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Coordinated inverse and satellite-driven biological process model study of CO2 fluxes from 1957 to present

Stephen C Piper, Scripps Institution of Oceanography, scpiper@popmail.ucsd.edu (Presenting)
Ralph F Keeling, Scripps Institution of Oceanography, rkeeling@ucsd.edu
Ramakrishna Nemani, NASA AMES Research Center, Moffett Field, rnemani@arc.nasa.gov
Hirofumi Hashimoto, NASA AMES Research Center, Moffett Field, hhashimoto@arc.nasa.gov

We estimated interannual variations in regional and global net ecosystem exchange (NEE) and oceanic CO2 exchange using an inverse model, atmospheric transport model, and observations of atmospheric CO2 and C13/C12 from the Scripps network. We estimated GPP, NPP and Rh by using a production efficiency model and the NDVI product from Pathfinder, TERRA and AQUA for 1981 to present. By taking advantage of extensive measurements of CO2 which our program collected from 1957, when fossil emissions were less than 1/3 of present emissions, to 1981 on ships and several land sites, and a close proportionality of the rise in atmospheric CO2 and fossil emissions, we separated the evolving north-south gradient of atmospheric CO2 and C13/C12 caused mainly by fossil emissions from underlying natural gradients. By including satellite data and the historical CO2 data into our analysis, we were able to provide tighter constraints on the evolving suite of carbon sources and sinks than is possible using recent CO2 data alone.


NASA Carbon Cycle & Ecosystems Active Awards Represented by this Poster:

  • Award: NNG06GB98G
    Start Date: 2006-01-01
     

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