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Photochemical sensitivity to emissions and local meteorology in Bogotá, Santiago, and São Paulo: An analysis of the initial COVID-19 lockdowns

Publicado por
Seguel, Rodrigo J., Gallardo, Laura, Osses, Mauricio, Rojas, Néstor Y., Nogueira, Thiago, Menares, Camilo, Andrade, Maria de Fatima, Belalcázar, Luis C., Carrasco, Paula, Eskes, Henk, Fleming, Zoë L., Huneeus, Nicolas, Ibarra-Espinosa, Sergio, Landulfo, Eduardo, Leiva, Manuel, Mangones, Sonia C., Morais, Fernando G., Moreira, Gregori A., Pantoja, Nicolás, Parraguez, Santiago, Rojas Quincho, Jhojan Pool, Rondanelli, Roberto, Andrade, Izabel da Silva, Toro, Richard, Yoshida, Alexandre C.

Publicado 2022

Enlace

This study delves into the photochemical atmospheric changes reported globally during the pandemic by analyzing the change in emissions from mobile sources and the contribution of local meteorology to ozone (O3) and particle formation in Bogotá (Colombia), Santiago (Chile), and São Paulo (Brazil). The impact of mobility reductions (50%–80%) produced by the early coronavirus-imposed lockdown was assessed through high-resolution vehicular emission inventories, surface measurements, aerosol optical depth and size, and satellite observations of tropospheric nitrogen dioxide (NO2) columns. A generalized additive model (GAM) technique was also used to separate the local meteorology and urban patterns from other drivers relevant for O3 and NO2 formation. Volatile organic compounds, nitrogen oxides (NOx), and fine particulate matter (PM2.5) decreased significantly due to motorized trip reduc...