Hydrology and circulation in central and southern Cook Strait, New Zealand

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Abstract
The circulation and hydrology of Cook Strait are defined using both the geostrophic method and the hydrologiieal characteristics of the different water masses. Cool, low salinity water in a branch of the Southland Current, which extends along the east coast of the South Island into Cook Strait, mixes above the depth of the continental shelf with warmer, more saline Subtropical Water from both the D'UrVille Current and the East Cape Current. Subtropical Water derived from the East Cape Current occupies the Cook Strait Canyon; below 100 m this water meets the Subtropical Water of the southwest‐flowing D'Urville Current in a convergence situated in the Oook Strait Narrows. Mixed water derived from all three currents passes eastwards across Cook Strait and up the east coast of the North Island.

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