An Anomalous Increase of Temperature in the Ocean off the Pacific Coast of Canada through 1957 and 1958

Abstract

The temperature increase extended from the surface to nearly 500 m depth. Its progress is shown by temperature distribution on the isopycnal surface, σ t = 26.60, which is in the halocline, immediately below the depth of seasonal influence. During this period the currents veered northward and strengthened. The spawning migration of sockeye salmon (Oncorhynchus nerka) in the ocean was shifted northward and delayed in association with these anomalous oceanographic conditions.