8.4
A comparison of ECMWF re-analysis data with observations from Cabauw
Fred Bosveld, KNMI, De Bilt, Netherlands; and H. Klein Baltink and A. Beljaars
The ECMWF Re-analysis project (ERA40) provides a state of the art and consistent time series of the state of the atmosphere over the past 40 year. This is achieved by using a recent version of the ECMWF analysis-forecasting system over this period. A set of 11 year of data (1986-1996) from the Cabauw Experimental Site for Atmospheric Research (CESAR) has been prepared including profiles of wind, temperature and humidity up to 200 m and surface fluxes of radiation, momentum and sensible-, latent- and soil heat flux. Since July 1994 a windprofiler/RASS system is operational in Cabauw giving, on the average, wind profiles up to 3.5 km agl. and virtual temperature profiles up to 750 m agl. The latest ECMWF model version has an increased vertical resolution so the structure of the atmospheric boundary layer is resolved in much more detail then with the previous re-analysis ERA15. Since Cabauw data has not been used in the assimilation proces of ERA40 they can be used for an independent evaluation. A comparison will be presented of ERA40 atmospheric boundary layer profiles and surface fluxes for the model grid point Cabauw with the long term profile and surface flux observations from Cabauw.
Session 8, Fundamental Studies of the ABL
Tuesday, 16 July 2002, 3:30 PM-5:30 PM
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