Artigos de revistas sobre o tema "Oxygenated Volatile Organic Compounds of Biogenic Origin (VOCB)"

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1

Debevec, Cécile, Stéphane Sauvage, Valérie Gros, et al. "Origin and variability in volatile organic compounds observed at an Eastern Mediterranean background site (Cyprus)." Atmospheric Chemistry and Physics 17, no. 18 (2017): 11355–88. http://dx.doi.org/10.5194/acp-17-11355-2017.

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Abstract. More than 7000 atmospheric measurements of over 60 C2 − C16 volatile organic compounds (VOCs) were conducted at a background site in Cyprus during a 1-month intensive field campaign held in March 2015. This exhaustive dataset consisted of primary anthropogenic and biogenic VOCs, including a wide range of source-specific tracers, and oxygenated VOCs (with various origins) that were measured online by flame ionization detection–gas chromatography and proton transfer mass spectrometry. Online submicron aerosol chemical composition was performed in parallel using an aerosol mass spectrom
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2

Langford, B., E. Nemitz, E. House, et al. "Fluxes and concentrations of volatile organic compounds above central London, UK." Atmospheric Chemistry and Physics Discussions 9, no. 4 (2009): 17297–333. http://dx.doi.org/10.5194/acpd-9-17297-2009.

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Abstract. Concentrations and fluxes of eight volatile organic compounds (VOCs) were measured during October 2006 from a high telecom tower above central London, as part of the CityFlux contribution to the REPARTEE I campaign. A continuous flow disjunct eddy covariance technique with analysis by proton transfer reaction mass spectrometry was used. Daily averaged VOC mixing ratios were within the range 1–19 ppb for the oxygenated compounds (methanol, acetaldehyde and acetone) and 0.2–1.3 ppb for the aromatics (benzene, toluene and ethylbenzene). Typical VOC fluxes were in the range 0.1–1.0 mg m−
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3

Langford, B., E. Nemitz, E. House, et al. "Fluxes and concentrations of volatile organic compounds above central London, UK." Atmospheric Chemistry and Physics 10, no. 2 (2010): 627–45. http://dx.doi.org/10.5194/acp-10-627-2010.

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Abstract. Concentrations and fluxes of eight volatile organic compounds (VOCs) were measured during October 2006 from a high telecom tower above central London, as part of the CityFlux contribution to the REPARTEE I campaign. A continuous flow disjunct eddy covariance technique with analysis by proton transfer reaction mass spectrometry was used. Daily averaged VOC mixing ratios were within the range 1–19 ppb for the oxygenated compounds (methanol, acetaldehyde and acetone) and 0.2–1.3 ppb for the aromatics (benzene, toluene and C2-benzenes). Typical VOC fluxes were in the range 0.1–1.0 mg m−2
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4

Michoud, Vincent, Jean Sciare, Stéphane Sauvage, et al. "Organic carbon at a remote site of the western Mediterranean Basin: sources and chemistry during the ChArMEx SOP2 field experiment." Atmospheric Chemistry and Physics 17, no. 14 (2017): 8837–65. http://dx.doi.org/10.5194/acp-17-8837-2017.

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Abstract. The ChArMEx (Chemistry and Aerosols Mediterranean Experiments) SOP2 (special observation period 2) field campaign took place from 15 July to 5 August 2013 in the western Mediterranean Basin at Ersa, a remote site in Cape Corse. During the campaign more than 80 volatile organic compounds (VOCs), including oxygenated species, were measured by different online and offline techniques. At the same time, an exhaustive description of the chemical composition of fine aerosols was performed with an aerosol chemical speciation monitor (ACSM). Low levels of anthropogenic VOCs (typically tens to
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5

Johnson, D., S. R. Utembe, and M. E. Jenkin. "Simulating the detailed chemical composition of secondary organic aerosol formed on a regional scale during the TORCH 2003 campaign in the southern UK." Atmospheric Chemistry and Physics Discussions 5, no. 4 (2005): 7875–902. http://dx.doi.org/10.5194/acpd-5-7875-2005.

