1 fluctuations in those five different frequency bands, where at 300 



2 meters deep, we have an instrument at 100 meters just above the canyon 



3 rim, and then two within the canyon axis. 



4 The canyon axis is roughly northwest-southeast here. You can see 



5 that above the canyon rim the low-frequency flows are essentially across 



6 the canyon parallel to the shelf isobaths, whereas within the canyon, 



7 the flows are all parallel --essentially parallel or channelled by the 



8 canyon. 



9 The most important for sediment transport and circulation is the 



10 mean flow, or at least the direction of the mean circulation. I've 



11 tried to summarize--let show you first the data from one. This is from 



12 one deployment of moored array, in which we had instruments at about 15 



13 stations. 



14 I've tried to highlight, color coded, the observations by shelf in 



15 green, canyon in red, slope in blue, and near bottom highlighted in 



16 orange. This shows the mean flow over about a 6 month period from 



17 November to April . 



18 On the shelf in green, we can see flow essentially parallel to the 



19 isobath to the west, as we predicted from the regional picture, and it 



20 essentially goes right across the canyon axis. 



21 Any suspended matter which is carried in that mean flow, can then 



22 be trapped in the axis. On the adjacent slope, we see in the blue 



23 arrows, during this particular period, we see a strong flow towards the 



24 northeast. 



25 This is caused by major Gulf Stream eddies to south of the canyon, 



26 and the clockwise flow around those causing northeastward flow. When 



27 those are not there, we see southwestward flow. 



28 Within the canyon, the flow is more complex and I won't show you 



29 on this picture, but I'll show a schematic where we've tried to 



30 summarize the flow both within the canyon and on the adjacent shelf. 



31 Again, in green we see essentially westward flow at all depths 



32 across the canyon axis. At about 200 meters in the canyon, the red 



33 arrows, we saw essentially northward flow on the west side--northward 



34 flow on the east side and southward flow on the west side, suggesting at 



24 



