New Zealand Journal of Marine and Freshwater Research abstracts

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SEASONAL HYDROLOGY OF WATERS OFF THE OTAGO PENINSULA, SOUTH-EASTERN NEW ZEALAND

J. B. JlLLETT

Portobello Marine Biological Station and Zoology Department, University of Otago, Dunedin

Abstract Variations of temperature and salinity were observed off the Otago Peninsula from October 1966 to December 1967. In-shore temperatures were more variable than those seawards and variability decreased with increasing depth. Temperatures over the continental shelf and down to 200 m in the open sea varied seasonally. Below 200 m temperature variations were small and non-seasonal. Salinities were depressed in the shallow coastal waters by land run-off, this tendency being more pronounced in autumn and winter. Seawards of this coastal zone seasonal variations of salinity were small. Over the outer shelf a zone of higher salinities was always present. Beyond this zone salinities decreased with increasing distance from shore and with increasing depth. A salinity minimum was sometimes present between 500 and 1,000 m.

Although the upper 200 m were seasonally stratified, the same water masses could always be recognised. Two water masses were present near the surface, the Southland Current, here interpreted as being subtropical in origin, being located in shore of Subantarctic Surface Water. These two water masses are separated by the clearly defined Southland Front. Along the shore, neritic conditions develop through modification of Southland Current water by coastal and climatic effects. Seawards, beneath Subantarctic Surface Water, the core of Antarctic Intermediate Water could sometimes be recognised as a salinity minimum.

N.Z. Jl mar. Freshwat. Res. 3: 349-75
(Received for publication 2 January 1969)

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