Numerical Simulation of ANATEX Tracer Data Using a Turbulence Closure Model for Long-Range Dispersion
| Autor: | D. S. Henn, W. S. Lewellen, R. I. Sykes, S. F. Parker |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Journal of Applied Meteorology. 32:929-947 |
| ISSN: | 1520-0450 0894-8763 |
| DOI: | 10.1175/1520-0450(1993)032<0929:nsoatd>2.0.co;2 |
| Popis: | A long-range transport model based on turbulence closure concepts is described. The model extends the description of planetary boundary layer turbulent diffusion to the larger scales and uses statistical wind information to predict contaminant dispersion. The model also contains a prediction of the statistical fluctuations in the tracer concentration resulting from the unresolved velocity fluctuations. The dispersion calculation is made by means of a Lagrangian puff representation, allowing the use of time-dependent three-dimensional flow fields. Predictions of the ANATEX (Across North America Tracer Experiment) releases are compared with observations. Both 24-h average surface and short-term aircraft sampler concentrations are calculated using the high-resolution wind fields from the NMC Nested Grid Model. The statistical prediction is also tested using long-term average wind data. Statistical uncertainty in the predictions, due to the unresolved wind fluctuations, is found to be small for the 2... |
| Databáze: | OpenAIRE |
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