{"id":{"repo_id":"liege","oai_identifier":"oai:orbi.ulg.ac.be:2268/187886"},"canonical_url":"https://search.dev.ndltd.org/etd/liege/oai:orbi.ulg.ac.be:2268/187886","repository":{"repo_id":"liege","name":"Université de Liège","base_url":"https://orbi.uliege.be/oai/request"},"display":{"title":"Mise en place d’un système de mesure par covariance de turbulence des flux de N2O sur une parcelle agricole","abstract":"Nitrous oxide (N2O) is a greenhouse gas responsible for 8% of anthropogenic radiative forcing. It is also a major contributor to stratospheric ozone depletion. Agricultural soils represent its main source. N2O is produced by microorganisms through nitrification and denitrification processes. Both depend on oxygenation conditions and nitrogen and labile carbon availability, which are driven by soil and climate conditions and by farming practices. Yet there remain science gaps concerning the understanding of emission mechanisms and dynamics. The eddy covariance technique allows studying a whole ecosystem with a half-hourly temporal resolution, opening up for long-term monitoring and precise greenhouse gas budget calculation. However, this technique requires a specific expertise. In order to install such a system to measure N2O exchanges by a production crop at the Terrestrial Observatory of Lonzée (Belgium), we set the following goals : (1) establishing the state of knowledge concerning N2O fluxes exchanged by crops and identifying gaps, (2) setting up a N2O analyzer at the experimental site and providing operating procedures, and (3) building and adjusting the first data processing and calculation procedures. As a result of this work, scientific gaps were identified and avenues for further research are suggested. Monitoring and data acquisition routines as well as first data processing procedures were implemented. Numerous questions still remain regarding the adaptation of classical methods (created to study CO2) to N2O, and they constitute the investigation prospects of this work.","abstract_html":"Nitrous oxide (N2O) is a greenhouse gas responsible for 8% of anthropogenic radiative forcing. It is also a major contributor to stratospheric ozone depletion. Agricultural soils represent its main source. N2O is produced by microorganisms through nitrification and denitrification processes. Both depend on oxygenation conditions and nitrogen and labile carbon availability, which are driven by soil and climate conditions and by farming practices. Yet there remain science gaps concerning the understanding of emission mechanisms and dynamics. The eddy covariance technique allows studying a whole ecosystem with a half-hourly temporal resolution, opening up for long-term monitoring and precise greenhouse gas budget calculation. However, this technique requires a specific expertise. In order to install such a system to measure N2O exchanges by a production crop at the Terrestrial Observatory of Lonzée (Belgium), we set the following goals : (1) establishing the state of knowledge concerning N2O fluxes exchanged by crops and identifying gaps, (2) setting up a N2O analyzer at the experimental site and providing operating procedures, and (3) building and adjusting the first data processing and calculation procedures. As a result of this work, scientific gaps were identified and avenues for further research are suggested. Monitoring and data acquisition routines as well as first data processing procedures were implemented. Numerous questions still remain regarding the adaptation of classical methods (created to study CO2) to N2O, and they constitute the investigation prospects of this work.","abstract_has_math":false,"creators":["Lognoul, Margaux"],"institution":"ULiège - Université de Liège","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Aubinet, Marc"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-08-26","date_published":"2015-08-26","updated_at":"2026-07-24T02:49:29Z","subjects":["Nitrous oxide","Production crops","Eddy covariance","Quantum cascade laser analyzer","Protoxyde d'azote","Cultures de production","Covariance de turbulence","Analyseur laser à cascade quantique","Physical, chemical, mathematical & earth Sciences","Earth sciences & physical geography","Physique, chimie, mathématiques & sciences de la terre","Sciences de la terre & géographie physique"],"languages":["fr"],"rights":["open access","info:eu-repo/semantics/openAccess"],"rights_urls":["http://purl.org/coar/access_right/c_abf2"],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["info:hdl:2268/187886"],"render_values":[{"text":"info:hdl:2268/187886","href":null,"code":true}]}]},"links":{"outbound_url":"https://orbi.uliege.be/handle/2268/187886","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Aubinet, Marc"]},{"key":"dc:creator","label":"Author","values":["Lognoul, Margaux"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-08-26"]},{"key":"dc:publisher","label":"Institution","values":["ULiège - Université de Liège"]},{"key":"dc:type","label":"Dc Type","values":["master thesis","http://purl.org/coar/resource_type/c_bdcc","info:eu-repo/semantics/masterThesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Nitrous oxide","Production crops","Eddy covariance","Quantum cascade laser analyzer","Protoxyde d'azote","Cultures de production","Covariance de turbulence","Analyseur laser à cascade quantique","Physical, chemical, mathematical & earth Sciences","Earth sciences & physical geography","Physique, chimie, mathématiques & sciences de la terre","Sciences de la terre & géographie physique"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["fr"]},{"key":"dc:rights","label":"Dc Rights","values":["open access","http://purl.org/coar/access_right/c_abf2","info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://orbi.uliege.be/handle/2268/187886","info:hdl:2268/187886","https://orbi.uliege.be/bitstream/2268/187886/1/TFE_2015_LognoulM.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Nitrous oxide (N2O) is a greenhouse gas responsible for 8% of anthropogenic radiative forcing. It is also a major contributor to stratospheric ozone depletion. Agricultural soils represent its main source. N2O is produced by microorganisms through nitrification and denitrification processes. Both depend on oxygenation conditions and nitrogen and labile carbon availability, which are driven by soil and climate conditions and by farming practices. Yet there remain science gaps concerning the understanding of emission mechanisms and dynamics. The eddy covariance technique allows studying a whole ecosystem with a half-hourly temporal resolution, opening up for long-term monitoring and precise greenhouse gas budget calculation. However, this technique requires a specific expertise. In order to install such a system to measure N2O exchanges by a production crop at the Terrestrial Observatory of Lonzée (Belgium), we set the following goals : (1) establishing the state of knowledge concerning N2O fluxes exchanged by crops and identifying gaps, (2) setting up a N2O analyzer at the experimental site and providing operating procedures, and (3) building and adjusting the first data processing and calculation procedures. As a result of this work, scientific gaps were identified and avenues for further research are suggested. Monitoring and data acquisition routines as well as first data processing procedures were implemented. Numerous questions still remain regarding the adaptation of classical methods (created to study CO2) to N2O, and they constitute the investigation prospects of this work.","Le protoxyde d’azote (N2O) est un gaz à effet de serre qui participe à 8% du forçage radiatif d’origine anthropique. C’est aussi un facteur majeur de la déplétion de la couche d’ozone. Les sols agricoles en sont la source principale. Le N2O y est produit par des micro-organismes lors des processus de nitrification et de dénitrification, qui dépendent des conditions d’oxygénation, de la disponibilité en azote et en carbone labile. Ces dernières sont régies par les conditions pédoclimatiques et par les pratiques culturales. Cependant, il subsiste des lacunes dans la compréhension des mécanismes et des dynamiques d’émission. La covariance de turbulence est une technique de mesure permettant d’étudier un écosystème avec une résolution temporelle semi-horaire, et rend possible le suivi à long terme et l’établissement de bilans précis de gaz à effet de serre. Toutefois, cette technique demande une expertise spécifique. Dans le but d’installer un tel système pour mesurer les échanges de N2O par une culture à l’Observatoire Terrestre de Lonzée (Belgique), nous avons défini les objectifs suivants : (1) établissement de l’état des connaissances en matière de flux de N2O échangés par les cultures et identifications des lacunes, (2) installation sur site d’un analyseur de N2O et mise en place de procédures de fonctionnement, et (3) mise en place des premières procédures de traitement et de calcul de données. Au terme de ce travail, les lacunes de connaissance ont été identifiées et des pistes de recherches sont proposées. Des procédures de suivi et d’acquisition ainsi que les premiers traitements des données ont pu être mises en place. De nombreuses questions subsistent cependant quant à l’adaptation au N2O de méthodes classiques créées pour l’étude du CO2, et constituent les perspectives d’investigation de ce travail.","NO(EC)²"]},{"key":"dc:format","label":"Dc Format","values":["69 + 1"]},{"key":"dc:title","label":"Title","values":["Mise en place d’un système de mesure par covariance de turbulence des flux de