AustralieFrV1, Main, Merge, bibRecord, 009E93

Mean annual GPP of Europe derived from its water balance

Identifieur interne : 009E93 ( Main/Merge ); précédent : 009E92; suivant : 009E94

Mean annual GPP of Europe derived from its water balance

Auteurs : C. Beer [Allemagne] ; M. Reichstein [Allemagne] ; P. Ciais [France] ; G. D. Farquhar [Australie] ; D. Papale [Italie]

Source :

Geophysical research letters [ 0094-8276 ] ; 2007.

RBID : Pascal:07-0224361

Descripteurs français

Pascal (Inist)
- Europe, Bilan eau, Productivité primaire, Echelon régional, Végétation, Pression vapeur, Forêt, Bassin versant, Evapotranspiration, Précipitation atmosphérique, Rivière, Ruissellement eau sol, Tourbillon, Covariance, Efficacité, Ecosystème, Modèle, Echelle planétaire.
Wicri :
- topic : Forêt.

English descriptors

KwdEn :
- Europe, Planetary scale, Regional scope, Runoff, Vapor pressure, Vortex, atmospheric precipitation, covariance, drainage basins, ecosystems, efficiency, evapotranspiration, forests, models, primary productivity, rivers, vegetation, water balance.

Abstract

[1] 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.

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Pascal:07-0224361

Le document en format XML

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<term>drainage basins</term>
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<term>Pression vapeur</term>
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<term>Bassin versant</term>
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<term>Précipitation atmosphérique</term>
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<front><div type="abstract" xml:lang="en">[1] 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 CO<sub>2</sub>
 and H<sub>2</sub>
O 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.</div>
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Mean annual GPP of Europe derived from its water balance

Mean annual GPP of Europe derived from its water balance

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri