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Some oceanographic features of Hebridean waters

Published online by Cambridge University Press:  05 December 2011

D. J. Ellett
D. J. Ellett
Affiliation:
Scottish Marine Biological Association, Dunstaffnage Marine Research Laboratory, Oban
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Synopsis

South of St Kilda, Atlantic water reaches the edge of the Continental Shelf west of the Hebrides from the eastern side of the Rockall Channel, whereas the main north-east going current from the western side of the channel probably lies close to the shelf-edge to the north of St Kilda. On the shelf, Atlantic water mixes with Clyde and Irish Sea water to the south-west of the Small Isles, and the mixed water so formed diverges to flow partly northward through the Little Minch and partly southward to Barra Head, then northward along the western coasts of the Outer Hebrides. On the outer shelf, dense winter-formed bottom water persists into the autumn, implying that advection is weak in this region in summer.

Data of temperature and salinity are sparse around the Outer Hebrides. Annual temperature cycles at depth on the shelf can be explained in terms of the cycle of wind mixing. A non-divergent Continental Shelf wave gives rise to strong diurnal components in the tidal streams upon the outer shelf and in the Sound of Harris, but causes no perceptible disturbance to the semi-diurnal rise and fall.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 77: The Natural Environment of the Outer Hebrides , 1979 , pp. 61 - 74
Copyright
Copyright © Royal Society of Edinburgh 1979

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References

Barnes, H. and Goodley, E. F. W. 1961. The general hydrography of the Clyde Sea area, Scotland, Part 1. Bull. Mar. Ecol., 5, 112–150.Google Scholar
Becker, G., 1975. Hydrographic investigations in the North Sea and British waters in summer 1973. Annls Biol., Copenh., 30, 31–34.Google Scholar
Binns, P. E., McQuillin, R. and Kenolty, N., 1974. The geology of the Sea of the Hebrides. Rep. Inst. Geol. Sci., 73/14, 43 pp.Google Scholar
Cartwright, D. E., 1969. Extraordinary tidal currents near St Kilda. Nature, Lond., 223, 928–932.CrossRefGoogle Scholar
Cartwright, D. E., 1974. An unusual tidal mode west of Scotland. In: Fisica del mari (Convegno internazionale, Trieste 13–16 October 1971), pp. 91–95. Rome: Accad. Naz. Lincei.Google Scholar
Craig, R. E., 1952. Hydrographic conditions in the Minch, September/October 1951. Annls Biol., Copenh., 8, 20–21.Google Scholar
Craig, R. E., 1956. Hydrographic conditions in the Minch and the northern approach to the Irish Sea. Annls Biol., Copenh., 11, 34–36.Google Scholar
Craig, R. E., 1959. Hydrography of Scottish coastal waters. Mar. Res., 2.Google Scholar
Craig, R. E. and Slinn, D. J., 1957. Hydrographic observations off the Scottish west coast and the northern Irish Sea, Autumn 1955. Annls Biol., Copenh., 12, 59–63.Google Scholar
Darbyshire, M. and Draper, L., 1963. Forecasting wind-generated waves. Engineering, Lond., 195, 482–484.Google Scholar
Dickson, R. R. and Lee, A. J., 1969. Atmospheric and marine climate fluctuations in the North Atlantic region. In: Progress in Oceanography, Sears, Mary, Ed., vol. 5, pp. 55–65. Oxford: Pergamon.Google Scholar
Dooley, H. D., 1974. Hypotheses concerning the circulation of the northern North Sea. J. Cons. Perm. Int. Explor. Mer, 36, 54–61.CrossRefGoogle Scholar
Draper, L. and Squire, E. M., 1967. Waves at Ocean Weather Ship Station India. Trans. Roy. Instn Nav. Archit., 109, 85–93.Google Scholar
Edelsten, D. J., Ellett, D. J. and Edwards, A., 1976. Preliminary results from current measurements at the Scottish continental shelf-edge. ICES, CM 1976 (C:12), 10 pp. (mimeo).Google Scholar
Elder, R. B., 1970. Oceanographic observations between Iceland and Scotland, July–November 1965. U.S. Cst Guard Oceanogr. Rep., 28.Google Scholar
Ellett, D. J., 1977a. Surface temperature and salinity anomalies in the Rockall Channel, 1948–1976. Annls Biol., Copenh., 33, 27–28.Google Scholar
Ellett, D. J., 1977b. Temperature and salinity in the Sea of the Hebrides, 25–29 May 1976. Annls Biol., Copenh., 33, 28–30.Google Scholar
Ellett, D. J. and Martin, J. H. A., 1973. The physical and chemical oceanography of the Rockall Channel. Deep Sea Res., 20, 585–625.Google Scholar
Ellett, D. J. and Roberts, D. G., 1973. The overflow of Norwegian Sea Deep water across the Wyville–Thomson Ridge. Deep Sea Res., 20, 819–835.Google Scholar
Hill, H. W., 1976. Hydrographic observations at Rockall during April–May 1969. Fish. Res. Tech. Rep., 24.Google Scholar
Hughes, D. G., 1976. A simple method for predicting the occurrence of seasonal stratification and fronts in the North Sea and around the British Isles. ICES, CM 1976 (C:1), 13 pp. (mimeo.).Google Scholar
Hydrographic Department, 1970. Underwater Handbook: Western Approaches to the British Isles. London: Ministry of Defence (N.P. 625).Google Scholar
Ices, , 1962. Mean monthly temperature and salinity of the surface layer of the North Sea and adjacent waters from 1905 to 1954. ICES, Service Hydrographique, Charlottenlund Slot.Google Scholar
Jefferies, D. F., Preston, A. and Steele, A. K., 1973. Distribution of Caesium-137 in British coastal waters. Mar. Pollut. Bull., 4, 118–122.CrossRefGoogle Scholar
Mann, C. R., 1967. The termination of the Gulf Stream and the beginning of the North Atlantic Current. Deep Sea Res., 14, 337–359.Google Scholar
Milne, P. H., 1972. Hydrography of Scottish west coast sea lochs. Mar. Res., 3.Google Scholar
Payne, R. and Craig, R. E., 1966. Temperature and salinity in Scottish waters, 1964. Annls Biol., Copenh., 21, 26–28.Google Scholar
Pollard, R. T., 1977. Near surface temperature and current data from JASIN 1976. JASIN News (1), 3–4. (Unpublished manuscript.)Google Scholar
Rossov, V. V. and Kislyakov, A. G., 1972. The polar front in the North Atlantic in 1968–69. Rapp. P.-V. Réun. Cons. Perm. Int. Explor. Mer, 162, 220–226.Google Scholar
Schultz, H., 1976. The temperature situation in the Hebrides area in summer and autumn 1973. Annls. Biol., Copenh., 31, 23–25.Google Scholar
Tait, J. B., 1957. Hydrography of the Faroe–Shetland Channel 1927–1952. Mar. Res., 2.Google Scholar
Tulloch, D. S. and Tait, J. B., 1959. Hydrography of the North-Western Approaches to the British Isles. Mar. Res., 1.Google Scholar
Warburg, H. D., 1946. Tidal Streams of the Waters Surrounding the British Isles, 2nd edn, pt 1. London: Admiralty, 599 pp.Google Scholar