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By John J. Walsh

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Extra resources for On the Nature of Continental Shelves

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1983). , 1982; Vidal and Smith, 1986), for example, have a threefold larger body size than their counterparts at Station P. Although there is little indication of food limitation of these grazers on the Bering shelf, they remove only 18-75% of the daily primary production here. It is possible that these copepods are instead omnivores at Station P, feeding on both the microzooplankton and the picoplankton. After overwintering as adults in deep waters of the North Pacific (Heinrich, 1962a; C. B.

N 0 3 1 _ 1 over the 30 m and 50 m depths of the September water column at Station P (Fig. 2 mg N0 3 m~4. 6 mg C m - 2 day -1 with a C/N ratio of 6 : 1. 8 mg C m - 2 day -1 from the temporal and spatial changes of nitrate, compared to the measured average production of 600 mg C m~2 day -1 (Fig. 21), suggests that "new" production is —50% of the total production at Station P. This result is similar to other measurements on the con­ tinental shelves (Walsh, 1983) and even within the Sargasso Sea when nitrate is abundant (Platt and Harrison, 1985).

They are a series of non­ linear expressions, requiring judicious deletion, or scaling of the forces, to allow solution. Ignoring both tidal motion and the curvature of the Earth over scales of motion less than 1000 km, these equations can be written in a local Cartesian coordinate system of JC, y, z axes with the respective u, v, w components of the velocity field (V*) taken as positive eastward, northward, and upward from the sea surface.

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