Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Laboratory study of the migration of methane sulphonate in firn
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 GLACIOLOGY
fascicolo: 150, volume: 45, anno: 1999,
pagine: 214 - 218
SICI:
0022-1430(1999)45:150<214:LSOTMO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
ICE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Pasteur, EC British Antarctic Survey, NERC, High Cross, Cambridge CB3 0ET,England British Antarctic Survey High Cross Cambridge England CB3 0ET
Citazione:
E.C. Pasteur e R. Mulvaney, "Laboratory study of the migration of methane sulphonate in firn", J GLACIOL, 45(150), 1999, pp. 214-218

Abstract

Two 10 cm lengths of firn core from the Dyer Plateau (70 degrees 31'S, 65 degrees 01'W), Antarctic Peninsula, were used to carry out a laboratory experiment to investigate the migration of methane sulphonate, the anion of methane sulphonic acid (MSA), in natural firn. Each length was cut verticallyinto four pieces, and a dopant solution containing Cl-, NO3-, SO42- F- andMSA(-) pipetted onto the top of three sections, the fourth being kept as ablank. The doped sections were stored vertically, with the doped end uppermost, for 8 months at a range of temperatures (nominally -5 degrees, -10 degrees and -22 degrees C) before subsampling at 1 cm resolution and analysisby ion chromatography. The two firn lengths were treated identically and the results were consistent. Profiles of the doped firn sections showed thatCl-, NO3- and SO42- remained in the uppermost subsample, although the NO3-concentrations were variable compared to the blank. The F- profile shows slightly elevated concentrations in the second sample down compared to the blank, at: temperatures of-10 degrees C and above. The IL MSA(-) showed higher concentrations in the second, third and fourth samples down at -10 degrees C and above, which indicates that some percolated downwards from its original position at the top of the core. This experiment shows that MSA(-) ismobile in warm firn even over a short period of time. We propose that the mechanism for the mobility of MSA(-) in natural firn is via liquid MSA drainage, though we cannot yet discount vapour phase transport.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 17:54:49