The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 996 Plankton ecology bottom contour with an average net flow of 1 cm/sec; the effect of flow upon the transport or dispersion of eggs in the study area can hence be ignored. On the other hand, tidal current is known to play an impor- tant role in energy exchange between oceanic water and shelf water on a scale of 5 cm/sec; the effect of this flow on egg distribution, however, has not been assessed. A discussion of the physical o
The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 996 Plankton ecology bottom contour with an average net flow of 1 cm/sec; the effect of flow upon the transport or dispersion of eggs in the study area can hence be ignored. On the other hand, tidal current is known to play an impor- tant role in energy exchange between oceanic water and shelf water on a scale of 5 cm/sec; the effect of this flow on egg distribution, however, has not been assessed. A discussion of the physical oceanography of the eastern shelf region is given in Section I, Volume 1 of this book. The bottom and surface temperature regimes are considered to be most important for walleye pollock, since the former plays a role in determining the extent of distribution of the spawning population and the latter regulates directly the developmental proc- esses of the eggs laid. The distributions of surface and bottom isotherms in the study area indicated an increase of temperature from northeast to southwest or from the shallow shelf to the slope, parallel with the bathymetric contours (Fig 59-2). In the surface layer, the and isotherms coincided with the 100- and 200-m isobaths in Phase 1, and the 3-C and 4-C isotherms with the 100- and 200-m isobaths in Phase 2. This relation, however, was obscure north of Unimak Island and the middle of the outer shelf, where the isotherms seem to extrude northward. This extrusion may be attributed to the northeasterly flow (West Alaskan Current: Favorite et al. 1976) from Unimak Pass and the central Bering Sea along the Alaska Peninsula, although it has been claimed that there is no evidence of inflow toward inner Bristol Bay along the Alaska Peninsula (Coachman and Charnell 1979). In the bottom layer, the parallel- ism of the and 3-C isotherms with the 100-m SURFACE MID-APRIL,1978 r croRGE 1 â ^o- '-' -^ :^v°- --\ >. > r'' X
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