Exploring the use of displaced beam scintillometer for daytime measurement of surface energy fluxes over a Mediterranean Olive Orchard

Antonio Motisi, Teodoro Georgiadis, Henk A.R. De Bruin, Joseph G. Alfieri, Antonino Drago, Maurizio Sciortino

Risultato della ricerca: Article

1 Citazione (Scopus)

Abstract

Studies have shown that the footprint of a single eddy covariance (EC) system may not yield representative measurements of the turbulent fluxes at the field scale for sparse vegetated surfaces, whereas scintillometry, due to its larger footprint, may be more suitable for this purpose. However, the latter approach strongly relies on the Monin-Obukov similarity theory (MOST) that strictly applies in the inertial sub-layer only. This work aims at experimentally confirm the reliability of displaced-beam laser scintillometers (DBLS) measurements over an olive orchard against two EC systems during summer and autumn months of 2007 through 2009. It was found that the DBLS underestimated both the momentum and sensible heat fluxes by 15 to 20% when established retrieval procedures were applied. A new method to determine the sensible heat flux from the DBLS based on the addition of a single-height wind speed measurement was tested, yielding estimates that compare well with the EC observations, with discrepancies in sensible heat fluxes of about 30 to 40 W m-2.
Lingua originaleEnglish
pagine (da-a)13-28
Numero di pagine16
RivistaITALIAN JOURNAL OF AGROMETEOROLOGY
VolumeXVIII
Stato di pubblicazionePublished - 2014

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eddy covariance
sensible heat flux
surface energy
energy flux
orchard
laser
footprint
momentum
wind velocity
autumn
summer

All Science Journal Classification (ASJC) codes

  • Forestry
  • Atmospheric Science
  • Agronomy and Crop Science

Cita questo

Exploring the use of displaced beam scintillometer for daytime measurement of surface energy fluxes over a Mediterranean Olive Orchard. / Motisi, Antonio; Georgiadis, Teodoro; De Bruin, Henk A.R.; Alfieri, Joseph G.; Drago, Antonino; Sciortino, Maurizio.

In: ITALIAN JOURNAL OF AGROMETEOROLOGY, Vol. XVIII, 2014, pag. 13-28.

Risultato della ricerca: Article

Motisi, Antonio ; Georgiadis, Teodoro ; De Bruin, Henk A.R. ; Alfieri, Joseph G. ; Drago, Antonino ; Sciortino, Maurizio. / Exploring the use of displaced beam scintillometer for daytime measurement of surface energy fluxes over a Mediterranean Olive Orchard. In: ITALIAN JOURNAL OF AGROMETEOROLOGY. 2014 ; Vol. XVIII. pagg. 13-28.
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AU - Motisi, Antonio

AU - Georgiadis, Teodoro

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AU - Alfieri, Joseph G.

AU - Drago, Antonino

AU - Sciortino, Maurizio

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AB - Studies have shown that the footprint of a single eddy covariance (EC) system may not yield representative measurements of the turbulent fluxes at the field scale for sparse vegetated surfaces, whereas scintillometry, due to its larger footprint, may be more suitable for this purpose. However, the latter approach strongly relies on the Monin-Obukov similarity theory (MOST) that strictly applies in the inertial sub-layer only. This work aims at experimentally confirm the reliability of displaced-beam laser scintillometers (DBLS) measurements over an olive orchard against two EC systems during summer and autumn months of 2007 through 2009. It was found that the DBLS underestimated both the momentum and sensible heat fluxes by 15 to 20% when established retrieval procedures were applied. A new method to determine the sensible heat flux from the DBLS based on the addition of a single-height wind speed measurement was tested, yielding estimates that compare well with the EC observations, with discrepancies in sensible heat fluxes of about 30 to 40 W m-2.

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