Ponentes
Descripción
Associated with increasing worldwide urbanization, and despite efforts made to reduce airborne concentrations of primary pollutants, air quality remains a concern in urban areas. Especially during short-term pollution episodes that can lead to exceedances of air quality standards. Furthermore, exposure to elevated levels of air pollution may result in various adverse health effects.
In Canada, a high percentage of the population (~81%, according to the 2011 Census) living in urban areas may be exposed to urban pollution. To improve services for Canadians, Environment and Climate Change Canada (ECCC) has developed a high-resolution air quality forecasting capability for urban areas. Because urban air quality (AQ) is influenced by a variety of factors including meteorology, urban infrastructure, local emissions and regional background, it is important to combine all the factors in an integrated model system.
As a part of the ECCC effort, the operational Regional Air Quality Deterministic Prediction System (RAQDPS) has been reconfigured to provide 48-hours air quality forecasts at model grid resolutions of 2.5km. The proposed urban AQ system, referred as High Resolution Air Quality Deterministic Prediction System (HRAQDPS), relies on the configurations of the operational High Resolution Deterministic Prediction System (HRDPS) for meteorology, and the Global Environmental Multiscale model - Modelling Air quality and Chemistry (GEM-MACH) system for chemistry. The HRDPS system also includes the Town Energy Balance (TEB) urban surface scheme.
The HRAQDPS uses initial surface and hydrometeor fields from a high-resolution land assimilation system and a forecast cycle at 2.5km respectively. The system has been tested on a small domain over east North America and compared to the operational RAQDPS system.
This presentation will describe the HRAQDPS system as well as sensitivity tests and model performance during the summer 2019 and winter 2020 periods. The planning for the short and long-term HRAQDPS development will also be discussed.
