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The influence of biological activity and physical stability in determining the chemical distributions of inorganic phosphate, silicate and nitrate

Published online by Cambridge University Press:  11 May 2009

R. D. Pingree
Affiliation:
Institute of Oceanographic Sciences, Wormley, Surrey
Linda Maddock
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth
E. I. Butler
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth

Extract

Temperature, salinity and nutrient structure at a station, E1, in the English Channel 22 miles from Plymouth have been described for many individual years (see Armstrong & Butler, 1968, for example). By averaging the results gathered over many years (1903–61) the mean seasonal changes in the vertical distributions have been obtained (Pingree & Pennycuick, 1975). In this paper these distributions have been extended to incorporate data to 1975 and as well as presenting up-to-date mean distributions for temperature, salinity and inorganic phosphate, the mean distributions for silicate and nitrate are included. The purpose of the present work is to interpret the observed mean seasonal changes in the inorganic nutrient distributions in the light of recent measurements giving continuous variations of chemical properties (Armstrong & Lafond, 1966), and in particular, from the knowledge gained from continuous vertical chlorophyll ