Carbon Mitigation Initiative
CMI

Ninth Year Annual Report: Carbon Science

The Science Group, composed of the Pacala, Sarmiento, Morel and Bender teams, investigates the impacts of climate change on the carbon cycle using both observational data and models.

Highlights

  • Nitrogen limitation appears to explain weak or absent CO2 fertilization in the temperate and boreal realms while high nitrogen fixation rates support a strong CO2 fertilization sink in the tropics.
  • A terrestrial model with nitrogen cycling is the first to explain both the geographical distribution and history of terrestrial CO2 sinks.
  • A new statistical approach has been developed to investigate the timing and cause of a recent increase in the terrestrial CO2 sink.
  • Work on air-sea fluxes shows the importance of seasonal changes in CO2 uptake
  • Studies of the impacts of ocean acidification on marine phytoplankton show effects on iron uptake, growth efficiency, and growth rate.
  • A new instrument has been developed to continuously measure dissolved inorganic in surface seawater to improve estimates of ocean CO2 uptake and fertility.
  • Recently obtained samples from Antarctica may extend the ice core record much further back in time.

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Last update: February 17 2011
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