mab was up-canyon. These observations suggest a convergence of the mean 

 Eulerian flow between 300 and 600 m and possibly several cells of 

 recirculation along the canyon axis. However, because of the energetic, 

 non-linear, high-frequency motion observed in the canyon and the small 

 spatial scales, the mean Eulerian current may not indicate the actual 

 Lagrangian water-particle motion. Further analysis is required to 

 determine the Lagrangian circulation pattern. Measurements made on the 

 eastern rim of the canyon at about 200 m show westward flow directly 

 across the canyon axis. Measurements on the eastern wall of the canyon, 

 just a few km away at comparable depths, show northward inflow along the 

 eastern wall. Measurements on the western wall show southward outflow. 

 The mean Eulerian currents in the canyon thus suggest a complex vertical 

 Eulerian circulation along the axis and horizontal exchange along the 

 canyon walls . 



The current fluctuations within the canyon are aligned with the 

 canyon axis. The strength of the high-frequency fluctuations (motions 

 with periods shorter than about one day) increase toward the bottom and 

 the head of the canyon. The low- frequency currents (motions which 

 fluctuate at periods longer than about 2 days) were strongest over the 

 slope and weakest in the canyon. Alongshelf current fluctuations over the 

 shelf were correlated with cross-shelf flow over the canyon mouth 

 (offshelf for southwestward flow), suggesting enhanced cross-shelf 

 exchange in the region of the canyon. The fluctuations at semidiurnal 

 periods dominate the current spectra; near the canyon head their strength 

 changes substantially with time, indicating random generation of internal 

 wave packets. 



Similar studies in nearby Oceanographer Canyon show that the currents 

 are dominated by the tidal currents and are stronger than in Lydonia. Net 

 Eulerian down-canyon flow was observed at both 200 and 600 m. 



B-5 



