The Energy Balance Experiment EBEX-2000. Part I: Overview and energy balance

S.P. Oncley, T. Foken, R. Vogt, W. Kohsiek, H.A.R. Debruin, C. Bernhofer, A. Christen, E. van Gorsel, D. Grantz, C. Feigenwinter, I. Lehner, C. Liebethal, H. Liu, M. Mauder, A. Pitacco, L. Ribeiro, T. Weidinger

Research output: Contribution to journalArticleAcademicpeer-review

255 Citations (Scopus)

Abstract

An overview of the Energy Balance Experiment (EBEX-2000) is given. This experiment studied the ability of state-of-the-art measurements to close the surface energy balance over a surface (a vegetative canopy with large evapotranspiration) where closure has been difficult to obtain. A flood-irrigated cotton field over uniform terrain was used, though aerial imagery and direct flux measurements showed that the surface still was inhomogeneous. All major terms of the surface energy balance were measured at nine sites to characterize the spatial variability across the field. Included in these observations was an estimate of heat storage in the plant canopy. The resultant imbalance still was 10%, which exceeds the estimated measurement error. We speculate that horizontal advection in the layer between the canopy top and our flux measurement height may cause this imbalance, though our estimates of this term using our measurements resulted in values less than what would be required to balance the budget.
Original languageEnglish
Pages (from-to)1-28
JournalBoundary-Layer Meteorology
Volume123
Issue number1
DOIs
Publication statusPublished - 2007

Keywords

  • atmospheric surface-layer
  • frequency-response corrections
  • relaxed eddy accumulation
  • water-vapor transfer
  • flux measurements
  • sonic anemometer
  • heat-flux
  • sensible heat
  • land-surface
  • exchange

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