. L'Est de la mer de Béring Tablette : océanographie et ressources / edited by Donald W. Hood et John A. Calder . 0,0 0,5 1,0 1,5 2,0 0,5 cycles/sec 1,0 1,5 2,0 cycles/sec Figure 5-7. La cohérence horizontale au carré. Même à une séparation de 72 km et de basse fréquence (-0,3 CPD) cohérence squared est près de 0,6, et à 30 km elle dépasse 0,7. La cohérence horizontale est plus élevé au cours de la clayette du milieu (illustré ici) que dans les zones côtières ou à l'extérieur de régimes. Aiguilles composants ont des lignes pleines. Passes (comme l'Unimak Pass). Dans de nombreux flux de ces laissez-passer ont des vitesses moyennes supérieures à 100, scalaire cm/sec (voir U.S.D.C. 1

• Contributeur: The Bookworm Collection / Alamy Banque D'Images
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. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 0.0 0.5 1.0 1.5 CYCLES/DRY 2.0 0.5 1.0 1.5 CYCLES/DRY 2.0 Figure 5-7. Horizontal coherence squared. Even at a separation of 72 km, low-frequency (-0.3 CPD) coherence squared is nearly 0.6, and at 30 km it exceeds 0.7. The horizontal coherence was higher over the middle shelf (shown here) than in the coastal or outer regimes. Clockwise components have solid lines. Passes (such as Unimak Pass). Flows in many of these passes have high mean scalar speeds, exceeding 100 cm/sec (see U.S.D.C. 1964), but these are mostly caused by tidal currents and may average to a vector mean of zero. Properties (e.g., salt and drift cards) can be exchanged between the North Pacific and Bering Sea through such a pass; it is unlikely that the same volume of water flows back and forth on ebb and flood, and the vigorous stirring near coast and bottom prevents such a volume of water from remain- ing intact. Practically, it is difficult to measure the mean flow in such passes with present techniques. For many oceanographic questions, the mean flow is not as important as the exchange of properties between two oceanic regimes and the mixing by vigorous tidal stirring.'* Just as obviously, the mean circulation over the Bering Sea shelf, even if much smaller than the tidal currents, can importantly influence many processes. For instance, plankton advected by a 2 cm/sec vector mean flow would travel about 150 km over the summer. Such a small mean flow is difficult to measure in a highly variable and active (noisy) back- ground. The 2 cm/sec mean flow may be important, but separating it from the tidal and other variable currents with statistical significance requires measure- ments of long duration. For example, we had six "Mean flow is often assumed through Unimak Pass into the Bering Sea; we know no evidence for this, only for an ex- change between the Bering and the North Pacific. diff

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