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Abstract. Following on from the companion study (Johnson et al., 2005a), a photochemical trajectory model (PTM) has been used to simulate the chemical composition of organic aerosol for selected events during the 2003 TORCH (Tropospheric Organic Chemistry Experiment) field campaign. The PTM incorporates the speciated emissions of 124 non-methane anthropogenic volatile organic compounds (VOC) and three representative biogenic VOC, a highly-detailed representation of the atmospheric degradation of these VOC, the emission of primary organic aerosol (POA) material and the formation of secondary or
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Johnson, D., S. R. Utembe, and M. E. Jenkin. "Simulating the detailed chemical composition of secondary organic aerosol formed on a regional scale during the TORCH 2003 campaign in the southern UK." Atmospheric Chemistry and Physics 6, no. 2 (2006): 419–31. http://dx.doi.org/10.5194/acp-6-419-2006.

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Abstract. Following on from the companion study (Johnson et al., 2006), a photochemical trajectory model (PTM) has been used to simulate the chemical composition of organic aerosol for selected events during the 2003 TORCH (Tropospheric Organic Chemistry Experiment) field campaign. The PTM incorporates the speciated emissions of 124 non-methane anthropogenic volatile organic compounds (VOC) and three representative biogenic VOC, a highly-detailed representation of the atmospheric degradation of these VOC, the emission of primary organic aerosol (POA) material and the formation of secondary org
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7

Seco, R., J. Peñuelas, I. Filella, et al. "Volatile organic compounds in the Western Mediterranean Basin: urban and rural winter measurements during the DAURE campaign." Atmospheric Chemistry and Physics Discussions 12, no. 11 (2012): 30909–50. http://dx.doi.org/10.5194/acpd-12-30909-2012.

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Abstract. Atmospheric volatile organic compounds (VOCs) have key environmental and biological roles, but little is known about the daily VOC mixing ratios in Mediterranean urban and natural environments. We measured VOC mixing ratios concurrently at an urban and a rural site during the winter DAURE campaign in the northeastern Iberian Peninsula. All VOC mixing ratios measured were higher at the urban site (e.g. acetaldehyde, isoprene, benzene, and toluene with averages up to 1.68, 0.31, 0.58 and 2.71 ppbv, respectively), with the exception of some short chain oxygenated VOCs such as acetone (w
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8

Ait-Helal, W., A. Borbon, S. Sauvage, et al. "Volatile and intermediate-volatility organic compounds in sub-urban Paris: variability, origin and importance for SOA formation." Atmospheric Chemistry and Physics Discussions 14, no. 4 (2014): 4841–904. http://dx.doi.org/10.5194/acpd-14-4841-2014.

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Abstract. Measurements of gaseous and particulate organic carbon were performed during the MEGAPOLI experiments, in July 2009 and January–February 2010, at the SIRTA observatory in sub-urban Paris. Measurements of primary and secondary volatile organic compounds (VOCs), of both anthropogenic and biogenic origins, including for the first time C12-C16 n-alkanes of intermediate volatility (IVOCs), suspected to be efficient precursors of secondary organic aerosol (SOA). The time series of gaseous carbon are generally consistent with times series of particulate organic carbon at regional scales and
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9

McKinney, K. A., B. H. Lee, A. Vasta, T. V. Pho, and J. W. Munger. "Emissions of isoprenoids and oxygenated biogenic volatile organic compounds from a New England mixed forest." Atmospheric Chemistry and Physics Discussions 10, no. 11 (2010): 28565–633. http://dx.doi.org/10.5194/acpd-10-28565-2010.

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Abstract. Fluxes of biogenic volatile organic compounds, including isoprene, monoterpenes, and oxygenated VOCs measured above a mixed forest canopy in western Massachusetts during the 2005 and 2007 growing seasons are reported. Measurements were made using proton transfer reaction mass spectrometry (PTR-MS) and converted to fluxes using the disjunct eddy covariance technique. Isoprene was by far the predominant BVOC emitted at this site, with summer mid-day average fluxes of 5.3 and 4.4 mg m−2 h−1 in 2005 and 2007, respectively. In comparison, mid-day average fluxes of monoterpenes were 0.21 a
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McKinney, K. A., B. H. Lee, A. Vasta, T. V. Pho, and J. W. Munger. "Emissions of isoprenoids and oxygenated biogenic volatile organic compounds from a New England mixed forest." Atmospheric Chemistry and Physics 11, no. 10 (2011): 4807–31. http://dx.doi.org/10.5194/acp-11-4807-2011.

