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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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Welcome to ECOSYS

UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

The N-TWO-O project

Description of the N-TWO-O project

Emissions de N2O en 2007
The N-TWO-O project was funded by the French National Research Agency (ANR) from 2007 to 2010. Its overall goal was to gain insight into the biogenic sources of nitrous oxide (N2O) and into the fate of this potent greenhouse gas in the atmosphere on regional to global scales.

Increasing emissions of N2O will soon make it the third most important anthropogenic greenhouse gas. A positive perspective is that anthropogenic N2O emissions can be reduced cost-efficiently. This would help fulfill the reduction aims set by the Kyoto protocol. Large uncertainties exist where exactly agricultural practices can be most efficiently changed.

An improved understanding of the observed ambient air N2O concentration variability would help to control regional scale hot-spots of N2O emissions. This project aimed at substantially improving the monitoring and modelling of N2O emissions from natural and anthropogenic sources in France and Europe. It combined high-quality ambient air measurements with regional and global modelling of transport and removal of N2O in order to analyse the observed N2O variability in terms of emissions and transport.
The project used integrated vegetation and soil modelling to improve regional emission estimates, using ORCHIDEE-CN (a generic ecosystem model) and CERES-EGC. High-resolution N2O emission maps from ecosystems were derived for the year 2007 over Europe with a zoom-over in France. These maps were fed into the atmospheric chemistry-transport model CHIMERE, and tested by comparing the CHIMERE simulations with time series of N2O concentrations measured at various heights in two locations. Ecosystem models tended to under-estimate the source strength of agricultural soils, despite successful tests against a range of plot-scale emission data sets. This lead to improvements in the indirect emissions of N2O by land surface models. Other methods such as Radon tracing and model inversion were used to derive estimates for biogenic N2O sources.

See also

The projects's web site including results and on-line data.

The IMAGINE projects , a sequel to N-TWO-O focused on the greenhouse gas balance of bioenergy pathways, at regional scale.