Seminar on Air Quality Forecasting - 1 – Niels Bohr Institute - University of Copenhagen

Niels Bohr Institute > Calendar > 2010 > Seminar on Air Quality...

Seminar on Air Quality Forecasting - 1

Development and Application of Global-Through-Urban and Mesoscale WRF/Chem

Talk by Yang Zhang, Air Quality Forecasting Laboratory, Department of Marine, Earth, and Atmospheric Sciences North Carolina State University, Raleigh, NC, USA

Abstract: The climate-air quality feedbacks are important at all scales. Accurately simulating those feedbacks requires fully-coupled meteorology, climate, and chemistry models and presents significant challenges in terms of both scientific understanding and computational demand. China, one of the regions with the largest population and the worst air pollution in the world, provides an ideal testbed for studying such interactions in contrast to the U.S., where emission control strategies have been effectively enforced. In this study, a unified Global-through-Urban Weather Research and Forecasting Model with Chemistry (GU-WRF/Chem) is being developed at North Carolina State University to study air quality-climate interactions. The model is being applied to simulate direct aerosol effects via absorption and scattering and indirect aerosol effects via serving as cloud condensation nuclei (CCN) and affecting cloud droplet number concentration (CDNC) under both current-year and future-year climate and emission scenarios. Nested simulations are conducted over multiple domains such as a global domain at 4˚ (Lat) × 5˚ (Lon), a Trans-Pacific domain covering Asia, Pacific, and North America at 1.0˚ × 1.25˚, the continental U.S. and China at 0.33˚ × 0.42˚, and the eastern U.S. at 0.08˚ × 0.10˚. Model performance evaluation using surface and satellite data is conducted to assess the capability of the model to reproduce meteorological and chemical observations. The important feedbacks of gases and aerosols to simulated boundary layer meteorology, radiation, and cloud/precipitation formation as well as associated seasonalities are studied. The impact of climate change and projected emissions in future years on air quality is examined. Major challenges in simulating climate-air quality interactions will be discussed.

Short Biography: Yang Zhang is a Professor in the Department of Marine, Earth, and Atmospheric Sciences at North Carolina State University (NCSU), Raleigh, NC. Her research interests include air pollution modeling and assessment, atmospheric chemistry and transport cloud/aerosol chemistry and microphysics, sensitivity and uncertainty analysis, and interactions among chemistry, meteorology, and climate change. She has led or contributed to the development, application, evaluation, and improvement of several major three-dimensional models on urban, regional, and global scales including STEM III, GChM, MIRAGE, SCICHEM, CMAQ, CMAQ-MADRID, CAMx, MM5, WRF, and mesoscale and global-through-urban WRF/Chem and WRF/Chem-MADRID.

The talk by Yang Zhang is the first of two talks in a seminar about air quality forecasting.

10:00 - 11:00 Yang Zhang: Development and Application of Global-Through-Urban and Mesoscale WRF/Chem

11:00 - 11:15 coffee

11:15 - 12:15  Christian Seigneur: Overview of Secondary Organic Aerosol Modeling for Atmospheric Particulate Matter and Recent Developments in Data Assimilation for Air Quality Forecasting