Dew Formation,Eddy-Correlation Latent Heat Fluxes,and the Surface Energy Imbalance at Cabauw During Stable Conditions |
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| Authors: | Stephan R de Roode Fred C Bosveld Petra S Kroon |
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| Institution: | 1.Clouds, Climate and Air Quality, Department of Multi-Scale Physics,Delft University of Technology,Delft,The Netherlands;2.Koninklijk Nederlands Meteorologisch Instituut,De Bilt,The Netherlands;3.Energy Research Centre of the Netherlands (ECN),Petten,The Netherlands |
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| Abstract: | Observations collected between 2000 and 2008 at the Cabauw meteorological measurement platform in the Netherlands were conditionally
sampled to select nights with stably stratified atmospheric conditions, clear skies and weak horizontal wind speeds (<3 m s−1). For these conditions the eddy-correlation latent heat fluxes are found to be negligibly small, while the conditionally
sampled surface energy balance exhibits a maximum residual. However, inspection of the specific humidities for these conditions
reveals systematic drying trends that are a maximum at the lowest measurement level above the surface. These drying trends
occur for any prevailing wind direction. Latent heat fluxes are calculated from the humidity budget equation and from a Penman-Monteith
dewfall model, with the results suggesting that during clear, stable nights the observed latent heat fluxes as obtained from
the eddy-correlation technique are erroneously small. |
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