L10_More_Carbon_Cycle

Figure 138 text co2 variability on hundred million

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Unformatted text preview: regulated’ is atmospheric CO2? (Does CO2 concentraNon oscillate wildly on short Nmescales?) Is the system dominated by posiNve or negaNve feedbacks? hmp://keelingcurve.ucsd.edu/ hmp://keelingcurve.ucsd.edu/ CO2 variability on decadal and seasonal Nmescales The “Keeling Curve” Charles Keeling Nine Fluxes: What are they? 1a: 63 Gt/y 8: 0.12 Gt/y 7: 0.12 Gt/y land bioshpere (2200 Gt) 6: 0.4 Gt/y atmosphere (800 Gt) lithosphere (78,000,000 Gt) 1b: 4 5 Gt/ y 2b: 4 5.2 G t/y hydrosphere (38,400 Gt) CO2 variability on decadal and seasonal Nmescales The “Keeling Curve” Charles Keeling We know that only ~1/2 of fossil fuel carbon stays in the atmosphere. Where is the rest going? Either Biosphere or Oceans… Records of past CO2 levels from gas trapped in polar ice One possible negaNve feedback mechanis...
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