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Titolo:
Migration of methane sulphonate in Antarctic firn and ice
Autore:
Pasteur, EC; Mulvaney, R;
Indirizzi:
British Antarctic Survey, NERC, Cambridge CB3 0ET, England British Antarctic Survey Cambridge England CB3 0ET idge CB3 0ET, England
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D9, volume: 105, anno: 2000,
pagine: 11525 - 11534
Fonte:
ISI
Lingua:
ENG
Soggetto:
METHANESULFONIC-ACID; SULFUR; CORE; SNOW; CHEMISTRY; STATION; SULFATE; AEROSOL; ISLAND; DOME;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Pasteur, EC British Antarctic Survey, NERC, Madingley Rd, Cambridge CB3 0ET, England British Antarctic Survey Madingley Rd Cambridge England CB3 0ET
Citazione:
E.C. Pasteur e R. Mulvaney, "Migration of methane sulphonate in Antarctic firn and ice", J GEO RES-A, 105(D9), 2000, pp. 11525-11534

Abstract

We investigate the seasonal relationship of the sulphur-bearing anions methane sulphonate (MSA(-)) and non-sea-salt sulphate (nssSO(4)(2-)) in sections of firn and ice cores from the Antarctic Peninsula and Weddell Sea region of Antarctica. In cores from Dolleman Island and Berkner Island, MSA(-) has clearly migrated from the summer snow layer, where it is initially deposited, to become concentrated in the winter layer. A similar behavior is evident in a core from the Dyer Plateau, though in deeper layers. Cores from Gomez Nunatak and Beethoven Peninsula show little evidence of relocation of MSA(-), though migration at greater depth in the ice sheet cannot be ruled out. In contrast, in all these cores, non-sea-salt sulphate remains in the summer layer. From comparisons between the ice core characteristics and themigration behavior at these sites, we conclude that the movement of MSA(-)does not occur via percolation and refreezing of meltwater. Simple concentration-driven diffusion is also not a factor, as the MSA(-) peaks are sharpin the winter layer. The data presented indicate that the movement of MSA(-) in firn is likely to be linked to the concentration of other ionic species in the snowpack and to the snow accumulation rate. A possible mechanism for the migration of MSA(-) in the snowpack is via an initial diffusion in the liquid or vapor phase, which is halted by trapping in the winter layer when the MSA(-) forms a salt with a cation.

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Documento generato il 06/07/20 alle ore 08:50:51