. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 21 NOV 23 NOV 140° 160° 180° 160° 140° 120° ^ \ x' ^\A///i^ ^ m ^^^:^*^ /L3yy' j m; iDrVVr^ ^ 60° 55° 5! ^1 ^' / ^ 55' 50° t^ â ^^// \^ 1^ 4 ^V-12V^ V \ 50" L -r^ i ^25v / ;1 t- 1 \v \ \ A -tT \ \ \ 170° 180° 170° 160° 150° Figure 7-17. Charts of surface atmospheric pressure for 0000 Z 21-24 Nov. 1976, taken to represent midday conditions the day before. The chart covers the area from the north Pacific to the Arctic Ocean, with Alaska on the right and Siberia on the le
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 21 NOV 23 NOV 140° 160° 180° 160° 140° 120° ^ \ x' ^\A///i^ ^ m ^^^:^*^ /L3yy' j m; iDrVVr^ ^ 60° 55° 5! ^1 ^' / ^ 55' 50° t^ â ^^// \^ 1^ 4 ^V-12V^ V \ 50" L -r^ i ^25v / ;1 t- 1 \v \ \ A -tT \ \ \ 170° 180° 170° 160° 150° Figure 7-17. Charts of surface atmospheric pressure for 0000 Z 21-24 Nov. 1976, taken to represent midday conditions the day before. The chart covers the area from the north Pacific to the Arctic Ocean, with Alaska on the right and Siberia on the left. gradients were directly over the Bering Strait region and the isobars had an extended north-south orienta- tion. The situation held over 22 November, although the pressure gradient was less as the low began filling, and by 23 November these conditions had dissipated. Southerly transports of â Sv and â Sv were recorded on 22 and 23 November (Fig. 7-16). The mechanism which drives major south flow events now seems clear. Strong north winds must develop over the whole northern Bering Sea, not just over the immediate region of Bering Strait. Large- scale, strong atmospheric pressure cells are required, a low well to the southeast and a high well to the west. The strong northerly winds generated thereby move water southward off the entire northern Bering Sea shelf. Removal of sufficient water off the northern shelf generates a sea-level slope down to the south (sea-level slope has been shown to be the major force driving transport through the strait (Coachman et al. 1975)). This, together with the strong north winds caused by the east-west atmospheric pressure gradient aligned over the system, drives enhanced southerly transport. It apparently requires about one day for development of these conditions, so that maximum south transport occurs the following day. Because the system behaves to a marked degree as a coherent
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