Because of the relative larger mesh-grids, meso-scale atmospheric models cannot fully capture the spatial and temporal variability of near-surface wind fields over complex terrain, whereas the large turbulence-eddy resolving LES is a more promising model to account for this challenge. This paper performs a real-case near-surface wind simulation test over acrid lakeshore area close to Bosteng Lake in Xinjiang province utilizing the WRF-LES model with six nested domains. The simulation period is 28 hours and the model results were verified and analyzed against in-situ observations for one day. To assess the sensitivity of model results to local land-surface characteristics, three sensitivity tests were conducted by varying parameters such as the terrain resolution, soil-moist and surface roughness. For one sensitivity test, two digital elevation datasets were used, one is ASTER GDEM with 1 sec resolution and the other is MODIS with 30 sec resolution. For the other two sensitivity tests, disturbance factor with values 0. 4 through 2. 8 was used respectively to change the properties of land-surface. The test results demonstrate that the WRF-LES is more capable to regenerate the near-surface wind than meso-scale simulations in small-scale region with complex terrain owing to its explicit resolving of large atmospheric turbulence eddies. Thus the time series of wind speeds and wind directions more resemble the real atmosphere than those of meso-scale simulations. And the spectra of wind speeds is also more preferable. The sensitivity tests showed that the resolution of terrain data can affect the simulation results significantly so it should be treated with care. By increasing soil-moist the allocation of daytime land-surface heat fluxes is altered, thus the strength of large eddies is increased and so do the near-surface wind speeds, whereas the impact of surface roughness on model results is more complex. For one hand, increasing Z0 will enhance the transportation of momentum from upper air to near-surface flow, for another hand, larger value of Z0 is a negative factor when the wind speeds at 10 m height to be diagnosed by the land-surface model based on the Monin-Obukhov similarity theory and the atmospheric stability condition should be considered when analyze the impact of Z0 on near-surface wind speeds.
SUN Xuejin
,
LI Yan
,
ZHANG Yanhong
,
NING Hui
,
TANG Jing
,
WEN Yuanhong
,
MIAO Qingjian
. Near-Surface Wind Simulation over Acrid Lakeshore Area and Sensitivity Studies using the WRF-LES[J]. Plateau Meteorology, 2017
, 36(3)
: 835
-844
.
DOI: 10.7522/j.issn.1000-0534.2016.00058
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