Towards closing the surface energy budget of a mid-latitude grassland

Research output: Contribution to journalArticleAcademicpeer-review

63 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)125-136
JournalBoundary-Layer Meteorology
Volume126
Issue number1
DOIs
Publication statusPublished - 2008

Fingerprint

surface energy
energy budget
grassland
dew
harmonic analysis
heat flux
photosynthesis
eddy covariance
energy flux
enthalpy
air mass
soil surface
friction
grass
heat storage
soil
water

Keywords

  • energy balance
  • grasslands
  • photosynthesis
  • land surface
  • heat flow
  • balance closure
  • heat-flux
  • eddy-correlation
  • boundary-layer
  • storage terms
  • forest
  • land
  • cases-99
  • carbon
  • area

Cite this

@article{27d968991f8941a694ce5be1a3f5c759,
title = "Towards closing the surface energy budget of a mid-latitude grassland",
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.",
keywords = "energiebalans, graslanden, fotosynthese, aardoppervlak, warmtestroming, energy balance, grasslands, photosynthesis, land surface, heat flow, balance closure, heat-flux, eddy-correlation, boundary-layer, storage terms, forest, land, cases-99, carbon, area",
author = "A.F.G. Jacobs and B.G. Heusinkveld and A.A.M. Holtslag",
year = "2008",
doi = "10.1007/s10546-007-9209-2",
language = "English",
volume = "126",
pages = "125--136",
journal = "Boundary-Layer Meteorology",
issn = "0006-8314",
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}

Towards closing the surface energy budget of a mid-latitude grassland. / Jacobs, A.F.G.; Heusinkveld, B.G.; Holtslag, A.A.M.

In: Boundary-Layer Meteorology, Vol. 126, No. 1, 2008, p. 125-136.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Towards closing the surface energy budget of a mid-latitude grassland

AU - Jacobs, A.F.G.

AU - Heusinkveld, B.G.

AU - Holtslag, A.A.M.

PY - 2008

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N2 - 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.

AB - 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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KW - fotosynthese

KW - aardoppervlak

KW - warmtestroming

KW - energy balance

KW - grasslands

KW - photosynthesis

KW - land surface

KW - heat flow

KW - balance closure

KW - heat-flux

KW - eddy-correlation

KW - boundary-layer

KW - storage terms

KW - forest

KW - land

KW - cases-99

KW - carbon

KW - area

U2 - 10.1007/s10546-007-9209-2

DO - 10.1007/s10546-007-9209-2

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