Resultados de Búsqueda por Autor

1

artículo

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...

2

artículo

Ozone and volatile organic compounds in the metropolitan area of Lima-Callao, Peru

Publicado por
Silva, José, Rojas Quincho, Jhojan Pool, Norabuena Espinoza, Magdalena, Seguel, Rodrigo J.

Publicado 2018

Enlace

This study analyzes ozone formation in the metropolitan area of Lima-Callao as a function of meteorological patterns and the concentrations of nitrogen oxides and reactive organic gases. The study area is located on the west coast of South America (12°S) in an upwelling region that is markedly affected by the Southeast Pacific anticyclone. The vertical stability and diurnal evolution of the mixing layer were analyzed from radiosondes launched daily during 1992–2014 and from two intensive campaigns in 2009. Vertical profiles show that during June–November, the subsidence inversion base ranges from 0.6 to 0.9 km above sea level (asl). In contrast, during December–May, subsidence inversion dissipates, leading to weak surface inversions from 0.1 to 0.6 km asl. At the surface level, compliance with the ozone standard of 51 parts per billion by volume (ppbv) is explained by the marine b...

3

artículo

A global observational analysis to understand changes in air quality during exceptionally low anthropogenic emission conditions

Publicado por
Sokhi, Ranjeet S., Singh, Vikas, Querol, Xavier, Finardi, Sandro, Targino, Admir Créso, Andrade, Maria de Fatima, Pavlovic, Radenko, Garland, Rebecca M., Massagué, Jordi, Kong, Shaofei, Baklanov, Alexander, Ren, Lu, Tarasova, Oksana, Carmichael, Greg, Peuch, Vincent-Henri, Anand, Vrinda, Arbilla, Graciela, Badali, Kaitlin, Beig, Gufran, Belalcazart, Luis Carlos, Bolignano, Andrea, Brimblecombe, Peter, Camacho, Patricia, Casallas, Alejandro, Charland, Jean-Pierre, Choi, Jason, Chourdakis, Eleftherios, Coll, Isabelle, Collins, Marty, Cyrys, Josef, Cleyton, Martins, da Silva, Cleyton Martins, Di Giosa, Alessandro Domenico, Di Leo, Anna, Ferro, Camilo, Gavidia-Calderon, Mario, Gayen, Amiya, Ginzburg, Alexander, Godefroy, Fabrice, Gonzalez, Yuri Alexandra, Guevara-Luna, Marco, Haque, Mafizul, Havenga, Henno, Herod, Dennis, Horrak, Urmas, Hussein, Tareq, Ibarra, Sergio, Jaimes, Monica, Kaasik, Marko, Khaiwal, Ravindra, Kim, Jhoon, Kousa, Anu, Kukkonen, Jaakko, Kulmala, Markku, Kuula, Joel, La Violette, Nathalie, Lanzani, Guido, Liu, Xi, MacDougall, Stephanie, Manseau, Patrick M., Marchegiani, Giada, McDonald, Brian, Vardhan Mishra, Swasti, Molina, Luisa T., Mooibroek, Dennis, Mor, Suman, Moussiopoulos, Nicolas, Murena, Fabio, Niemi, Jarkko V., Noe, Steffen, Nogueira, Thiago, Norman, Michael, Pérez-Camaño, Juan Luis, Petajä, Tuukka, Piketh, Stuart, Rathod, Aditi, Reid, Ken, Retama, Armando, Rivera, Olivia, Rojas, Néstor Y., Rojas Quincho, Jhojan Pool, San José, Roberto, Sanchez, Odón R., Seguel, Rodrigo J., Sillanpää, Salla, Su, Yushan, Tapper, Nigel, Terrazas, Antonio, Timonen, Hilkka, Toscano, Domenico, Tsegas, George, Velders, Guus J.M., Vlachokostas, Christos, von Schneidemesser, Erika, VpM, Rajasree, Ravi, Yadav, Zalakeviciute, Rasa, Zavala, Miguel

Publicado 2021

Enlace

This global study, which has been coordinated by the World Meteorological Organization Global Atmospheric Watch (WMO/GAW) programme, aims to understand the behaviour of key air pollutant species during the COVID-19 pandemic period of exceptionally low emissions across the globe. We investigated the effects of the differences in both emissions and regional and local meteorology in 2020 compared with the period 2015–2019. By adopting a globally consistent approach, this comprehensive observational analysis focuses on changes in air quality in and around cities across the globe for the following air pollutants PM2.5, PM10, PMC (coarse fraction of PM), NO2, SO2, NOx, CO, O3 and the total gaseous oxidant (OX = NO2 + O3) during the pre-lockdown, partial lockdown, full lockdown and two relaxation periods spanning from January to September 2020. The analysis is based on in situ ground-based ai...