During a 25-hour hydrographic times series at two stations near the head of Monterey Submarine Canyon, an internal tide was observed with an amplitude of 80 to 115 m in water depths of 120 and 220 m respectively. These large oscillations produced daily variations in hydrographic and chemical parameters that were of the same magnitude as seasonal variations in Monterey Bay. Computed velocities associated with the internal tide were on the order of 10 em/sec, and this tidally induced circulation may have a significant role in the exchange of deep water between Monterey Submarine Canyon and the open ocean.

"Monterey Bay (Fig. 1) is an open embayment located on the central California coast. The surrounding coastline is moderately populated with 20 small cities and towns, having a total population of approximately 300,000. These municipalities discharge sewage via ten domestic sewer outfalls, of which eight discharge into the bay and two into the bay's tributaries (Harville 1971). Industrialization is sparse, but industrial wastes from a Pacific Gas and Electric power plant, Kaiser Refractories magnesia plant, and fish canneries enter the bayo A large area of land in the drainage basins tributary to Monterey Bay is cultivated perennially; thus, the bay is subject to agricultural runoff"--Introduction