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TitreTransport of suspended particulate matter in an Antarctic fjord
AuteurDomack, E W; Foss, D J P; Syvitski, J P M; McClennen, C E
SourceMarine Geology vol. 121, issue 3-4, 1994 p. 161-170,
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 12593
ÉditeurElsevier BV
Documentpublication en série
Mediapapier; en ligne; numérique
Lat/Long OENS -61.3333 -61.0000 -64.2500 -64.3333
Sujetstempérature de l'eau; salinité; transport des sediments; sables; quartz; analyse granulométriques; silts; sédiments de fond; courants de turbidite; turbidite
Illustrationslocation maps; graphs; photomicrographs; schematic cross-sections
Résumé(disponible en anglais seulement)
Vertical profiles of temperature, salinity, and light attenuation were used in conjunction with underwater photography and water samples to characterize the nature and dynamics of particle transport in an Antarctic fjord. Most of the particles are sand sized (0.1-2 mm) floccules comprised of individual grains in the 5 to 50 pm size range. The quartz silt grains are derived from basal, debris laden meltwater originating from beneath the submerged valley glacier. The meltwater buoyantly rises to form cold water interflows at mid water depths. Turbulent mixing near the seafloor also plays a role in the transport and break-up of floccules. Together the midwater cold tongues and near-bottom turbidity account for 87% of the total sediment load thus attesting to the importance of non-surface transport mechanisms in
polar fjords.