The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberings00hood Year: 1981 66 Physical oceanography 62°- 61 60°- 59°- 58° 57°- 56°- 55°- 54°- BC CURRENT METER MOORINGS ~IOm ABOVE BOTTOM ~20m BELOW SURFACE 180 DAYS PER BARB KILOMETERS 50 meters I 00 meters 200 meters 2000 meters Figure 5-8. Mean flow. The mean for all records at each mooring site is shown. Coastal and outer regime moorings generally had statistically significant means, while middle shelf sites did not. The domains refer to hydrographic structure (preceding chapte
The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberings00hood Year: 1981 66 Physical oceanography 62°- 61 60°- 59°- 58° 57°- 56°- 55°- 54°- BC CURRENT METER MOORINGS ~IOm ABOVE BOTTOM ~20m BELOW SURFACE 180 DAYS PER BARB KILOMETERS 50 meters I 00 meters 200 meters 2000 meters Figure 5-8. Mean flow. The mean for all records at each mooring site is shown. Coastal and outer regime moorings generally had statistically significant means, while middle shelf sites did not. The domains refer to hydrographic structure (preceding chapter), but the domains and flow regimes are nearly coincident. These measurements are strong evidence for flow across the shelf break near the Alaska Peninsula (note BC-14, Fig. 5-8), but hydrographic and current measurements also demonstrated that this flow is probably intermittent. Mean flow over both the outer and coastal regimes appeared to be driven by pressure gradients caused by density differences. The method of inferring flow from dynamic calculations, referred to the deepest common depth of nearby hydrographic stations, gave approximate agreement with direct measurements (Coachman and Charnell 1979, Schumacher et al. 1979). Dynamic topographies in the outer regime (Kinder 1977, Coachman and Charnell 1979, Kinder et al. 1978) indicated westward flow of ~5 cm/sec. Calculations across the inner front (near the 50 m isobath) yielded 1-2 cm/sec flow counterclockwise along the front and westward between Cape Newen- ham and Nunivak Island (Schumacher et al. 1979). Thus mean flow in both the outer and coastal regimes can be inferred from the density field, but this is not true of the middle shelf, where the mean is nearly zero. Dynamic topographies do suggest a very weak southeastward flow across the middle regime (, Kinder 1977, Reed 1978, and Kinder et al. 1978), but the current records (Fig. 5-8) did not confirm this flow. Synthesizing our knowledge of the shelf c
Size: 1527px × 1310px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
