Koninklijk Nederlands Meteorologisch Instituut; Ministerie van Verkeer en Waterstaat

KNMI Cabauw Observations
InSitu Observations

The Cabauw in-situ observational program delivers land surface and atmospheric boundary layer parameters.

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The observations are used among others for evaluating land surface and boundary layer schemes in atmospheric models, validation of satellite retrieval schemes, studies for wind energy, studies of fog formation and climatology. Part of the program has an operational status, these measurements are used also by the weather service. Observed are the profiles of wind speed and wind direction, temperature and humidity along the 200 m Cabauw meteorological mast, the surface flux of precipitation, the surface radiation budget in its four components short wave up- and downward radiation and long wave up- and downward radiation, surface visibilty the components of the surface energy budget, sensible heat flux, latent heat flux and soil heat flux, the momentum flux and auxillary parameters to judge the state of the landsurface like soil water content and radiative vegetation temperature.

This measuring program couples with other observational activities within CESAR. Most noticable are: The soil hydrological program of WUR; the green house gas concentration observations of ECN; Wind profiler/RASS observations of KNMI and the Raman Lidar observations of KNMI (humidity profiles). Tower flux observations are performed in cooperation with WUR-Alterra.

Other important additions to the program are: Atmospheric profiles from the radiosonde De Bilt, currently launched two times a day; for the study of representativity of Cabauw observations of the surrouding weather stations Schiphol (240), De Bilt (260), Zestienhoven (344) and Gilze Rijen (350) and for the geostrophic wind at Cabauw pressure readings from eight weather station in a radius of 75 km around Cabauw.

In the period 1986-1996 a continuous in-situ measurement program has been performed at Cabauw. After a reconstruction period the current program started in may 2000. The number of observed parameters have increased over the years.

Last updated on 17 September 2015