Chemical composition of urban aerosols in Toulouse, France during CAPITOUL experiment

Calvo, Ana; Pont, Véronique; Liousse, Catherine; Dupré, Bernard; Mariscal, A.; Zouiten, Cyril; Gardrat, Eric; Castéra, Pierre; Lacaux, C. Galy; Castro, Amaya; Fraile, Roberto

doi:10.1007/s00703-008-0319-2

Cited by 28 publications

(8 citation statements)

References 92 publications

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“…It is apparent that the polarities of the degradation products are remarkably larger than that of p-xylene, which is also consistent with their relative hygroscopic values (water solubilities for p-xylene and p-tolualdehyde are 0.2 and 3 g/L, respectively) [44], and somewhat predict the massive contributions of p-xylene degradation products to the formation of SOAs. This result is consistent with a previous experimental result in which higher ratio of secondary VOC in SOAs in summer than in other seasons was observed [45].…”

Section: Environmental Significancesupporting

confidence: 94%

Theoretical considerations of secondary organic aerosol formation from H-abstraction of p-xylene

et al. 2011

Computational and Theoretical Chemistry

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Section: Environmental Significancesupporting

confidence: 94%

Theoretical considerations of secondary organic aerosol formation from H-abstraction of p-xylene

et al. 2011

Computational and Theoretical Chemistry

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“…This behaviour was not observed everywhere in mixing layer stations. In some places, a maximum was observed during winter and a minimum during summer, presumably due to a larger impact of combustion sources during winter and the "trapping" of these particles in a thinner mixed layer (Mészáros et al 1997;Röösli et al 2001;Calvo et al 2008;Vecchi et al 2009). At high altitude stations such as the Jungfraujoch (3,454 ma.s.l.…”

Section: Time Variation Of the Weighed Massmentioning

confidence: 96%

Seasonal variation of water-soluble inorganic components in aerosol size-segregated at the puy de Dôme station (1,465 m a.s.l.), France

et al. 2012

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The size-segregated chemical composition of aerosol particles was investigated during 1 year at the puy de Dôme (1,465 ma.s.l.), France. These measurements aimed to a better understanding of the influence of the air mass origin on the size-segregated chemical composition of the aerosol at an altitude site. Mountain site measurements are important because they are representative of long range transport and useful for model validation. PM 1 mass concentration exhibits a seasonal variability with a summer maximum. The composition of PM 1 did not change significantly in terms of relative contribution of water soluble inorganic ions but is rather variable in term of total mass concentrations. For the PM 10-1 , a different seasonal behaviour was found with maxima concentrations in autumn-winter. Aerosols were classified into four different categories according to their air mass origin: marine, marine modified, continental and Mediterranean. The PM 10 aerosol mass at 50 % relative humidity was close to 2.5 μg m −3 in the marine, 4.3 μg m −3 in the marine modified, 10.3 μg m −3 in the continental and 7.7 μg m −3 in the Mediterranean sectors. We noted that the influence of the air mass origin (on the chemical properties) could be seen especially on the PM 10-1 . A significant PM 10-1 mode was found in marine, modified marine, and J Atmos Chem (2012) 69:47-66 Mediterranean air masses, and PM 1 dominated in the continental air masses samples. As a result, the aerosol chemical composition variability at the puy de Dôme is a function of both the season and air mass type and we provide a chemical composition of the aerosol as a function of each of these environmental factors.

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“…High SOC contributions are typically observed in Southern European cities, favored by the warm climate and the strong insolation, which promote photo-oxidation processes. Using the (OC/EC) min approach, SOC/OC ratios of 42% in Oporto [52] and 47% in Toulouse [86] have been reported. Galindo et al [87] found annual-mean contributions (38%) of SOC to OC for PM 10 samples in urban Elche, Spain, whereas a 50% SOC fraction to OC mass of PM 2.5 and PM 10 samples was found in Lecce, Italy [88].…”

Section: Determination Of Primary and Secondary Organic Carbonmentioning

confidence: 99%

Carbonaceous Aerosols in Contrasting Atmospheric Environments in Greek Cities: Evaluation of the EC-tracer Methods for Secondary Organic Carbon Estimation

et al. 2020

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This study examines the carbonaceous-aerosol characteristics at three contrasting urban environments in Greece (Ioannina, Athens, and Heraklion), on the basis of 12 h sampling during winter (January to February 2013), aiming to explore the inter-site differences in atmospheric composition and carbonaceous-aerosol characteristics and sources. The winter-average organic carbon (OC) and elemental carbon (EC) concentrations in Ioannina were found to be 28.50 and 4.33 µg m−3, respectively, much higher than those in Heraklion (3.86 µg m−3 for OC and 2.29 µg m−3 for EC) and Athens (7.63 µg m−3 for OC and 2.44 µg m−3 for EC). The winter OC/EC ratio in Ioannina (6.53) was found to be almost three times that in Heraklion (2.03), indicating a larger impact of wood combustion, especially during the night, whereas in Heraklion, emissions from biomass burning were found to be less intense. Estimations of primary and secondary organic carbon (POC and SOC) using the EC-tracer method, and specifically its minimum R-squared (MRS) variant, revealed large differences between the sites, with a prevalence of POC (67–80%) in Ioannina and Athens and with a larger SOC fraction (53%) in Heraklion. SOC estimates were also obtained using the 5% and 25% percentiles of the OC/EC data to determine the (OC/EC)pri, leading to results contrasting to the MRS approach in Ioannina (70–74% for SOC). Although the MRS method provides generally more robust results, it may significantly underestimate SOC levels in environments highly burdened by biomass burning, as the fast-oxidized semi-volatile OC associated with combustion sources is classified in POC. Further analysis in Athens revealed that the difference in SOC estimates between the 5% percentile and MRS methods coincided with the semi-volatile oxygenated organic aerosol as quantified by aerosol mass spectrometry. Finally, the OC/Kbb+ ratio was used as tracer for decomposition of the POC into fossil-fuel and biomass-burning components, indicating the prevalence of biomass-burning POC, especially in Ioannina (77%).

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Chemical composition of urban aerosols in Toulouse, France during CAPITOUL experiment

Cited by 28 publications

References 92 publications

Theoretical considerations of secondary organic aerosol formation from H-abstraction of p-xylene

Theoretical considerations of secondary organic aerosol formation from H-abstraction of p-xylene

Seasonal variation of water-soluble inorganic components in aerosol size-segregated at the puy de Dôme station (1,465 m a.s.l.), France

Carbonaceous Aerosols in Contrasting Atmospheric Environments in Greek Cities: Evaluation of the EC-tracer Methods for Secondary Organic Carbon Estimation

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