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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| Authors: | W M L Meijninger A E Green O K Hartogensis W Kohsiek J C B Hoedjes R M Zuurbier H A R De Bruin |
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| Institution: | (1) Meteorology and Air Quality Group, Wageningen University and Research Centre, Duivendaal 2, 6701 AP Wageningen, The Netherlands;(2) Kerikeri Research Centre, Horticultural Research Institute of New Zealand, P.O. Box 788, Bay of Islands, Kerikeri, 0470, New Zealand;(3) Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE De Bilt, The Netherlands |
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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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| Keywords: | Blending height Evaporation Footprint Heterogeneity Scintillation Surface fluxes |
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