A comparison of MM5 and meteo mast wind profiles at Cabauw, The Netherlands and Wilhelmshaven, Germany

Durante, Francesco and de Paus, Tim (2006) A comparison of MM5 and meteo mast wind profiles at Cabauw, The Netherlands and Wilhelmshaven, Germany. e-WindEng (003). ISSN 1901-9181

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Abstract

The model MM5, developed at Pennsylvania State University / NCAR, was used to study wind regimes at Cabauw, The Netherlands and Wilhelmshaven, Germany. The main goal was to model wind profiles in the lower Boundary Layer, and to compare results with measured profiles. For Cabauw, The Netherlands, a study for the period of 2nd - 22nd April 1993 has been conducted with 4 two-way nests up to 1x1km horizontal resolution and 25 vertical levels, of which four below 200 meter. Initialisation was made with 2.5 degrees NCAR/NCEP - reanalysis data. Wind profiles were calculated using Blackadar, ETA and MRF PBL numerical schemes of MM5. Additionally for these PBL-schemes time series of wind speed have also been investigated. The time series of measured wind speed were very similar to the MM5 output. The 21 day-averaged vertical wind profiles at the three different PBL-schemes were also similar to the wind profiles calculated from measurements. A second set of simulations of wind regime have been conducted over Wilhelmshaven, Germany for the period 22nd-28th December 2003. Simulated profiles have been compared to wind measurements recorded by a 130 m meteorological mast. The MM5 two way nesting capabilities have been used in order to get a horizontal resolution of 1 km at the final domain, 31 sigma levels are used in the vertical direction. NCEP-FNL analysis provide the simulation with the necessary initial and boundary conditions. The PBL schemes under study have been MRF, Blackader, ETA Mellor-Yamada-Janjic, Burk-Thompson, and Gayno-Seaman PBL schemes. Results show noticeable influence of PBL parameterization on simulated wind profile. The run conducted according to ETA PBL scheme seems to produce a mean wind profile with the best agreement with measured data. A simple sensitivity study reveals that horizontal resolution plays, on these terrain conditions, a minor role with respect to parameterization for the simulation of wind on the lower PBL.

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• A comparison of MM5 and meteo mast wind profiles at Cabauw, The Netherlands and Wilhelmshaven, Germany (deposited 26 April 2007) [Currently Displayed]

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