The Use of High Resolution Mesoscale Model Field with the 随着高分辨率的中尺度数值模式领域的应用.pptVIP

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2018-06-19 发布于福建
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The Use of High Resolution Mesoscale Model Field with the 随着高分辨率的中尺度数值模式领域的应用.ppt

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The Use of High Resolution Mesoscale Model Field with the 随着高分辨率的中尺度数值模式领域的应用

The Use of High Resolution Mesoscale Model Fields with the CALPUFF Dispersion Modelling System in Prince George BC CALPUFF A Dispersion modelling system composed of 3 separate modules: CALMET – a meteorological model, constructs 3-dimensional fields of wind, temperature and other variables from local observations. Deterministic in nature. Requires upper air data as well as data from at least one surface station. CALPUFF – a Gaussian Puff dispersion model, predicts 3-dimensional fields of pollutant concentrations. Requires CALMET fields and an inventory of pollutant sources and emission rates. CALPOST – a post processor that extracts pollutant concentrations from CALPUFF fields. RAMS A prognostic (forecasting) mesoscale model, able to simulate circulations from hemispheric in scale down to 100’s of metres. Smaller grids are nested within larger parent grids when higher resolution is required. Calculates meteorological variables each time step. Smaller grid sizing requires a smaller time step and therefore more calculations. Significant computer resources needed. SGI Origin 3400 ‘Fraser’ used at the HPC facility at UNBC. A “HINDCAST” instead of a “FORECAST” For regulatory modelling, a meteorological period in the past is used for dispersion analysis. RAMS is therefore used to make a “hindcast” of what the atmosphere was like during the period. ‘Nearby’ observations are used as boundary conditions to guide RAMS’ simulations. Predictions are periodically ‘corrected’ on the large scale. Numerical models such as RAMS are able to ‘telescope down’ from the large scale motions to predict circulations on a local scale. The influence of topography, vegetation, bodies of water, radiation etc. are accounted for by the model. Research Objectives (Can simulated meteorology (RAMS fields) be used in lieu of meteorological observations to perform dispersion modelling in an area of complex terrain??) To assess the use of RAMS fields in producing high quality CALMET