Hydrographical studies of Korsfjorden, western Norway, in the period 1972–1977

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Abstract
Korsfjorden is a threshold fjord with a deep basin (690 m) separated from the open sea and two inner fjord systems by sills at 250, 150, and 450 m respectively. Hydrographic casts with Nansen bottles were made first twice a month, later monthly, at one station mid-fjord and temperature, salinity, and oxygen measurements were recorded. This article is a sequel to an earlier paper on the hydrography of the fjord from 1968 to 1972. Korsfjorden is highly stratified in the uppermost 100 m and of relatively uniform density from 300 m to the bottom. Autumn flushing begins with the inflow of warm water from the Norwegian Trench. By winter and through spring and part of the summer, surface oceanic water (high oxygen content and salinity above 35.15 ‰) penetrates Korsfjorden at and below sill depth. The extent and regularity of this flushing allow the Korsfjord basin to remain aerated and to retain oceanic characteristics year round.