The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberings00hood Year: 1981 Circulation over the shelf of the southeastern Bering Sea 67 Figure 5-9. Estimated mean circulation. No strong distinction is made as to season or deptii, altiiough it is biased toward summer and the surface. The dashed arrows in the northern coastal regime express uncertainty, while the arrow along the Alaska Peninsula expresses intermittency. Flow over the shelf is mostly tidal, so that the instantaneous flow is quite different from this depiction. For
The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberings00hood Year: 1981 Circulation over the shelf of the southeastern Bering Sea 67 Figure 5-9. Estimated mean circulation. No strong distinction is made as to season or deptii, altiiough it is biased toward summer and the surface. The dashed arrows in the northern coastal regime express uncertainty, while the arrow along the Alaska Peninsula expresses intermittency. Flow over the shelf is mostly tidal, so that the instantaneous flow is quite different from this depiction. For instance, over the middle shelf we expect the speed at any time to exceed 20 cm/sec even though the long-term vector mean is less than 1 cm/sec, and instantaneous directions seldom agree with the arrows at any location. The scheme is also incomplete: the source of water for the westward transport in the coastal regime is not shown. We speculate about this source in the text. lation, we have constructed a circulation scheme (Fig. 5-9). We emphasize again that the mean circulation is only a few percent of the total kinetic energy, and that even our lairge data sets do not define the mean flow adequately at some locations. That is, the arrows in Fig. 5-9 will often be incorrect instantane- ously and scalar speeds will be much higher than the long-term vector means. Directions apply throughout the water column and speeds at the surface; speeds decrease significantly with depth seaward of the 100 m isobath. Our data are most extensive in summer (Table 5-1), but most data from other seasons agreed with this depiction. In the coastal regime we show counterclockwise flow extending northward to St. Matthew Island with speeds of a few cm/sec. Within Kvichak and Bristol bays, measurements show that the counterclockwise flow extends to the coast (Straty 1977). The dashed arrow paralleling the Alaska Peninsula signifies intermittent flow. In the middle regime we show
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