12th Conference on Mountain Meteorology


Super-high-resolution numerical simulation of atmospheric turbulence in an area of complex terrain

P. W. Chan, Hong Kong Observatory, Hong Kong, China

This work studies the atmospheric turbulence in cross-mountain airflow at the Hong Kong International Airport (HKIA) using Regional Atmospheric Modelling System (RAMS) version 4.4 with a horizontal grid size of 50 m. Deardorff turbulence parameterization scheme is employed in the innermost model domain. The model directly calculates the eddy dissipation rate (EDR), a metric for turbulence intensity in aviation, and the results are compared with LIDAR measurements of EDR.

In the nesting run of the numerical model at this super-high spatial resolution, one major challenge is the lack of an appropriate turbulence parameterization scheme in the 'intermediate' length scale in the order of several hundred metres. The sensitivity of the modelling results to the choice of the turbulence parameterization scheme in this 'intermediate' scale will be discussed.

extended abstract  Extended Abstract (1.7M)

Poster Session 1, Precipitation and Boundary Layers in Complex Terrain
Monday, 28 August 2006, 2:30 PM-4:00 PM, Ballroom North

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