N2O sur une parcelle agricole","Setting up an eddy covariance system to measure N2O flux exchanged by a crop"]}]}],"canonical_facts":{"dc:contributor":["Aubinet, Marc"],"dc:creator":["Lognoul, Margaux"],"dc:date":["2015-08-26"],"dc:description":["Nitrous oxide (N2O) is a greenhouse gas responsible for 8% of anthropogenic radiative forcing. It is also a major contributor to stratospheric ozone depletion. Agricultural soils represent its main source. N2O is produced by microorganisms through nitrification and denitrification processes. Both depend on oxygenation conditions and nitrogen and labile carbon availability, which are driven by soil and climate conditions and by farming practices. Yet there remain science gaps concerning the understanding of emission mechanisms and dynamics. The eddy covariance technique allows studying a whole ecosystem with a half-hourly temporal resolution, opening up for long-term monitoring and precise greenhouse gas budget calculation. However, this technique requires a specific expertise. In order to install such a system to measure N2O exchanges by a production crop at the Terrestrial Observatory of Lonzée (Belgium), we set the following goals : (1) establishing the state of knowledge concerning N2O fluxes exchanged by crops and identifying gaps, (2) setting up a N2O analyzer at the experimental site and providing operating procedures, and (3) building and adjusting the first data processing and calculation procedures. As a result of this work, scientific gaps were identified and avenues for further research are suggested. Monitoring and data acquisition routines as well as first data processing procedures were implemented. Numerous questions still remain regarding the adaptation of classical methods (created to study CO2) to N2O, and they constitute the investigation prospects of this work.","Le protoxyde d’azote (N2O) est un gaz à effet de serre qui participe à 8% du forçage radiatif d’origine anthropique. C’est aussi un facteur majeur de la déplétion de la couche d’ozone. Les sols agricoles en sont la source principale. Le N2O y est produit par des micro-organismes lors des processus de nitrification et de dénitrification, qui dépendent des conditions d’oxygénation, de la disponibilité en azote et en carbone labile. Ces dernières sont régies par les conditions pédoclimatiques et par les pratiques culturales. Cependant, il subsiste des lacunes dans la compréhension des mécanismes et des dynamiques d’émission. La covariance de turbulence est une technique de mesure permettant d’étudier un écosystème avec une résolution temporelle semi-horaire, et rend possible le suivi à long terme et l’établissement de bilans précis de gaz à effet de serre. Toutefois, cette technique demande une expertise spécifique. Dans le but d’installer un tel système pour mesurer les échanges de N2O par une culture à l’Observatoire Terrestre de Lonzée (Belgique), nous avons défini les objectifs suivants : (1) établissement de l’état des connaissances en matière de flux de N2O échangés par les cultures et identifications des lacunes, (2) installation sur site d’un analyseur de N2O et mise en place de procédures de fonctionnement, et (3) mise en place des premières procédures de traitement et de calcul de données. Au terme de ce travail, les lacunes de connaissance ont été identifiées et des pistes de recherches sont proposées. Des procédures de suivi et d’acquisition ainsi que les premiers traitements des données ont pu être mises en place. De nombreuses questions subsistent cependant quant à l’adaptation au N2O de méthodes classiques créées pour l’étude du CO2, et constituent les perspectives d’investigation de ce travail.","NO(EC)²"],"dc:format":["69 + 1"],"dc:identifier":["https://orbi.uliege.be/handle/2268/187886","info:hdl:2268/187886","https://orbi.uliege.be/bitstream/2268/187886/1/TFE_2015_LognoulM.pdf"],"dc:language":["fr"],"dc:publisher":["ULiège - Université de Liège"],"dc:rights":["open access","http://purl.org/coar/access_right/c_abf2","info:eu-repo/semantics/openAccess"],"dc:subject":["Nitrous oxide","Production crops","Eddy covariance","Quantum cascade laser analyzer","Protoxyde d'azote","Cultures de production","Covariance de turbulence","Analyseur laser à cascade quantique","Physical, chemical, mathematical & earth Sciences","Earth sciences & physical geography","Physique, chimie, mathématiques & sciences de la terre","Sciences de la terre & géographie physique"],"dc:title":["Mise en place d’un système de mesure par covariance de turbulence des flux de N2O sur une parcelle agricole","Setting up an eddy covariance system to measure N2O flux exchanged by a crop"],"dc:type":["master thesis","http://purl.org/coar/resource_type/c_bdcc","info:eu-repo/semantics/masterThesis"]},"updated_at":"2026-07-24T02:49:29Z"}