| Title: | "Isoprene in urban Atlantic forests: Variability, origin, and implications on the air quality of a subtropical megacity" |
| Author(s): | Dos Santos TC; Dominutti P; Pedrosa GS; Coelho MS; Nogueira T; Borbon A; Souza SR; Fornaro A; |
| Address: | "Universidade de Sao Paulo, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, R. do Matao, 1226 - Butanta, 05508-090 Sao Paulo, SP, Brazil. Electronic address: tailine.atm@gmail.com. Laboratoire de Meteorologie Physique, UMR 6016, CNRS, Universite Clermont Auvergne, 63178 Aubiere, France; Institut des Geosciences de l'Environnement, Universite Grenoble Alpes, CNRS, IRD (UMR 5001), Grenoble, France. Electronic address: pamela.dominutti@ird.fr. Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC - UFABC, Av. dos Estados, 5001 - Bangu, 09210-580 Santo Andre, SP, Brazil. Universidade de Sao Paulo, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, R. do Matao, 1226 - Butanta, 05508-090 Sao Paulo, SP, Brazil. Electronic address: monique.coelho@iag.usp.br. Universidade de Sao Paulo, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, R. do Matao, 1226 - Butanta, 05508-090 Sao Paulo, SP, Brazil. Electronic address: thiago.nogueira@iag.usp.br. Laboratoire de Meteorologie Physique, UMR 6016, CNRS, Universite Clermont Auvergne, 63178 Aubiere, France. Electronic address: A.Borbon@opgc.univ-bpclermont.fr. Botanical Institute of Sao Paulo, Av. Miguel Stefano, 3687 - Vila Agua Funda, 04301-902 Sao Paulo, SP, Brazil. Electronic address: sribeiro@sp.gov.br. Universidade de Sao Paulo, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, R. do Matao, 1226 - Butanta, 05508-090 Sao Paulo, SP, Brazil. Electronic address: adalgiza.fornaro@iag.usp.br" |
| DOI: | 10.1016/j.scitotenv.2022.153728 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Biosphere-atmosphere interactions play a key role in urban chemistry because of biogenic volatile organic compound (BVOC) emissions. Of the BVOC, isoprene is the most emitted compound; however, it also has anthropogenic origins in urban areas. In this study, we aimed to investigate the spatio-temporal variability and atmospheric impacts of biogenic and anthropogenic isoprene in the subtropical megacity of Sao Paulo (MASP), Brazil. Several measurement campaigns were conducted in three different urban Atlantic forests (Matao, PEFI, and RMG), and an urban background site (IAG); this equated to a total of 268 samples for the 2018-2019 period. For all sampling points, daytime average concentrations of isoprene were two to three times higher during the rainy season (IAG: 1.75 +/- 0.93 ppb; Matao: 0.87 +/- 0.35 ppb; PEFI: 0.50 +/- 0.30 ppb; RMG: 0.37 +/- 0.18 ppb), than those observed during the dry season (IAG: 0.46 +/- 0.24 ppb; Matao: 0.31 +/- 0.17 ppb; PEFI: 0.17 +/- 0.11 ppb; RMG: 0.11 +/- 0.07 ppb). Average isoprene concentrations were similar to those observed in other places worldwide, with the exception of the Amazon forest. Our results indicate differences in isoprene concentrations between sites, suggesting that environmental conditions such as the urban heat island and vegetation types, may play a role in spatial variability. Estimates of the isoprene fraction indicated that the biogenic fraction (85%) surpassed the anthropogenic fraction during the rainy season. By contrast, the anthropogenic fraction (52%) exceeded the biogenic fraction during dry periods. These fractions have an impact on potentially forming secondary pollutants gaseous (ozone formation potential: 7.19-33.32 mug m(-3)), and aerosols (secondary organic aerosols formation potential: 0.41-1.88 mug m(-3)). These results highlight the role of biogenic isoprene and its potential impact on urban air quality in subtropical megacities; this requires further investigation under future climate change scenarios" |
| Keywords: | Aerosols *Air Pollutants/analysis *Air Pollution Brazil Butadienes Cities Forests Hemiterpenes Hot Temperature *Volatile Organic Compounds/analysis Air quality Isoprene Megacity South America Urban forest; |
| Notes: | "MedlineDos Santos, Tailine C Dominutti, Pamela Pedrosa, Giselle S Coelho, Monique S Nogueira, Thiago Borbon, Agnes Souza, Silvia R Fornaro, Adalgiza eng Netherlands 2022/02/15 Sci Total Environ. 2022 Jun 10; 824:153728. doi: 10.1016/j.scitotenv.2022.153728. Epub 2022 Feb 11" |
