Journal article

Atmospheric constraints on gross primary productivity and net ecosystem productivity: Results from a carbon-cycle data assimilation system

EN Koffi, PJ Rayner, M Scholze, C Beer

GLOBAL BIOGEOCHEMICAL CYCLES | AMER GEOPHYSICAL UNION | Published : 2012

Abstract

This paper combines an atmospheric transport model and a terrestrial ecosystem model to estimate gross primary productivity (GPP) and net ecosystem productivity (NEP) of the land biosphere. Using atmospheric CO 2 observations in a Carbon Cycle Data Assimilation System (CCDAS) we estimate a terrestrial global GPP of 146 ± 19 GtC/yr. However, the current observing network cannot distinguish this best estimate from a different assimilation experiment yielding a terrestrial global GPP of 117 GtC/yr. Spatial estimates of GPP agree with data-driven estimates in the extratropics but are overestimated in the poorly observed tropics. The uncertainty analysis of previous studies was extended by using ..

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Grants

Awarded by European Commission through the IMECC Integrated Infrastructure Initiative


Awarded by ARC


Awarded by Natural Environment Research Council


Funding Acknowledgements

We acknowledge the financial support of the European Commission through the IMECC Integrated Infrastructure Initiative (I3) project under the 6th Framework Program (contract 026188). PR is in receipt of an ARC Professorial Fellowship (DP1096309). We would like to sincerely thank both reviewers for thoughtful, thorough and constructive comments on the manuscript.