Saturday, 3 January 2015

CO2 STILL Greening the Earth: New Peer-reveiwed paper.

A new study published in the Proceedings of National Academy of Sciences suggests the tropical forests are using far more of the carbon (dioxide) and so growing far faster than previously believed.

Dr Schimel and his colleagues used computer models(not scientific data - Ed), satellite images, data from forest plots and photosynthetic experiments to build up a picture of how forests absorb carbon dioxide from the atmosphere.

The Paper: Effect of increasing CO2 on the terrestrial carbon cycle
  1. Joshua B. Fisher
    1. Abstract

      Feedbacks from the terrestrial carbon cycle significantly affect future climate change. The CO2 concentration dependence of global terrestrial carbon storage is one of the largest and most uncertain feedbacks. Theory predicts the CO2 effect should have a tropical maximum, but a large terrestrial sink has been contradicted by analyses of atmospheric CO2 that do not show large tropical uptake. Our results, however, show significant tropical uptake and, combining tropical and extratropical fluxes, suggest that up to 60% of the present-day terrestrial sink is caused by increasing atmospheric CO2. This conclusion is consistent with a validated subset of atmospheric analyses, but uncertainty remains. Improved model diagnostics and new space-based observations can reduce the uncertainty of tropical and temperate zone carbon flux estimates. This analysis supports a significant feedback to future atmospheric CO2 concentrations from carbon uptake in terrestrial ecosystems caused by rising atmospheric CO2 concentrations. This feedback will have substantial tropical contributions, but the magnitude of future carbon uptake by tropical forests also depends on how they respond to climate change and requires their protection from deforestation.
    2. We would dispute the first sentence of the Abstract; however, it is one further peer reviewed paper contributing to the many showing the value of CO2 to greening plant life and therefore to all life on our planet.
    3. From the UK Daily Mail (LINK)
    4. Dr David Schimel, who led the study, said
    5. 'Here, at least, is a hypothesis that provides a consistent explanation that includes both how we know photosynthesis works and what's happening at the planetary scale. All else being equal, the effect is stronger at higher temperatures, meaning it will be higher in the tropics than in the boreal forests.'
      The facts that we know:

           Atmospheric CO2 is increasing;
    6.      CO2 IS greening the planet;
    7.      Global temperatures have not risen for more than 18 years;
    8.     Global Temperatures this century have fallen slightly.

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