One decade of VOCs measurements in São Paulo megacity: Composition, variability, and emission evaluation in a biofuel usage context

Dominutti, Pamela; Nogueira, Thiago; Fornaro, Adalgiza; Borbon, A.

doi:10.1016/j.scitotenv.2020.139790

Cited by 30 publications

(23 citation statements)

References 59 publications

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“…These compounds were among the 20 HCs with the highest concentration at the CETESB IPEN/USP AMS during 2011/2012, except for benzene, maintaining the same characteristics of the comparisons between the tunnel campaigns in 2004 with the CETESB IPEN/USP AMS in 2006. Similar results were found by Dominutti et al (2016Dominutti et al ( , 2020 for SPMA, with the most abundant NMHC propane, ethylene, ethane, acetylene, 2,2,4-trymethylpentane, i-propyl benzene, n-butane, toluene, i-pentane and propylene.…”

Section: Concentrations Of Volatile Organicsupporting

confidence: 84%

“…VOCs were measured during the 2006 and 2011-2012 campaigns, in which criteria pollutants and meteorological parameters were also measured. These previous studies were detailed in Alvim et al (2014Alvim et al ( , 2017Alvim et al ( , 2018 e Orlando et al (2010), as well as a comparison with other recent studies for the city of São Paulo (Dominutti et al, 2020;Dominutti et al, 2016;Nogueira et al, 2014;Pérez-Martínez et al, 2014;Salvo & Geiger, 2014).…”

Section: Concentrations Of Volatile Organic Compounds In the Megacitymentioning

confidence: 89%

“…Concentrations of aldehydes in the environment is regulated by an increase in consumption of ethanol is demonstrated in a recent study of the seasonal variation in the concentrations of formaldehyde and acetaldehyde based on a 5-year measurements in SPMA which showed an increase of about 60 % and 40 % respectively in both the compounds that is from 1.35 to 2.80 ppb/ppm ERs for formaldehyde and 2.08 to 2.93 ppb/ppm ERs for acetaldehyde in 2015 . The increase in the emission ratios (ER) could be associated to the change in the fuel consumption observed, characterized by an increase in the ethanol and bio-diesel sales and a decrease in the gasohol sales in 2015 (Dominutti et al, 2020). According to Branco & Branco (2007), drivers Figure 2 Ethanol, acetaldehyde, formaldehyde, acetone, acrolein and HC at CETESB IPEN/USP AMS during 2011/2012.…”

Section: Concentrations Of Volatile Organic Compounds In the Megacitymentioning

confidence: 99%

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Concentrations of Volatile Organic Compounds in the Megacity of São Paulo in 2006 and 2011/2012 - A Comparative Study

et al. 2020

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The focus of this study was to measure the Volatile Organic Compounds (VOCs) concentrations in the megacity – São Paulo Metropolitan Area (SPMA). The measurements analyzed in this study included 78 hydrocarbon (HC) samples collected during 2006, and 66 samples of HC, 62 of aldehydes and 42 of ethanol collected during 2011-2012. The observational results showed that the consumption of ethanol, gasoline and diesel from 2006 to 2012 increased by 64 %, 23 % and 25 %, respectively, with substantial changes in the atmospheric composition. The 10 most abundant VOCs in the atmosphere found during 2011/2012 at CETESB IPEN/USP air quality monitoring station were ethanol, acetaldehyde, formaldehyde, acetone, propane, ethene, ethane, butane, 1-ethyl-4-methyl benzene, and 1,2,4-trimethyl benzene. During the 2006 campaign, alkanes represented 54.8 % of the total HC concentration, alkenes 29.2 %, aromatics 13.6 %, and alkadienes 2.4 %. On the other hand, during the 2011-2012 campaign, aldehydes represented 35.3 % of the VOCs, ethanol 22.6 %, aromatics 15.5 %, alkanes 13.5 %, acetone 6.8 %, alkenes 6.0 %, and alkadienes with less than 0.1 %. An increase in VOCs concentrations in the SPMA atmosphere from 2006 to 2012, such as aldehydes and aromatics (which are important ozone precursors) was measured.

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Section: Concentrations Of Volatile Organicsupporting

confidence: 84%

Section: Concentrations Of Volatile Organic Compounds In the Megacitymentioning

confidence: 89%

Section: Concentrations Of Volatile Organic Compounds In the Megacitymentioning

confidence: 99%

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Concentrations of Volatile Organic Compounds in the Megacity of São Paulo in 2006 and 2011/2012 - A Comparative Study

et al. 2020

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“…Furthermore, its deposition on plant leaves affects their photosynthesis and evaporation ability, hence damaging crop yields (Hill and Littlefield, 1969). Tropospheric O 3 is also a powerful greenhouse gas (GHG) and a photochemical oxidant that plays a key role in the atmosphere (Ehhalt et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in atmospheric pollutants transport in central Chile: dynamics and consequences

Lapere¹,

Menut²,

Mailler³

et al. 2021

Atmos. Chem. Phys.

