  • Photosynthesis (climate, CO2, soil H2O, resource
    limitation)
  • Decay (T, soil H2O,..)

6
Impact on Atmospheric CO2
  • Seasonal asynchrony between photosynthesis and
    decomposition
  • ? net fluxes of CO2 to and from atm
  • ? seasonal cycle of CO2 in atm
  • Annual imbalance ? carbon source/sink

7
NOAA Observatories
Pt Barrow, AK
MaunaLoa
South Pole
American Samoa
8
Atm CO2 measurements
  • NOAA-CMDL
  • 100 sites at remote marine locations
  • Long-term increase
  • Seasonal cycle
  • N-S gradient

9
Atmospheric CO2 Budget
Land ocean sinks 50 of FF
emission sensitive to climate perturbations
10
Total CO2 Emission 1997
11
Amazon-fishbone
12
PerCapita CO2 Emission 1997
13
Depletion of Atm Oxygen
  • Burning of Fossil Fuels ? long term decrease
  • Decomposition of Organic Carbon ? seasonal cycle

14
Vostok a station on Antarctica Analysis of
ice and gas bubbles trapped in ice yields past
climate history of last 460,000 years
15
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16
Annual GHG Emissions per Vehicle
17
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