206
S. Tucci et al.
ed matter inside the DISW and the SISW and only partially to resuspension phenomena. If we consider data on the waters doser to the shelf break throughout the
column of water, there is a decrease in suspended matter, reaching 60% at 450 m.
There is also an increase of 8% at the bottom which may be due to resuspension
contribution [13, 14]. This contribution should be confirmed by higher size values, which are not présent in the intermediate waters.
In the external sector of the shelf, our results allowed us to hypothesize that the
40% of suspended matter lost in the subsuperficial waters is due to conveyance
westwards, connected with the movement of the Antarctic Circumpolar Water;
20% of the variation verified in the intermediate waters could be linked to the
flow of Warm Core waters towards the RIS.
These considérations and others formulated during the discussion place
emphasis on subhorizontal movements of the particle which occur in ail the mass
of water with variations interestingly up to the 60% of the total flux. These movements hâve been also indicated by a few authors in the Atlantic [15] and in
Mediterranean waters [16],
Acknowledgements. This study was performed as part of “National Programme
for Antarctic Research” and was fmancially supported by ENEA through a joint
research programme.
References
1. Dunbar RB, Anderson JB, Domack EW, Jacobs SS (1984) Océanographie influences on sédimentation along the Antarctic continental shelf. In: Jacobs SS (ed.) Oceanology of the Antarctic
Continental Shelf. Am Geophys Union, Washington, DC, pp 291-312
2. Anderson JB, Brake FC, Myers NC (1984) Sédimentation on the Ross Sea continental shelf,
Antarctica. Mar Geol 57:295-333
3. Accornero A, Bergamasco A, Monaco A, Tucci S (1998) Particle fluxes at the edge of the Ross Ice
Shelf: the rôle of physical forcing (This Vol.)
4. Strickland JDH, Parsons TR (1968) A practical handbook of seawater analysis. Bull Fish Res Board
of Canada 167:1-311
5. Pierce JW, Tucci S, Fierro G ( 1981 ) Assessing variation in suspensates, Ligurian Sea (northwestern
Mediterranean). Geo-Marine Letters 1:149-154
6. Krank K, Milligan T (1978) The use of the Coulter Counter in studies of particle size-distribution.
Aquatic Environment, Bedford Institute of Oceanography Dartmouth, Canada, Rep Ser BI-R-79-7,48
7. Jacobs SS, Fairbanks RJ, Horibe Y (1985) Origin and évolution of water masses near the Antarctic
Continental Margin: evidence from H2I8O/H216O ratio in seawater. In: Jacobs SS (ed) Oceanology
of the Antarctic Continental Shelf. Am Geophys Union, Washington, DC, pp 59-85
8. Budillon G, Conversano F, Giaquinto G, Morgigni M (1995) Idrologia del Mare di Ross. PNRA
Rapp Ant 95(02):428-435
9. Hayes DE, Davey FJ (1975) Geophysical study of the Ross Sea, Antarctica. Initial Rep DSDP, 28:887907
10. Vanney JR, Falconer RKH, Johnson GL (1981) Geomorphology of the Ross Sea and adjacent
oceanic provinces. Mar Geol 41:73-102
11. Carter L, Mitchell JS, Day NJ (1981) Suspended sédiment beneath permanent and seasonal ice,
Ross Ice Shelf, Antarctica. New Zealand, J Geol Geophy 50,24:249-262
12. Biscaye PE, Eittreim SL (1977) Suspended particulate loads and transports in the nepheloid layer
of the abyssal Atlantic Océan. Mar Geol 23:155-172
S. Tucci et al.
ed matter inside the DISW and the SISW and only partially to resuspension phenomena. If we consider data on the waters doser to the shelf break throughout the
column of water, there is a decrease in suspended matter, reaching 60% at 450 m.
There is also an increase of 8% at the bottom which may be due to resuspension
contribution [13, 14]. This contribution should be confirmed by higher size values, which are not présent in the intermediate waters.
In the external sector of the shelf, our results allowed us to hypothesize that the
40% of suspended matter lost in the subsuperficial waters is due to conveyance
westwards, connected with the movement of the Antarctic Circumpolar Water;
20% of the variation verified in the intermediate waters could be linked to the
flow of Warm Core waters towards the RIS.
These considérations and others formulated during the discussion place
emphasis on subhorizontal movements of the particle which occur in ail the mass
of water with variations interestingly up to the 60% of the total flux. These movements hâve been also indicated by a few authors in the Atlantic [15] and in
Mediterranean waters [16],
Acknowledgements. This study was performed as part of “National Programme
for Antarctic Research” and was fmancially supported by ENEA through a joint
research programme.
References
1. Dunbar RB, Anderson JB, Domack EW, Jacobs SS (1984) Océanographie influences on sédimentation along the Antarctic continental shelf. In: Jacobs SS (ed.) Oceanology of the Antarctic
Continental Shelf. Am Geophys Union, Washington, DC, pp 291-312
2. Anderson JB, Brake FC, Myers NC (1984) Sédimentation on the Ross Sea continental shelf,
Antarctica. Mar Geol 57:295-333
3. Accornero A, Bergamasco A, Monaco A, Tucci S (1998) Particle fluxes at the edge of the Ross Ice
Shelf: the rôle of physical forcing (This Vol.)
4. Strickland JDH, Parsons TR (1968) A practical handbook of seawater analysis. Bull Fish Res Board
of Canada 167:1-311
5. Pierce JW, Tucci S, Fierro G ( 1981 ) Assessing variation in suspensates, Ligurian Sea (northwestern
Mediterranean). Geo-Marine Letters 1:149-154
6. Krank K, Milligan T (1978) The use of the Coulter Counter in studies of particle size-distribution.
Aquatic Environment, Bedford Institute of Oceanography Dartmouth, Canada, Rep Ser BI-R-79-7,48
7. Jacobs SS, Fairbanks RJ, Horibe Y (1985) Origin and évolution of water masses near the Antarctic
Continental Margin: evidence from H2I8O/H216O ratio in seawater. In: Jacobs SS (ed) Oceanology
of the Antarctic Continental Shelf. Am Geophys Union, Washington, DC, pp 59-85
8. Budillon G, Conversano F, Giaquinto G, Morgigni M (1995) Idrologia del Mare di Ross. PNRA
Rapp Ant 95(02):428-435
9. Hayes DE, Davey FJ (1975) Geophysical study of the Ross Sea, Antarctica. Initial Rep DSDP, 28:887907
10. Vanney JR, Falconer RKH, Johnson GL (1981) Geomorphology of the Ross Sea and adjacent
oceanic provinces. Mar Geol 41:73-102
11. Carter L, Mitchell JS, Day NJ (1981) Suspended sédiment beneath permanent and seasonal ice,
Ross Ice Shelf, Antarctica. New Zealand, J Geol Geophy 50,24:249-262
12. Biscaye PE, Eittreim SL (1977) Suspended particulate loads and transports in the nepheloid layer
of the abyssal Atlantic Océan. Mar Geol 23:155-172