Download Abstracts Here - IGAC Project

List of Abstracts 38P-Sources.55 ID:4221 15:35An Urban emissions inventory for South America and its application in numerical modeling ofatmospheric chemical composition: Impact on local and regional scales.Marcelo Alonso 1 , Karla Longo 2 , Saulo Freitas 1 , Rafael Fonseca 1 , Virginie Marécal 3 , Michel Pirre 3 ,Laura Klenner 41 CPTEC/INPE2 CCST/INPE3 CNRS and Université d'Orléans4 Universidad de ChileContact: marcelo.alonso@cptec.inpe.brThis work describes the development of an urban vehicle emissions inventory for South America (SA),based on the analysis and aggregation of available inventories for major cities, with emphasis on itsapplication in regional atmospheric chemistry modeling, for the study of chemical composition modificationon SA and its impact on the regional climate change. This database integrates information from localinventories of vehicle emissions into existing global databases for the South American continent. Due to thelimited number of available local inventories, urban emissions were extrapolated based on the correlationbetween city vehicle density and 2004 mobile source emissions of carbon monoxide (CO) and nitrogenoxides (NOx). Emissions were geographically distributed using a methodology that delimits urban areasusing high spatial resolution remote sensing products. This numerical algorithm enabled a more preciserepresentation of urban centers. The derived regional inventory was evaluated by analyzing the performanceof a chemical weather forecast model in relation to observations of CO, NOx and Ozone in two differenturban areas, São Paulo and Belo Horizonte, both important Brazilian metropolitan areas. The gas mixingratios simulated using the proposed regional inventory show good agreement with observations, consistentlyrepresenting their hourly and daily variability. These results show that the integration of municipalinventories in a regional emissions map and their precise distribution in fine scale resolutions are importanttools in regional atmospheric chemistry modeling. In the next phase of this project, we are performingsimulations for recent years in order to study the regional impact of the large urban areas in chemistrycomposition of South America.P-Sources.56 ID:4147 15:35Using inverse modeling techniques to evaluate the new on-road emissions inventory of theMetropolitan Area of Buenos Aires, ArgentinaAriela D'Angiola 1 , Melisa Diaz Resquin 2 , Laura Dawidowski 2 , Dario Gomez 3 , German Torres 41 Atomic Energy Commission of Argentina, San Martin University, Argentina2 Atomic Energy Commission of Argentina, Buenos Aires University, Argentina3 Atomic Energy Commission of Argentina, Buenos Aires University, San Martin University, Argentina4 Cordoba University, ArgentinaContact: adangiola@gmail.comBeing the 10th megacity of the world and the 3rd of Latin America, with an average population density of4,600 inhabitants/km2 and a fleet of 2.4 million vehicles, the Metropolitan Area of Buenos Aires (MABA),Argentina represents a concentrated site of on-road mobile emissions: 815 ton of CO/ km2 at city level vs.0.7 country-wise for the year 2000. In order to better analyze this situation within the SAEMC 4-yearregional project we have developed annual emission inventories of criteria pollutants and greenhouse gasesfrom on-road mobile sources for the year 2006 assessing the level of uncertainty associated with theinventories as well as the impact of emissions factors from different data sources on the computed emissions.Key features of these inventories include (i) the compilation of a regional emissions factors database, thatiCACGP-IGAC 2010 12 July, 2010