Towards Closing the Surface Energy Budget of a Mid-latitude Grassland |
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| Authors: | Adrie F G Jacobs Bert G Heusinkveld Albert A M Holtslag |
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| Institution: | (1) Meteorology and Air Quality Group, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands |
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| Abstract: | Observations for May and August, 2005, from a long-term grassland meteorological station situated in central Netherlands were
used to evaluate the closure of the surface energy budget. We compute all possible enthalpy changes, such as the grass cover
heat storage, dew water heat storage, air mass heat storage and the photosynthesis energy flux, over an averaging time interval.
In addition, the soil heat flux was estimated using a harmonic analysis technique to obtain a more accurate assessment of
the surface soil heat flux. By doing so, a closure of 96% was obtained. The harmonic analysis technique appears to improve
closure by 9%, the photosynthesis for 3% and the rest of the storage terms for a 3% improvement of the energy budget closure.
For calm nights (friction velocity u
* < 0.1 m s−1) when the eddy covariance technique is unreliable for measurement of the vertical turbulent fluxes, the inclusion of a scheme
that calculates dew fluxes improves the energy budget closure significantly. |
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| Keywords: | Grassland Photosynthesis Soil heat flux Surface energy budget Surface energy budget closure |
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