S3: Integrated Models for Prediction, Forecasting, and Future Scenario Assessments of Human and Environmental Conditions


Title: A Tool to Evaluate the Air Quality Impact of Industrial emissions (TEAP) by Using MM5-CMAQ: Spain Case

Authors: Roberto San Jose, Juan L. Pèrez, Rosa M. Gonzàlez

Abstract: Industrial plant and particularly new electric power plant are important emission sources generally surrounding large, medium and small cities. Energy forecasts indicate that the growing demand for electricity will require the construction of more electric power plant that use different fuels. In Spain, the growing electricity demand has been met with natural gas fueled combined cycle electric power plant. While the air quality impact associated with the newer technologies is relatively lower when compared to older technologies, modern EU Air Quality legislation requires the control of air quality impact in real-time and forecasting mode. An operational real-time forecasting decision support system system has been developed and implemented in Spain on a 4-unit (400 MW per unit) combined cycle electric power plant, which is located in the surrounding area of Madrid Community (Spain). The system is based on the MM5-CMAQ-EMIMO modelssystem. The MM5 model is widely used all over the world and was developed by PSU/NCAR (USA). The CMAQ model is the so-called Community Multiscale Air Quality Modelling System developed by USEPA. EMIMO is an anthropogenic and biogenic air emissions model , which produces hourly emissions per pollutant per square kilometer. The system is implemented in an 8-node PIV-3, 4 GHz Dell computer cluster to minimize computation time. The system covers three model domains: 405 x 405 km with 9 km spatial resolution; 81 x 99 km with 3 km spatial resolution; and 24 x 24 km with 1 km spatial resolution. The three domains have 23 vertical layers up to 100 mb. The system runs on a daily basis and forecastes up to 72 hours. The system runs all the scenarios needed to obtain the air quality impact of each of the 4-units for every grid cell, hour and air pollutant simulated. The estimated electric power plant emissions are produced on a weekly basis and provided on-line to the modelling system. Changes to expected emissions for the electric power plant are introduced automatically in the modelling system on a daily basis. The system is accessed over the Internet by the environmental authorities and company managers on a daily basis. The system produces alerts every day according to the results of the model. Any decision related to possible shut-down for a limited period of time of the different power plant units , where the EU Directive limits may have been exceeded, is taken by environmental authorities in real-time. The system prototype was part of the EUREKA project TEAP (A tool to evaluate the air quality impact on industrial plant) (2001-2003). The same approach can be used for any other industrial plant and also for any emission source apportionment such as traffic over specific sections of the model domain or even specific pollutants over certain areas in the model domain.