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Journal Article

Mean annual GPP of Europe derived from its water balance

MPS-Authors
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Beer,  C.
Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Reichstein,  M.
Research Group Biogeochemical Model-data Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society;

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http://dx.doi.org/10.1029/2006GL029006
(Publisher version)

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Citation

Beer, C., Reichstein, M., Ciais, P., Farquhar, G. D., & Papale, D. (2007). Mean annual GPP of Europe derived from its water balance. Geophysical Research Letters, 34(5), L05401. doi:10.1029/2006GL029006.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-D4CD-0
Abstract
On local scale, the eddy covariance technique is suited to estimate gross primary production (GPP). Scaling up such observations to the regional and continental level, however, remains a challenge. Here, we show that there is a surprisingly robust stoichiometric relationship between vegetation CO2 and H2O fluxes, mediated by vapor pressure deficit (VPD), across many different forest vegetation types. This relationship is used to provide a data-driven estimate of Europe's GPP from its water balance. Namely, watershed-wide evapotranspiration (ET), as derived from precipitation (P) and river runoff (R), is multiplied by the ratio of GPP to ET as derived from eddy covariance measurements (water-use efficiency, WUE). In doing so, GPP of Europe is estimated to range between 3.9 and 5.8 PgC/a (median 5 PgC/a). Such GPP estimate is an important independent benchmark for large-scale ecosystem models and may be extended to global scale when relevant data becomes available. [References: 27]