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.
- 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.