Physicochemical characteristics of aerosols measured in the spring time in the Mediterranean coastal zone

Piazzola, Jacques; Sellegri, Karine; Bourcier, L.; Mallet, Marc; Tedeschi, Gilles; Missamou, Tathy

doi:10.1016/j.atmosenv.2012.02.057

Cited by 33 publications

(30 citation statements)

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“…The analysis of the complex refractive index suggests that possible differences in terms of particle composition can explain in part the observed variability of ω. A large range of compositions has been however reported for pollution aerosols in Europe and the Mediterranean basin (Mallet et al, 2003;Ebert et al, 2004;Pey et al, 2010;Piazzola et al, 2012) and a more detailed analysis of the aerosol composition for the cases measured here should be addressed.…”

Section: Discussionmentioning

confidence: 99%

“…In spite of this, the characterization of the optical properties of anthropogenic aerosols in this part of the basin remains only limited to coastal and inland regions (Mallet et al, 2003(Mallet et al, , 2011(Mallet et al, , 2013Lyamani et al, 2006;Estelles et al, 2007;Saha et al, 2008;Esteve et al, 2012;Piazzola et al, 2012;Pandolfi et al, 2011Pandolfi et al, , 2014, or remote islands actually far from the strong influence of continental outflows (Lyamani et al, 2015). Moreover, the majority of these studies uses remote-sensing measurements and analyse aerosol properties integrated over the entire atmospheric column, without information on their vertical variability.…”

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confidence: 99%

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Continental pollution in the Western Mediterranean basin: large variability of the aerosol single scattering albedo and influence on the direct shortwave radiative effect

et al. 2016

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Abstract. Pollution aerosols strongly influence the composition of the Western Mediterranean basin, but at present little is known on their optical properties. We report in this study in situ observations of the single scattering albedo (ω) of pollution aerosol plumes measured over the Western Mediterranean basin during the TRAQA (TRansport and Air QuAlity) airborne campaign in summer 2012. Cases of pollution export from different source regions around the basin and at different altitudes between ∼ 160 and 3500 m above sea level were sampled during the flights. Data from this study show a large variability of ω, with values between 0.84-0.98 at 370 nm and 0.70-0.99 at 950 nm. The single scattering albedo generally decreases with the wavelength, with some exception associated to the mixing of pollution with sea spray or dust particles over the sea surface. The lowest values of ω (0.84-0.70 between 370 and 950 nm) are measured in correspondence of a fresh plume possibly linked to ship emissions over the basin. The range of variability of ω observed in this study seems to be independent of the source region around the basin, as well as of the altitude and aging time of the plumes. The observed variability of ω reflects in a large variability for the complex refractive index of pollution aerosols, which is estimated to span in the large range 1.41-1.77 and 0.002-0.097 for the real and the imaginary parts, respectively, between 370 and 950 nm.Radiative calculations in clear-sky conditions were performed with the GAME radiative transfer model to test the sensitivity of the aerosol shortwave Direct Radiative Effect (DRE) to the variability of ω as observed in this study. Results from the calculations suggest up to a 50 and 30 % change of the forcing efficiency (FE), i.e. the DRE per unit of optical depth, at the surface (−160/−235 W m −2 τ −1 at 60 • solar zenith angle) and at the Top-Of-Atmosphere (−137/−92 W m −2 τ −1 ) for ω varying between its maximum and minimum value. This induces a change of up to an order of magnitude (+23/+143 W m −2 τ −1 ) for the radiative effect within the atmosphere.

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Section: Discussionmentioning

confidence: 99%

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Continental pollution in the Western Mediterranean basin: large variability of the aerosol single scattering albedo and influence on the direct shortwave radiative effect

et al. 2016

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“…Turpin and Lim (2001) Pateraki et al (2012) 12 Terzi et al (2010) 13 Bougiatioti et al (2013) 14 Koulouri et al (2008) 15 16 Kopanakis et al (2012) 17 Piazzola et al (2012) 18 Pey et al (2009a) 19 Pey et al (2009b) suggest the use of different conversion factors according to site type: 1.6 ± 0.2 for urban areas, 1.9-2.3 for aged aerosols and 2.2-2.6 for biomass burning. Taking into account that our site is an urban background station which is also affected by long-range transport (e.g., Sciare et al, 2005;Kanakidou et al, 2011;Pateraki et al, 2012;Remoundaki et al, 2013), we used the value of 2.1 (OM = 2.1 · OC).…”