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Abstract. Central Chile faces atmospheric pollution issues all year long as a result of elevated concentrations of fine particulate matter during the cold months and tropospheric ozone during the warm season. In addition to public health issues, environmental problems regarding vegetation growth and water supply, as well as meteorological feedback, are at stake. Sharp spatial gradients in regional emissions, along with a complex geographical situation, make for variable and heterogeneous dynamics in the localization and long-range transport of pollutants, with seasonal differences. Based on chemistry–transport modeling with Weather Research Forecasting (WRF)–CHIMERE, this work studies the following for one winter period and one summer period: (i) the contribution of emissions from the city of Santiago to air pollution in central Chile, and (ii) the reciprocal contribution of regional pollutants transported into the Santiago basin. The underlying 3-dimensional advection patterns are investigated. We find that, on average for the winter period, 5 to 10 µg m−3 of fine particulate matter in Santiago come from regional transport, corresponding to between 13 % and 15 % of average concentrations. In turn, emissions from Santiago contribute between 5 % and 10 % of fine particulate matter pollution as far as 500 km to the north and 500 km to the south. Wintertime transport occurs mostly close to the surface. In summertime, exported precursors from Santiago, in combination with mountain–valley circulation dynamics, are found to account for most of the ozone formation in the adjacent Andes cordillera and to create a persistent plume of ozone of more than 50 ppb (parts per billion), extending along 80 km horizontally and 1.5 km vertically, and located slightly north of Santiago, several hundred meters above the ground. This work constitutes the first description of the mechanism underlying the latter phenomenon. Emissions of precursors from the capital city also affect daily maxima of surface ozone hundreds of kilometers away. In parallel, cutting emissions of precursors in the Santiago basin results in an increase in surface ozone mixing ratios in its western area.

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“…However, the good reproduction of both O 3 and NO x advocates in favor of the production of adequate levels of VOC, at least in the Santiago area. In addition, although such a work is yet to be done for Chile, comparisons of HTAP emissions of VOC with more refined national inventories in South America show that despite a spatial distribution and speciation profile with margin for improvement, total amounts of emitted VOC as provided by HTAP are well in the range of higher resolution inventories based on local observations for Argentina (Puliafito et al, 2017) and São Paulo (Dominutti et al, 2020). In parallel, emissions of NO x and PM 10 from HTAP for the region of Santiago show similar biases and discrepancies as other mega-cities in South America such as Buenos Aires and Rio de Janeiro (Huneeus et al, 2020), so that we can assume this similarity also applies for VOC.…”

Section: Simulation Validationmentioning

confidence: 99%

Referee comment on acp-2020-1249

2021

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Central Chile faces atmospheric pollution issues all year long, in relation with elevated concentrations of fine particulate matter during the cold months and tropospheric ozone during the warm season. In addition to public health issues, environmental problems regarding vegetation growth and water supply, as well as meteorological feedback are at stake. Sharp spatial gradients in regional emissions along with a complex geographical situation make for variable and heterogeneous dynamics in the localization and long-range transport of pollutants, with seasonal differences. Based on chemistry-transport modeling with WRF-CHIMERE, this work studies for one winter period and one summer period: (i) the contribution of emissions from the Santiago Metropolitan Area to air pollution in central Chile, (ii) the reciprocal contribution of regional pollutants transported into the Santiago basin. The underlying 3-dimensional advection patterns are investigated. We find that on average for the winter period 5 µg m −3 to 10 µg m −3 of fine particulate matter in Santiago come from regional transport, corresponding to 13% to 15% of average concentrations. In turn, emissions from the Metropolitan Area contribute to 5% to 10% of fine particulate matter pollution as far as 4 • north and 4 • south. Wintertime transport occurs mostly close to the surface.In summertime, exported precursors from Santiago, in combination with mountain-valley circulation dynamics, are found to account for most of ozone formation in the adjacent Andes cordillera and to create a persistent plume of ozone of more than 50 ppb, extending along 80 km horizontally and 1.5 km vertically, and located several hundred meters above ground, slightly north of Santiago. This work constitutes the first description of such an ozone bubble formation mechanism. Emissions of precursors from the capital city also affect daily maxima of surface ozone hundreds of kilometers away. In parallel, cutting emissions of precursors in the Santiago basin results in an increase of surface ozone mixing ratios in its western area. IntroductionMost urban areas in central Chile, including the capital city Santiago, deal with harmful atmospheric concentrations of fine particulate matter (PM 2.5 ) in wintertime (

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One decade of VOCs measurements in São Paulo megacity: Composition, variability, and emission evaluation in a biofuel usage context

Cited by 30 publications

References 59 publications

Concentrations of Volatile Organic Compounds in the Megacity of São Paulo in 2006 and 2011/2012 - A Comparative Study

Concentrations of Volatile Organic Compounds in the Megacity of São Paulo in 2006 and 2011/2012 - A Comparative Study

Seasonal variation in atmospheric pollutants transport in central Chile: dynamics and consequences

Referee comment on acp-2020-1249

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