Seminário: Using observations of anthropogenic gaseous organic carbon in urban environments as constraints for emissions

Data: 
03/07/2015 - 14:00
Local: 
Auditório 1 do IAG (Rua do Matão, 1226, Cidade Universitária)


O seminário do Departamento de Ciências Atmosféricas será apresentado pela Dr. Agnès Borbon, LISA (Créteil, France - CNRS, IPSL, University of Paris Est & Paris Diderot)

Using observations of anthropogenic gaseous organic carbon in urban environments as constraints for emissions
Gaseous organic carbon (COG) from anthropogenic sources has several implications on air quality and regional climate change as it contributes to the formation of secondary pollutants like ozone and Secondary Organic Aerosol. The quantification of emissions is a prerequisite to predict its impacts and guide emission reduction policies. While sources of COG are generally well identified, their relative importance is still under debate even in urban areas of post-industrialized countries. Indeed, large uncertainties are often associated with emission amounts, their temporal variability or their chemical composition. The reasons are the multiplicity of sources and compounds which are themselves controlled by various technical and/or environmental parameters and emission inventory methodologies. Regarding such complexity, in-situ observations which reflect, to some extent, emissions and their variability, are relevant and useful evaluation data. During this seminar, I will present the results of recent and on-going work relating to the assessment of urban emissions of anthropogenic COG from in-situ observations in contrasted urban regions with a focus on northern middle latitudes megacities and the Eastern Mediterranean. These observations are based on intensive scientific campaigns (ie. MEGAPOLI-Paris 2009, Calnex-Los Angeles 2010, TRANSEMED since 2012) and the French national air quality monitoring program. These data as a whole have provided a unique opportunity to assess and discuss the seasonality of VOC emissions, their spatial variability regarding regional characteristics and control policies and to evaluate the accuracy of up-to-date emission inventories.