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Development , Implementation and Evaluation of a Physics-Base Windblown Dust Emission Model
Citation:
Foroutan, H., Jeff Young, P. Liu, L. Ran, Jon Pleim, AND R. Mathur. Development , Implementation and Evaluation of a Physics-Base Windblown Dust Emission Model. ITM 2016: 35th International Technical Meeting on Air Pollution Modeling and Its Application, Crete, GREECE, October 03 - 07, 2016.
Impact/Purpose:
The National Exposure Research Laboratory (NERL) Computational Exposure Division (CED) develops and evaluates data, decision-support tools, and models to be applied to media-specific or receptor-specific problem areas. CED uses modeling-based approaches to characterize exposures, evaluate fate and transport, and support environmental diagnostics/forensics with input from multiple data sources. It also develops media- and receptor-specific models, process models, and decision support tools for use both within and outside of EPA.
Description:
A physics-based windblown dust emission parametrization scheme is developed and implemented in the CMAQ modeling system. A distinct feature of the present model includes the incorporation of a newly developed, dynamic relation for the surface roughness length, which is important in correctly predicting both the friction velocity and the roughness correction factor used in the dust emission model. Careful attention is paid in integrating the new dust module within the CMAQ to ensure the required input parameters are correctly configured. The model is evaluated for two test cases including the continental United States and the North-ern hemisphere, and is shown to be able to capture the occurrence of the dust out-break and the level of the soil concentration.