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Abstract. Fluxes of biogenic volatile organic compounds, including isoprene, monoterpenes, and oxygenated VOCs measured above a mixed forest canopy in central Massachusetts during the 2005 and 2007 growing seasons are reported. Mixing ratios were measured using proton transfer reaction mass spectrometry (PTR-MS) and fluxes computed by the disjunct eddy covariance technique. Isoprene was by far the predominant BVOC emitted at this site, with summer mid-day average fluxes of 5.3 and 4.4 mg m−2 hr−1 in 2005 and 2007, respectively. In comparison, mid-day average fluxes of monoterpenes were 0.21 an
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11

Ait-Helal, W., A. Borbon, S. Sauvage, et al. "Volatile and intermediate volatility organic compounds in suburban Paris: variability, origin and importance for SOA formation." Atmospheric Chemistry and Physics 14, no. 19 (2014): 10439–64. http://dx.doi.org/10.5194/acp-14-10439-2014.

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Abstract. Measurements of gaseous and particulate organic carbon were performed during the MEGAPOLI experiments, in July 2009 and January–February 2010, at the SIRTA observatory in suburban Paris. Measurements comprise primary and secondary volatile organic compounds (VOCs), of both anthropogenic and biogenic origins, including C12–C16 n-alkanes of intermediate volatility (IVOCs), suspected to be efficient precursors of secondary organic aerosol (SOA). The time series of gaseous carbon are generally consistent with times series of particulate organic carbon at regional scale, and are clearly a
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12

Seco, R., J. Peñuelas, I. Filella, et al. "Volatile organic compounds in the western Mediterranean basin: urban and rural winter measurements during the DAURE campaign." Atmospheric Chemistry and Physics 13, no. 8 (2013): 4291–306. http://dx.doi.org/10.5194/acp-13-4291-2013.

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Abstract. Atmospheric volatile organic compounds (VOCs) have key environmental and biological roles, but little is known about the daily VOC mixing ratios in Mediterranean urban and natural environments. We measured VOC mixing ratios concurrently at an urban and a rural site during the winter DAURE campaign in the northeastern Iberian Peninsula, by means of PTR-MS at both locations: a PTR-Quad-MS at the urban site and a PTR-ToF-MS at the rural site. All VOC mixing ratios measured were higher at the urban site (e.g. acetaldehyde, isoprene, benzene, and toluene with averages up to 1.68, 0.31, 0.
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13

Jones, C. E., J. R. Hopkins, and A. C. Lewis. "In situ measurements of isoprene and monoterpenes within a South-East Asian tropical rainforest." Atmospheric Chemistry and Physics Discussions 11, no. 1 (2011): 1189–218. http://dx.doi.org/10.5194/acpd-11-1189-2011.

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Abstract. Biogenic volatile organic compounds (BVOCs) emitted from tropical rainforests comprise a substantial fraction of global atmospheric VOC emissions, however there are only relatively limited measurements of these species in tropical rainforest regions. We present observations of isoprene, α-pinene, camphene, Δ-3-carene, γ-terpinene and limonene, and oxygenated VOCs (OVOCs) of biogenic origin such as methacrolein, in ambient air above a~tropical rainforest in Malaysian Borneo. Daytime composition was dominated by isoprene, with an average mixing ratio of the order of ~1 ppb. γ-terpinene
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14

Whalley, L. K., D. Stone, B. Bandy, et al. "Atmospheric OH reactivity in central London: observations, model predictions and estimates of in situ ozone production." Atmospheric Chemistry and Physics Discussions 15, no. 21 (2015): 31247–86. http://dx.doi.org/10.5194/acpd-15-31247-2015.

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Abstract. Near-continuous measurements of OH reactivity in the urban background atmosphere of central London during the summer of 2012 are presented. OH reactivity behaviour is seen to be broadly dependent on airmass origin with the highest reactivity and the most pronounced diurnal profile observed when air had passed over central London to the East, prior to measurement. Averaged over the entire observation period of 26 days, OH reactivity peaked at ~ 27 s−1 in the morning with a minimum of ~ 15 s−1 during the afternoon. A maximum OH reactivity of 116 s−1 was recorded on one day during morni
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15

Whalley, Lisa K., Daniel Stone, Brian Bandy, et al. "Atmospheric OH reactivity in central London: observations, model predictions and estimates of in situ ozone production." Atmospheric Chemistry and Physics 16, no. 4 (2016): 2109–22. http://dx.doi.org/10.5194/acp-16-2109-2016.

