caa a22 4500 475777840 CHVBK 20180406123636.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1002786702909 doi (NATIONALLICENCE)springer-10.1023/A:1002786702909 Correction Of Eddy-Covariance Measurements Incorporating Both Advective Effects And Density Fluxes [Elektronische Daten] [Kyaw Paw U, Dennis Baldocchi, Tilden Meyers, Kell Wilson] Equations are presented to correct eddy-covariancemeasurements for both fluctuations in density andnon-zero mean advection, induced by convergence ordivergence of flow, and spatial source/sinkinhomogeneity, under steady-state and transientconditions. This correction collapses to theWebb-Pearman-Leuning expression ifthe mean vertical velocity is zero, and formally addsthe Webb-Pearman-Leuning expression to the correctionssuggested by Lee for conditions ofnon-zero vertical velocity and source/sink and meanscalar horizontal homogeneity. The equation requiresmeasurement of the mean vertical gradients of thescalar concentration of interest (air temperature,humidity, CO2) as well as an accurateestimation of the mean vertical velocity, in additionto the vertical eddy covariance of the scalar. Simplemethods for the approximation of sensor tilt andcomplex terrain flow angle are presented, to allowestimation of non-zero mean vertical velocities. Theequations are applied to data from a maize crop and aforest to give examples of when the correction issignificant. In addition, a term for thethermodynamic expansion energy associated with watervapour flux is derived, which implies that the sonictemperature derived sensible heat flux will accuratelyinclude this contribution. Kluwer Academic Publishers, 2000 Advection nationallicence Carbon dioxide nationallicence Density correction nationallicence Eddy covariance nationallicence Paw U Kyaw Atmospheric Science, University of California, 95616, Davis, CA, U.S.A. aut Baldocchi Dennis Department of Environmental Science, Policy and Management, University of California, 94720, Berkeley, CA, U.S.A. aut Meyers Tilden Atmospheric Turbulence and Diffusion Division, Environmental Research Laboratory, National Oceanic and Atmospheric Administration, 37830, Oak Ridge, TN, U.S.A. aut Wilson Kell Atmospheric Turbulence and Diffusion Division, Environmental Research Laboratory, National Oceanic and Atmospheric Administration, 37830, Oak Ridge, TN, U.S.A. aut Boundary-Layer Meteorology Kluwer Academic Publishers 97/3(2000-12-01), 487-511 0006-8314 97:3<487 2000 97 10546 https://doi.org/10.1023/A:1002786702909 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002786702909 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Paw U Kyaw Atmospheric Science, University of California, 95616, Davis, CA, U.S.A aut NATIONALLICENCE 700 1- Baldocchi Dennis Department of Environmental Science, Policy and Management, University of California, 94720, Berkeley, CA, U.S.A aut NATIONALLICENCE 700 1- Meyers Tilden Atmospheric Turbulence and Diffusion Division, Environmental Research Laboratory, National Oceanic and Atmospheric Administration, 37830, Oak Ridge, TN, U.S.A aut NATIONALLICENCE 700 1- Wilson Kell Atmospheric Turbulence and Diffusion Division, Environmental Research Laboratory, National Oceanic and Atmospheric Administration, 37830, Oak Ridge, TN, U.S.A aut NATIONALLICENCE 773 0- Boundary-Layer Meteorology Kluwer Academic Publishers 97/3(2000-12-01), 487-511 0006-8314 97:3<487 2000 97 10546 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer