Eddy fluxes of CO2, water vapor,and sensible heat over a deciduous forest |
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| Authors: | Shashi B Verma Dennis D Baldocchi Dean E Anderson Detlef R Matt Robert J Clement |
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| Institution: | (1) Center for Agricultural Meteorology and Climatology, University of Nebraska, 68583-0728 Lincoln, USA;(2) Atmospheric Turbulence and Diffusion Division/NOAA/ARL, P.O. Box E, 37831 Oak Ridge, TN, USA |
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| Abstract: | Fluxes of CO2, latent heat and sensible heat were measured above a fully-leafed deciduous forest in eastern Tennessee with the eddy correlation technique. These are among the first reported observations over such a surface. The influences of solar radiation, vapor pressure deficit and the aerodynamic and canopy resistances on these mass and energy exchanges are examined. Following a concept introduced by McNaughton and Jarvis (1983), examination of our data suggest that the water vapor exchange of a deciduous forest is not as strongly coupled with net radiation as is that of agricultural crops. The degree of decoupling is smaller than in the case of a coniferous forest. This difference may be attributable in part to the greater aerodynamic resistance to water vapor transfer in a deciduous forest. It appears that the concept of decoupling may be extended to the CO2 exchange of a deciduous forest as well.Published as Paper No. 7832, Journal Series, Nebraska Agricultural Research Division. ATDD Contribution No. 85-17. |
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