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Effect of Subgrid - scale Terrain Parameterization on WRF’s Performance on Wind Field over Complex Terrain


Journal

Journal of Arid Meteorology

Authors

Chenchen, YU Ye, HE Jianjun

Year

2016

Volume

34

Issue

1

Pages

96-105

Corresponding Author

Yu, Y

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yyu@lzb.ac.cn

Keywords

WRF loess plateau subgrid-scale terrain wind field

Abstract

Wind fields over the Loess Plateau are very complex due to the complex underlying surface.This paper investigated the effect of subgrid-scale terrain parameterization on near surface wind fields simulated by the WRF over the Loess Plateau.Results indicated that the subgrid-scale terrain standard deviation (σs o )was larger over complex terrain,and the elevation differences between obser-vation sites and the nearest model grids increased withσs o.In summer of 2012,wind speed in the designated region was small.When the influence of subgrid-scale terrain was ignored,the WRF over-estimated wind speed when the observation value was higher,but under-estimated wind speed when the observation value was smaller.The RMSE between the simulated and observed wind speed was small over relatively flat area,while it was larger over complex terrain area.Simulated wind speed was much closer to observations when subgrid-scale terrain parameterization scheme was included in the WRF.Statistics indicated obvious improvement in the accura-cy of simulated wind speed.Although simulated wind speed was higher than observations,the diurnal variations were well captured by all the simulations and the lowest bias was achieved when Jimenez’s parameterization scheme was used.Simulations with Jimenez’s parameterization scheme could precisely capture the spatial distribution feature of wind speed,but simulations with Mass’s parameter-ization scheme had medium improvements at all stations.