. The Composition of sea-water : comparative and descriptive oceanography. Seawater -- Composition. SECT. 4] THEORY OF FOOD-CHAIN RELATIONS IN THE OCEAN 449 where v and A are the phytoplankton sinking rate and vertical eddy coefficient as before. The analysis shows that there must be an exact balance of processes in order to maintain a steady state, which must satisfy the equation Pi(a + b2)l(Pi2-ab2) = tan fal (21) Furthermore, a steady state is not possible if v2 > 4Aoj1, and the depth of the Phytoplankton (arbitrary units) 0 4 6 8 10 I?. 20 40 Eddy diffusivity (4) 60 Fig. 4. (a) Vertical
. The Composition of sea-water : comparative and descriptive oceanography. Seawater -- Composition. SECT. 4] THEORY OF FOOD-CHAIN RELATIONS IN THE OCEAN 449 where v and A are the phytoplankton sinking rate and vertical eddy coefficient as before. The analysis shows that there must be an exact balance of processes in order to maintain a steady state, which must satisfy the equation Pi(a + b2)l(Pi2-ab2) = tan fal (21) Furthermore, a steady state is not possible if v2 > 4Aoj1, and the depth of the Phytoplankton (arbitrary units) 0 4 6 8 10 I?. 20 40 Eddy diffusivity (4) 60 Fig. 4. (a) Vertical distribution of phytoplankton calculated from equations (19) and (20), using four different values for vertical eddy diffusivity. (b) Relationship between eddy diffusivity and phytoplankton sinking rate that is required for maintenance of a steady state according to equation (21). productive layer must fall within the limits of 0 < / \ is equivalent to a daily increase of 10% in the upper layer, and o»2 is a 7% decrease below the depth /, which is set at 50 m. Only A and v vary, and their relationship, which must satisfy equation (21), is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hill, M. N. (Maurice Neville), 1919-. New York : Interscience Pub.
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