Towards Closing the Surface Energy Budget of a Mid-latitude Grassland

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 he...

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Bibliographic Details
Published in:Boundary-layer meteorology 2008, Vol.126 (1), p.125-136
Main Authors: Jacobs, Adrie F. G, Heusinkveld, Bert G, Holtslag, Albert A. M
Format: Article
Language:English
Subjects:
aardoppervlak
Air masses
Animal and plant ecology
Animal, plant and microbial ecology
area
Atmospheric boundary layer
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
balance closure
Biological and medical sciences
boundary-layer
carbon
cases-99
Convection, turbulence, diffusion. Boundary layer structure and dynamics
Dew
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
eddy-correlation
energiebalans
energy balance
Exact sciences and technology
External geophysics
Fluctuations
forest
fotosynthese
Fundamental and applied biological sciences. Psychology
graslanden
Grasslands
Harmonic analysis
heat flow
heat-flux
land
land surface
Meteorologie (algemeen)
Meteorology
Meteorology (General)
Orignal Paper
Photosynthesis
Soil heat flux
Soil surfaces
storage terms
Surface energy budget
Surface energy budget closure
Synecology
Terrestrial ecosystems
warmtestroming
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Summary: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.
ISSN:0006-8314
1573-1472
DOI:10.1007/s10546-007-9209-2