. L'Est de la mer de Béring Tablette : océanographie et ressources / edited by Donald W. Hood et John A. Calder . GIL 020:21:10:23 5399 lOFE'SOO 20JAN76 13H4 OlE S Figure 5-11. Une image satellite infrarouge de la mer de Béring, le 20 janvier 1976. La péninsule d'Alaska, des îles Pribilof, l'île Nunivak, et d'autres caractéristiques du sol montrent clairement. Le pack de glace au sud de l'étendue de l'île Nunivak, avec certains des linéations typique, la plupart ayant tendance est à l'ouest et parallèle à la glace avant, près du bord de la glace. Streamer léger nuages, la normale au front glaciaire et parallèle au vent, étendue vers le sud. Fig. 5-12 montre moi

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. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . GIL 020:21:10:23 5399 lOFE'SOO 20JAN76 H4 13S OlE Figure 5-11. An infrared satellite image of the Bering Sea on 20 January 1976. The Alaska Peninsula, Pribilof Islands, Nunivak Island, and other land features show clearly. The ice pack extended south of Nunivak Island, with some typical lineations, mostly tending east-west and parallel to the ice front, near the edge of the ice. Thin streamer clouds, normal to the ice front and parallel to the wind, extended southward. Fig. 5-12 shows measured currents and estimated winds. FLOW REGIMES AND HYDROGRAPHIC DOMAINS We have used flow regimes as a framework for discussion in the preceding sections, and now we summarize their characteristics (Table 5-7). As with the nearly coincident hydrographic domains (preced- ing chapter), our description is biased toward sum- mer. The discussion of seasonal variation showed, however, that many of the differences between regimes persist throughout the year. Energy of the fluctuating flow was 90 percent tidal over the middle shelf, about 80 percent in the coastal regime, but only 60-70 percent in the outer regime, where up to 30 percent of the energy was at periods greater than two days (Table 5-3). Inertial energy was about 1 percent of the energy in the outer regime, but barely detectable in the two shoreward regimes. The increase in tidal energy per unit mass in these two regimes is a consequence of shoaling. Larger fluctuating kinetic energy values at low frequencies in the outer regime probably reflect variability of the persistent westward-flowing current there. Oceanic currents usually have unsteady components with periods of a few days or longer. Spatial differences also appeared in coherence

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