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

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Abstract

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.

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Authors and Affiliations

  1. Meteorology and Air Quality Group, Wageningen University and Research Centre, Duivendaal 2, 6701 AP, Wageningen, The Netherlands

    W. M. L. Meijninger, O. K. Hartogensis, J. C. B. Hoedjes, R. M. Zuurbier & H. A. R. De Bruin

  2. Kerikeri Research Centre, Horticultural Research Institute of New Zealand, P.O. Box 788, Bay of Islands, Kerikeri, 0470, New Zealand

    A. E. Green

  3. Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE, De Bilt, The Netherlands

    W. Kohsiek

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  1. W. M. L. Meijninger
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  7. H. A. R. De Bruin
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Meijninger, W.M.L., Green, A.E., Hartogensis, O.K. et al. Determination of Area-Averaged Water Vapour Fluxes with Large Aperture and Radio Wave Scintillometers over a Heterogeneous Surface – Flevoland Field Experiment. Boundary-Layer Meteorology 105, 63–83 (2002). https://doi.org/10.1023/A:1019683616097

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