Section: Mass Concentrations Of Oc-ec and Observed Seasonal Trendsmentioning

confidence: 99%

Long-term characterization of organic and elemental carbon in the PM<sub>2.5</sub> fraction: the case of Athens, Greece

et al. 2014

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Abstract. Organic carbon (OC), elemental carbon (EC), water-soluble organic carbon (WSOC) and main ions were measured in a total of 1510 PM 2.5 daily aerosol samples collected from May 2008 to April 2013 in Athens, Greece. OC and EC concentrations were 2.1 ± 1.3 µg m −3 and 0.54 ± 0.39 µg m −3 , accounting for 11 ± 3 % and 3 ± 1 % of PM 2.5 mass, respectively, with an average OC / EC ratio of 4.7 ± 3.1. Significant correlation was found between OC and EC during the whole period, indicating emissions by common primary sources on a regional scale. WSOC concentration ranged from 0.03 to 10.6 µg m −3 , with an average of 1.5 ± 0.9 µg m −3 . By considering the Finokalia (Crete) station as a reference, it was estimated that, during the warm season in Athens, 67 ± 7 % of emitted OC and 53 ± 12 % of emitted EC is regional, while, during cold months, the regional contribution of OC is only 33 ± 7 % and of EC 29 ± 8 %. Furthermore, secondary organic carbon (SOC) was calculated for the warm period of the year (April to October). The estimated SOC constituted about 75 ± 6 % of PM 2.5 organic carbon in Athens, highlighting significant aging processes on a regional scale. In the period 2011-2013 and during wintertime, an increase in OC and EC levels was observed, attributed to an increase in wood burning for domestic heating due to the economic crisis.

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“…Ils sont donc principalement constitués de chlorure de sodium (NaCl) mais la présence d'autres ions chimiques qui se trouvent dans l'eau de mer (sulfate, potassium, calcium, magnésium, ...) est également observée (Piazzola et al, 2012). De la matière organique a également été identifiée dans les aérosols marins mais le manque de mesures rend l'estimation de sa contribution à l'aérosol marin délicate (O'Dowd and de Leeuw, 2007 ;Piazzola et al, 2012). Des études réalisées en Atlantique Nord montrent une forte variation saisonnière des propriétés chimiques de l'aérosol marin en lien avec l'activité biologique : la contribution de la matière organique à la masse de l'aérosol marin est plus importante durant les périodes de floraison du phytoplancton .…”

Section: = ) 2(%)%") #(!$)unclassified

Regional Modeling of Aerosol Chemical Composition at the Puy de Dôme (France)

Barbet

Deguillaume

Chaumerliac

et al. 2016

Springer Proceedings in Complexity

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RemerciementsCes années de thèse se sont déroulées au sein du Laboratoire de Météorologie Physique dont le directeur était Wolfram Wobrock, puis Joël Van Baelen. Je tiens tout d'abord à les remercier tous deux de m'avoir accueillie au sein de ce laboratoire et ce depuis ma première année de Master.Je souhaite remercier sincèrement mes deux directeurs de thèse, Nadine Chaumerliac et Laurent Deguillaume qui, tout au long de ces années, m'ont suivie et encouragée. Les discussions que nous avons eues et les conseils qu'ils m'ont prodigués se sont toujours révélés fructueux et formateurs. Pour cela, je tiens à leur témoigner ma gratitude et mon respect.

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Physicochemical characteristics of aerosols measured in the spring time in the Mediterranean coastal zone

Cited by 33 publications

References 35 publications

Continental pollution in the Western Mediterranean basin: large variability of the aerosol single scattering albedo and influence on the direct shortwave radiative effect

Continental pollution in the Western Mediterranean basin: large variability of the aerosol single scattering albedo and influence on the direct shortwave radiative effect

Long-term characterization of organic and elemental carbon in the PM<sub>2.5</sub> fraction: the case of Athens, Greece

Regional Modeling of Aerosol Chemical Composition at the Puy de Dôme (France)

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Physicochemical characteristics of aerosols measured in the spring time in the Mediterranean coastal zone

Cited by 33 publications

References 35 publications

Continental pollution in the Western Mediterranean basin: large variability of the aerosol single scattering albedo and influence on the direct shortwave radiative effect

Continental pollution in the Western Mediterranean basin: large variability of the aerosol single scattering albedo and influence on the direct shortwave radiative effect

Long-term characterization of organic and elemental carbon in the PM&lt;sub&gt;2.5&lt;/sub&gt; fraction: the case of Athens, Greece

Regional Modeling of Aerosol Chemical Composition at the Puy de Dôme (France)

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Long-term characterization of organic and elemental carbon in the PM<sub>2.5</sub> fraction: the case of Athens, Greece