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Abstract. Near-continuous measurements of hydroxyl radical (OH) reactivity in the urban background atmosphere of central London during the summer of 2012 are presented. OH reactivity behaviour is seen to be broadly dependent on air mass origin, with the highest reactivity and the most pronounced diurnal profile observed when air had passed over central London to the east, prior to measurement. Averaged over the entire observation period of 26 days, OH reactivity peaked at ∼ 27 s−1 in the morning, with a minimum of ∼ 15 s−1 during the afternoon. A maximum OH reactivity of 116 s−1 was recorded o
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16

Jones, C. E., J. R. Hopkins, and A. C. Lewis. "In situ measurements of isoprene and monoterpenes within a south-east Asian tropical rainforest." Atmospheric Chemistry and Physics 11, no. 14 (2011): 6971–84. http://dx.doi.org/10.5194/acp-11-6971-2011.

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Abstract. Biogenic volatile organic compounds (BVOCs) emitted from tropical rainforests comprise a substantial fraction of global atmospheric VOC emissions, however there are only relatively limited measurements of these species in tropical rainforest regions. We present observations of isoprene, α-pinene, camphene, Δ-3-carene, γ-terpinene and limonene, as well as oxygenated VOCs (OVOCs) of biogenic origin such as methacrolein, in ambient air above a tropical rainforest in Malaysian Borneo during the Oxidant and Particle Photochemical Processes above a south-east Asian tropical rainforest (OP3
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17

Debevec, Cécile, Stéphane Sauvage, Valérie Gros, et al. "Seasonal variation and origins of volatile organic compounds observed during 2 years at a western Mediterranean remote background site (Ersa, Cape Corsica)." Atmospheric Chemistry and Physics 21, no. 3 (2021): 1449–84. http://dx.doi.org/10.5194/acp-21-1449-2021.

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Abstract. An original time series of about 300 atmospheric measurements of a wide range of volatile organic compounds (VOCs) was obtained at a remote Mediterranean station on the northern tip of Corsica (Ersa, France) over 25 months from June 2012 to June 2014. This study presents the seasonal variabilities of 35 selected VOCs and their various associated sources. The VOC abundance was largely dominated by oxygenated VOCs (OVOCs) along with primary anthropogenic VOCs with a long lifetime in the atmosphere. VOC temporal variations were then examined. Primarily of local origin, biogenic VOCs exh
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18

Seco, R., J. Peñuelas, I. Filella, et al. "Contrasting winter and summer VOC mixing ratios at a forest site in the Western Mediterranean Basin: the effect of local biogenic emissions." Atmospheric Chemistry and Physics Discussions 11, no. 7 (2011): 20389–431. http://dx.doi.org/10.5194/acpd-11-20389-2011.

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Abstract. Atmospheric volatile organic compounds (VOCs) are involved in ozone and aerosol generation, thus having implications for air quality and climate. VOCs and their emissions by vegetation also have important ecological roles as they can protect plants from stresses and act as communication cues between plants and between plants and animals. In spite of these key environmental and biological roles, the reports on seasonal and daily VOC mixing ratios in the literature for Mediterranean natural environments are scarce. We conducted seasonal (winter and summer) measurements of VOC mixing ra
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Seco, R., J. Peñuelas, I. Filella, et al. "Contrasting winter and summer VOC mixing ratios at a forest site in the Western Mediterranean Basin: the effect of local biogenic emissions." Atmospheric Chemistry and Physics 11, no. 24 (2011): 13161–79. http://dx.doi.org/10.5194/acp-11-13161-2011.

