Skip to Main content Skip to Navigation
Theses

Modélisation biophysique des émissions de NO par les sols agricoles, spatialisation et impact sur la chimie troposphérique à l'échelle régionale

Abstract : Biogenic inventories used in atmospheric chemistry transport models (CTM) are simplified, because they are based on the application of emission factors which poorly integrate the influence of environmental conditions that govern NO emissions. The aim of this work was to improve the prediction of NO emissions from agricultural soils for use in the CHIMERE CTM. It is based on the agro-environmental model CERES-EGC, which allows to simulate the dynamics of nitrogen and water in the soilcrop system. The implementation of a parametrization of NO emissions and its tests with experimental data, showed that taking into account the first centimeters of soil to describe heat and matter transfers is crucial. The simulations of daily NO emissions showed a strong seasonal variability due to the climate and the crop practices conditions. We obtained a total of 1-4 kg N-NO ha-1, which represents an emission factor (E.F.) of 1-2% in relation to fertilizer doses. Next, we realized a map of NO emissions for the Ile de France area near Paris, using CERES-EGC, geographical information systems and a range of databases. The spatial distribution of soil types in the area induced an important variability of NO emissions. This work allows to quantify the total rates of NO emissions around 2.7 kt N-NO for 14 months and an averaged emission of 5.1 kg N-NO ha-1 (E.F. Of 3.4%). Lastly, maps on NO emissions were implemented into the regional version of CHIMERE in order to estimate the role of NO emissions into the production of O3. Results showed NO emissions contribute to ± 1-8 ppb of Ox on the photochemical formation. Their effects can be explained by the different photochemical regimes.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00325316
Contributor : Benoit Gabrielle <>
Submitted on : Sunday, September 28, 2008 - 9:34:54 PM
Last modification on : Monday, December 14, 2020 - 9:53:00 AM
Long-term archiving on: : Friday, June 4, 2010 - 11:52:13 AM

Identifiers

  • HAL Id : tel-00325316, version 1

Citation

Marie-Noëlle Rolland. Modélisation biophysique des émissions de NO par les sols agricoles, spatialisation et impact sur la chimie troposphérique à l'échelle régionale. Océan, Atmosphère. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00325316⟩

Share

Metrics

Record views

1348

Files downloads

907