Determination of Area-Averaged Water Vapour Fluxes with Large Aperture and Radio Wave Scintillometers over a Heterogeneous Surface – Flevoland Field Experiment

A large aperture scintillometer (LAS) andradio wave scintillometer (RWS)were installed over a heterogeneous areato test the applicability of the scintillation method.The heterogeneity in the area, whichconsisted of many plots, was mainly caused bydifferences in thermal properties ofthe crops; the va...

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Bibliographic Details
Published in:Boundary-layer meteorology 2002-10, Vol.105 (1), p.63-83
Main Authors: Meijninger, W. M. L., Green, A. E., Hartogensis, O. K., Kohsiek, W., Hoedjes, J. C. B., Zuurbier, R. M., De Bruin, H. A. R.
Format: Article
Language:English
Subjects:
Boundary layer
Crop science
Heterogeneity
Meteorologie en Luchtkwaliteit
Meteorology and Air Quality
Radio waves
Scientific apparatus & instruments
Thermal properties
Thermodynamics
Water vapor
WIMEK
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Summary:A large aperture scintillometer (LAS) andradio wave scintillometer (RWS)were installed over a heterogeneous areato test the applicability of the scintillation method.The heterogeneity in the area, whichconsisted of many plots, was mainly caused bydifferences in thermal properties ofthe crops; the variations in theaerodynamic roughness lengthwere small. The water vapour fluxesderived from the combined LAS-RWSsystem, also known as the two-wavelengthmethod, agreed fairly well with the aggregatedwater vapour fluxes derived from in-situeddy covariance measurements. The water vapourfluxes derived from a stand-alone LASare also presented. It was found that a single LASand an estimate of the area averagedavailable energy (using a simple parameterisationscheme) can provide also reasonablearea-averaged water vapour fluxes.[PUBLICATION ABSTRACT]
ISSN:0006-8314
1573-1472
DOI:10.1023/A:1019683616097