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Abstract. Atmospheric volatile organic compounds (VOCs) are involved in ozone and aerosol generation, thus having implications for air quality and climate. VOCs and their emissions by vegetation also have important ecological roles as they can protect plants from stresses and act as communication cues between plants and between plants and animals. In spite of these key environmental and biological roles, the reports on seasonal and daily VOC mixing ratios in the literature for Mediterranean natural environments are scarce. We conducted seasonal (winter and summer) measurements of VOC mixing ra
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20

Bourtsoukidis, E., J. Williams, J. Kesselmeier, S. Jacobi, and B. Bonn. "From emissions to ambient mixing ratios: online seasonal field measurements of volatile organic compounds over a Norway spruce-dominated forest in central Germany." Atmospheric Chemistry and Physics 14, no. 13 (2014): 6495–510. http://dx.doi.org/10.5194/acp-14-6495-2014.

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Abstract. Biogenic volatile organic compounds (BVOCs) are substantial contributors to atmospheric chemistry and physics and demonstrate the close relationship between biosphere and atmosphere. Their emission rates are highly sensitive to meteorological and environmental changes with concomitant impacts on atmospheric chemistry. We have investigated seasonal isoprenoid and oxygenated VOC (oxVOC) fluxes from a Norway spruce (Picea abies) tree in central Germany and explored the emission responses under various atmospheric conditions. Emission rates were quantified by using dynamic branch enclosu
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21

Dominutti, Pamela A., Pascal Renard, Mickaël Vaïtilingom, et al. "Insights into tropical cloud chemistry in Réunion (Indian Ocean): results from the BIO-MAÏDO campaign." Atmospheric Chemistry and Physics 22, no. 1 (2022): 505–33. http://dx.doi.org/10.5194/acp-22-505-2022.

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Abstract. We present here the results obtained during an intensive field campaign conducted in the framework of the French “BIO-MAÏDO” (Bio-physico-chemistry of tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols' formation) project. This study integrates an exhaustive chemical and microphysical characterization of cloud water obtained in March–April 2019 in Réunion (Indian Ocean). Fourteen cloud samples have been collected along the slope of this mountainous island. Comprehensive chemical characterization of these samples is performed, including inor
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22

Kumar, Varun, Stamatios Giannoukos, Sophie L. Haslett, et al. "Highly time-resolved chemical speciation and source apportionment of organic aerosol components in Delhi, India, using extractive electrospray ionization mass spectrometry." Atmospheric Chemistry and Physics 22, no. 11 (2022): 7739–61. http://dx.doi.org/10.5194/acp-22-7739-2022.

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Abstract. In recent years, the Indian capital city of Delhi has been impacted by very high levels of air pollution, especially during winter. Comprehensive knowledge of the composition and sources of the organic aerosol (OA), which constitutes a substantial fraction of total particulate mass (PM) in Delhi, is central to formulating effective public health policies. Previous source apportionment studies in Delhi identified key sources of primary OA (POA) and showed that secondary OA (SOA) played a major role but were unable to resolve specific SOA sources. We address the latter through the firs
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23

Bourtsoukidis, E., J. Williams, J. Kesselmeier, S. Jacobi, and B. Bonn. "From emissions to ambient mixing ratios: on-line seasonal field measurements of volatile organic compounds over a Norway spruce dominated forest in central Germany." Atmospheric Chemistry and Physics Discussions 13, no. 11 (2013): 30187–232. http://dx.doi.org/10.5194/acpd-13-30187-2013.

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Abstract. Biogenic volatile organic compounds (BVOC) are substantial contributors to atmospheric chemistry and physics and demonstrate the close relationship between biosphere and atmosphere. Their emission rates are highly sensitive to meteorological and environmental changes with concomitant impacts on atmospheric chemistry. We have investigated seasonal isoprenoid and oxygenated VOC (oxVOC) fluxes from a Norway spruce (Picea abies) tree in Central Germany and explored the emission responses under various atmospheric conditions. Emission rates were quantified by using dynamic branch enclosur
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24

Baudic, Alexia, Valérie Gros, Stéphane Sauvage, et al. "Seasonal variability and source apportionment of volatile organic compounds (VOCs) in the Paris megacity (France)." Atmospheric Chemistry and Physics 16, no. 18 (2016): 11961–89. http://dx.doi.org/10.5194/acp-16-11961-2016.

