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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2014

Contributo in rivista

Tipo: Articolo in rivista

Titolo: In situ physical and chemical characterisation of the Eyjafjallajökull aerosol plume in the free troposphere over Italy

Anno di pubblicazione: 2014

Formato: Cartaceo

Autori: Sandrini, S.a , Giulianelli, L.a, Decesari, S.a, Fuzzi, S.a, Cristofanelli, P.a, Marinoni, A.a, Bonasoni, P.a, Chiari, M.b, Calzolai, G.b, Canepari, S.c, Perrino, C.d, Facchini, M.C.a

Affiliazioni autori: a Institute of Atmospheric Sciences and Climate, National Research Council, Bologna, 40129, Italy b Italian National Institute for Nuclear Physics, Florence section, Sesto Fiorentino, 50019, Italy c University of Rome La Sapienza, Chemistry Department, Rome, 00185, Italy d C.N.R. Institute of Atmospheric Pollution, Monterotondo St., Rome, 00015, Italy

Autori CNR:

  • PAOLO BONASONI
  • PAOLO CRISTOFANELLI
  • STEFANO DECESARI
  • MARIA CRISTINA FACCHINI
  • SANDRO FUZZI
  • LARA GIULIANELLI
  • ANGELA MARINONI
  • CINZIA PERRINO
  • SILVIA SANDRINI

Abstract: Continuous measurements of physical and chemical properties at the Mt. Cimone (Italy) GAW-WMO (Global Atmosphere Watch, World Meteorological Organization) Global Station (2165 m a.s.l.) have allowed the detection of the volcanic aerosol plume resulting from the Eyjafjallajökull (Iceland) eruption of spring 2010. The event affected the Mt. Cimone site after a transport over a distance of more than 3000 km. Two main transport episodes were detected during the eruption period, showing a volcanic fingerprint discernible against the free tropospheric background conditions typical of the site, the first from April 19 to 21 and the second from 18 to 20 May 2010. This paper reports the modification of aerosol characteristics observed during the two episodes, both characterised by an abrupt increase in fine and, especially, coarse mode particle number.

Analysis of major, minor and trace elements by different analytical techniques (ionic chromatography, particle induced X-ray emission-particle induced gamma-ray emission (PIXE-PIGE) and inductively coupled plasma mass spectrometry (ICP-MS)) were performed on aerosols collected by ground-level discrete sampling. The resulting database allows the characterisation of aerosol chemical composition during the volcanic plume transport and in background conditions. During the passage of the volcanic plume, the fine fraction was dominated by sulphates, denoting the secondary origin of this mode, mainly resulting from in-plume oxidation of volcanic SO2. By contrast, the coarse fraction was characterised by increased concentration of numerous elements of crustal origin, such as Fe, Ti, Mn, Ca, Na, and Mg, which enter the composition of silicate minerals. Data analysis of selected elements (Ti, Al, Fe, Mn) allowed the estimation of the volcanic plume's contribution to total PM10, resulting in a local enhancement of up to 9.5 ?g m-3, i.e. 40% of total PM10 on 18 May, which was the most intense of the two episodes. These results appear significant, especially in light of the huge distance of Mt. Cimone from the source, confirming the widespread diffusion of the Eyjafjallajökull ashes over Europe. © Author(s) 2014.

Pagine da: 1075

Pagine a: 1092

Rivista:

Atmospheric chemistry and physics Copernicus Publ.
Paese di pubblicazione: Germania
Lingua: inglese
ISSN: 1680-7316

Numero volume: 14

Numero fascicolo: 2

DOI: 10.5194/acp-14-1075-2014

Referee: Sì: Internazionale

Indicizzato da: Scopus [84893342859]

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