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The eddy covariance (also known as eddy correlation and eddy flux) is a key atmospheric measurement technique to measure and calculate vertical turbulent fluxes within atmospheric boundary layers. The method analyses high-frequency wind and scalar atmospheric data series, gas, energy, and momentum, which yields values of fluxes of these properties. It is a statistical method used in meteorology and other applications (micrometeorology, oceanography, hydrology, agricultural sciences, industrial and regulatory applications, etc.) to determine exchange rates of trace gases over natural ecosystems and agricultural fields, and to quantify gas emissions rates from other land and water areas. It is frequently used to estimate momentum, heat, water vapour, carbon dioxide and methane fluxes.

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  • Eddy covariance (en)
  • Covariance des turbulences (fr)
  • Covariância de vórtices turbulentos (pt)
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  • The eddy covariance (also known as eddy correlation and eddy flux) is a key atmospheric measurement technique to measure and calculate vertical turbulent fluxes within atmospheric boundary layers. The method analyses high-frequency wind and scalar atmospheric data series, gas, energy, and momentum, which yields values of fluxes of these properties. It is a statistical method used in meteorology and other applications (micrometeorology, oceanography, hydrology, agricultural sciences, industrial and regulatory applications, etc.) to determine exchange rates of trace gases over natural ecosystems and agricultural fields, and to quantify gas emissions rates from other land and water areas. It is frequently used to estimate momentum, heat, water vapour, carbon dioxide and methane fluxes. (en)
  • La covariance des turbulences, corrélation des turbulences ou flux des turbulences sert à mesurer et à calculer les flux turbulents verticaux à l'intérieur des couches limites de l'atmosphère. La méthode analyse des jeux de données à hautes fréquences de vent et de valeurs scalaires, et produit les flux de ses propriétés. C'est une méthode statistique utilisée en météorologie et autres domaines (micrométéorologie, océanographie, hydrologie, sciences de l'agriculture, applications industrielles et régulatrices, etc.) afin de déterminer les taux d'échange de gaz rares entre écosystèmes naturels et exploitations agricoles, ainsi que les taux d'émission d'autres étendues de terrains ou d'eau. Les flux fréquemment estimés sont la quantité de mouvement, la densité de flux thermique, la vapeur d' (fr)
  • O método de Covariância de Vórtices Turbulentos ou “Eddy Covariance” (EC) propicia uma medida direta da troca líquida, ou seja, da quantidade absorvida ou emitida de gás carbônico (CO2), vapor d’água e calor entre uma superfície vegetada e a atmosfera. Baseia-se no princípio que o fluxo vertical de uma grandeza (escalar ou vetorial) na camada superficial é proporcional à covariância da velocidade vertical do vento e da concentração da grandeza. A Figura 2 mostra um ecossistema florestal e alguns instrumentos que possibilitaram a utilização da técnica de EC. (pt)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/EddyCovariance_diagram_2.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/EddyCovariance_equations_part_1.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/EddyCovariance_equations_part_2.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Eddy_Covariance_IRGA_Sonic.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Eddycorrelationsystem.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Pyörrekovarianssi-tekniikan_kaaviokuva.jpg
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  • The eddy covariance (also known as eddy correlation and eddy flux) is a key atmospheric measurement technique to measure and calculate vertical turbulent fluxes within atmospheric boundary layers. The method analyses high-frequency wind and scalar atmospheric data series, gas, energy, and momentum, which yields values of fluxes of these properties. It is a statistical method used in meteorology and other applications (micrometeorology, oceanography, hydrology, agricultural sciences, industrial and regulatory applications, etc.) to determine exchange rates of trace gases over natural ecosystems and agricultural fields, and to quantify gas emissions rates from other land and water areas. It is frequently used to estimate momentum, heat, water vapour, carbon dioxide and methane fluxes. The technique is also used extensively for verification and tuning of global climate models, mesoscale and weather models, complex biogeochemical and ecological models, and remote sensing estimates from satellites and aircraft. The technique is mathematically complex, and requires significant care in setting up and processing data. To date, there is no uniform terminology or a single methodology for the eddy covariance technique, but much effort is being made by flux measurement networks (e.g., FluxNet, Ameriflux, ICOS, CarboEurope, Fluxnet Canada, OzFlux, NEON, and iLEAPS) to unify the various approaches. The technique has additionally proven applicable under water to the benthic zone for measuring oxygen fluxes between the sea floor and overlying water. In these environments, the technique is generally known as the eddy correlation technique, or just eddy correlation. Oxygen fluxes are extracted from raw measurements largely following the same principles as used in the atmosphere, and they are typically used as a proxy for carbon exchange, which is important for local and global carbon budgets. For most benthic ecosystems, eddy correlation is the most accurate technique for measuring in-situ fluxes. The technique's development and its applications under water remains a fruitful area of research. (en)
  • La covariance des turbulences, corrélation des turbulences ou flux des turbulences sert à mesurer et à calculer les flux turbulents verticaux à l'intérieur des couches limites de l'atmosphère. La méthode analyse des jeux de données à hautes fréquences de vent et de valeurs scalaires, et produit les flux de ses propriétés. C'est une méthode statistique utilisée en météorologie et autres domaines (micrométéorologie, océanographie, hydrologie, sciences de l'agriculture, applications industrielles et régulatrices, etc.) afin de déterminer les taux d'échange de gaz rares entre écosystèmes naturels et exploitations agricoles, ainsi que les taux d'émission d'autres étendues de terrains ou d'eau. Les flux fréquemment estimés sont la quantité de mouvement, la densité de flux thermique, la vapeur d'eau, le dioxyde de carbone et le méthane. La technique est aussi utilisée pour la vérification et l'ajustement de , de modèles météorologiques à échelle moyenne, des modèles biogéochimiques et écologiques et d'estimation de la télédétection à partir de satellites ou d'avions. Les réseaux de mesure, par exemple (en), Ameriflux, ICOS, CarboEurope, Fluxnet Canada, OzFlux, NEON et iLEAPS, ont en projet l'unification de la terminologie et de la méthodologie. (fr)
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