Seminário: Using Internet GPS traffic data for vehicular emissions inventories and air pollution modeling using the R packages VEIN, EmissV, eixport and wrftools

11/05/2018 - 14:00
Auditório Prof. Dr. Paulo Benevides Soares (Rua do Matão, 1226, Cidade Universitária)

O seminário do Departamento de Ciências Atmosféricas será apresentado pelo Dr. Sergio Ibarra
In the first part of the seminar it will be presented the air quality analyses and at the second part important R packages such as sf, stars, and also cptcity and wrftools. 
Most of air pollution simulation in urban environments uses idealized profiles for producing the temporal distribution of emissions estimates. However, the use of this data may not be always representative. With the generation of new data using GPS cell phones and cars for safety reasons, new traffic data is becoming to be available. This study shows the analyses of 104 million GPS recordings to estimate its emissions using the VEIN[1][5] model in the metropolitan area of São Paulo State.  Air quality was simulated with the WRF-Chem model considering the mechanism CBM-Z.  Three domains were designed using wrftools[4], the inner domain had VEIN estimates and outer domains EmissV[2]. WRF-chem inputs were created using eixport[3] and outputs were designed with cptcity[6] . The new emission profile has only one peak and the idealized two, for morning and evening rush hours. The emissions and air quality simulations of gases show good agreement with observations. The vehicular emissions spatial impact on Ozone generation exceeds 70%. Despite that it is known the importance of mobile source, this is the first study showing spatial percentage impact on Ozone generation for São Paulo metropolitana areas.
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