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Abstract. Within the framework of air quality studies at the megacity scale, highly time-resolved volatile organic compound (C2–C8) measurements were performed in downtown Paris (urban background sites) from January to November 2010. This unique dataset included non-methane hydrocarbons (NMHCs) and aromatic/oxygenated species (OVOCs) measured by a GC-FID (gas chromatograph with a flame ionization detector) and a PTR-MS (proton transfer reaction – mass spectrometer), respectively. This study presents the seasonal variability of atmospheric VOCs being monitored in the French megacity and their v
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Hu, Di, and Jian Zhen Yu. "Secondary organic aerosol tracers and malic acid in Hong Kong: seasonal trends and origins." Environmental Chemistry 10, no. 5 (2013): 381. http://dx.doi.org/10.1071/en13104.

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Environmental context Secondary organic aerosols (SOAs), a major organic component of ambient fine particles, contribute to adverse health effects and visibility degradation. Quantification of SOA tracers allows estimation of contributions from specific precursors, which helps the formulation of effective control strategies. We found that malic acid was present in SOA at high abundance in both winter and summer; its seasonally distinct inter-species relationships offer insights into distinct SOA formation pathways. Abstract Fine particle samples collected at an urban location in Hong Kong duri
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Hamilton, J. F., M. R. Alfarra, N. Robinson, et al. "Linking biogenic hydrocarbons to biogenic aerosol in the Borneo rainforest." Atmospheric Chemistry and Physics 13, no. 22 (2013): 11295–305. http://dx.doi.org/10.5194/acp-13-11295-2013.

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Abstract. Emissions of biogenic volatile organic compounds are though to contribute significantly to secondary organic aerosol formation in the tropics, but understanding these transformation processes has proved difficult, due to the complexity of the chemistry involved and very low concentrations. Aerosols from above a Southeast Asian tropical rainforest in Borneo were characterised using liquid chromatography–ion trap mass spectrometry, high-resolution aerosol mass spectrometry and Fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) techniques. Oxygenated compounds were id
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Hamilton, J. F., M. R. Alfarra, N. Robinson, et al. "Linking biogenic hydrocarbons to biogenic aerosol in the Borneo rainforest." Atmospheric Chemistry and Physics Discussions 13, no. 7 (2013): 18113–41. http://dx.doi.org/10.5194/acpd-13-18113-2013.

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Abstract. Emissions of biogenic volatile organic compounds are though to contribute significantly to secondary organic aerosol formation in the tropics, but understanding the process of these transformations has proved difficult, due to the complexity of the chemistry involved and very low concentrations. Aerosols from above a South East Asian tropical rainforest in Borneo were characterised using liquid chromatography-ion trap mass spectrometry, high resolution aerosol mass spectrometry and fourier transform ion cyclotron resonance mass spectrometry (FTICRMS) techniques. Oxygenated compounds
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El Haddad, I., B. D'Anna, B. Temime-Roussel та ін. "On the chemical nature of the oxygenated organic aerosol: implication in the formation and aging of α-pinene SOA in a Mediterranean environment, Marseille". Atmospheric Chemistry and Physics Discussions 12, № 8 (2012): 19769–97. http://dx.doi.org/10.5194/acpd-12-19769-2012.

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Abstract. Organic Aerosol (OA) measurements were conducted during summer 2008 at an urban background site, in Marseille, France's second city and the largest port in the Mediterranean, an urban industrialized environment known for its active photochemistry. PM2.5 was collected using high volume samplers and analyzed for elemental and organic carbon, major ions (NH4+, NO3− and SO42−), humic-like-substances, organic markers (i.e. primary tracers and α-pinene oxidation products), elemental composition and radiocarbon content (14C). The real-time chemical characterization of submicron particles wa
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Shen, Xiaoli, Heike Vogel, Bernhard Vogel, et al. "Composition and origin of PM<sub>2.5</sub> aerosol particles in the upper Rhine valley in summer." Atmospheric Chemistry and Physics 19, no. 20 (2019): 13189–208. http://dx.doi.org/10.5194/acp-19-13189-2019.

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Abstract. We conducted a 6-week measurement campaign in summer 2016 at a rural site about 11 km north of the city of Karlsruhe in southwest Germany in order to study the chemical composition and origin of aerosols in the upper Rhine valley. In particular, we deployed a single-particle mass spectrometer (LAAPTOF) and an aerosol mass spectrometer (AMS) to provide complementary chemical information on aerosol particles smaller than 2.5 µm. For the entire measurement period, the total aerosol particle mass was dominated by sodium salts, contributing on average (36±27) % to the total single particl
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