Seminar on Air Quality Forecasting - 2 – Niels Bohr Institute - University of Copenhagen

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

Seminar on Air Quality Forecasting - 2

Overview of Secondary Organic Aerosol Modeling for Atmospheric Particulate Matter and Recent Developments in Data Assimilation for Air Quality Forecasting

Talk by Christian Seigneur, Cerea, Joint Laboratory École des Ponts ParisTech/EDF R&D, Université Paris-Est

Abstract: Fine particulate matter (PM2.5, i.e., those particles with an aerodynamic diameter of less than 2.5 microns) can lead to adverse respiratory and cardio-vascular health effects. PM2.5 includes both primary (i.e., emitted directly in the atmosphere as particles) and secondary (i.e., formed in the atmosphere from condensation of gases) components. The secondary fraction is generally dominant except near sources of primary PM. Furthermore, organic species constitute a significant fraction of secondary PM2.5. It is, therefore, essential to understand the origins of organic PM2.5 to develop efficient emission control strategies of its gaseous precursors.

Several approaches are available to model the formation of secondary organic aerosols (SOA). The most commonly used approaches include the fitted-yield approach (also referred to as the two-product Odum approach), the volatility basis-set (VBS) approach, and the hydrophobic/hydrophilic organic (H2O) aerosol approach. The pros and cons of these three approaches will be discussed. Historically, most models have used the fitted-yield approach. Over the past few years, the VBS approach has been increasingly used for applications in North America, whereas the H2O approach has been developed further to be compatible with any gas-phase mechanism and has been incorporated in several European air quality models. Recent work on SOA formation from isoprene will be presented. Examples will be given for regional model simulations and compared to available measurements. Recommendations for further model development and future prospects will be discussed.

Recent developments in data assimilation for air quality forecasting conducted at Cerea will also be briefly presented.

Short Biography: Christian Seigneur is currently a professor at École des Ponts ParisTech, the top civil and engineering graduate school in France, and the director of its Atmospheric Environment Center, Cerea. He has been an advisor to the U.S. Environmental Protection Agency for the regulation of several atmospheric pollutants including the first PM2.5 regulations and the recent NO2 regulation. His research focuses primarily on atmospheric aerosols and the impact of road traffic on air quality.

The talk by Christian Seigneur is the second 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