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    <dct:description>The eddy correlation (ECOR) flux measurement system provides in situ, half-hour measurements of the surface turbulent fluxes of momentum, sensible heat, latent heat, and carbon dioxide. The fluxes are obtained with the eddy covariance technique, which invo lves correlation of the vertical wind component with the horizontal wind component, the air temperature, the water vapor density, and the CO2 concentration. Instruments used are a fast-response, three-dimensional (3-D) wind sensor (sonic anemometer) to obt ain the orthogonal wind components and the speed of sound (SOS) (used to derive the air temperature) and an open-path infrared gas analyzer (IRGA) to obtain the water vapor density and the CO2 concentration. The ECOR systems are deployed at the locations w here other methods for surface flux measurements (e.g., energy balance Bowen ratio systems) are difficult to employ, primarily at the north edge of a field of crops.</dct:description>
        <dcat:keyword>surface/subsurface properties</dcat:keyword>
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        <dcat:keyword>surface/subsurface properties</dcat:keyword>
        <dcat:keyword>atmospheric state</dcat:keyword>
        <dcat:keyword>atmospheric carbon</dcat:keyword>
        <dcat:keyword>surface properties</dcat:keyword>
        <dcat:keyword>other trace gases</dcat:keyword>
        <dcat:keyword>surface meteorology</dcat:keyword>
        <dcat:keyword>upper air state</dcat:keyword>
        <dcat:keyword>surface flux</dcat:keyword>
        <dcat:keyword>surface/subsurface state</dcat:keyword>
        <dcat:keyword>atmospheric turbulence</dcat:keyword>
        <dcat:keyword>co2 flux</dcat:keyword>
        <dcat:keyword>friction velocity</dcat:keyword>
        <dcat:keyword>latent heat flux</dcat:keyword>
        <dcat:keyword>sensible heat flux</dcat:keyword>
        <dcat:keyword>surface stress</dcat:keyword>
        <dcat:keyword>30ecor : ecor: surface vertical fluxes of momentum</dcat:keyword>
        <dcat:keyword>sensible heat</dcat:keyword>
        <dcat:keyword>and latent heat</dcat:keyword>
        <dcat:keyword>30-min avg</dcat:keyword>
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    <dct:title>Eddy Correlation Flux Measurement System</dct:title>
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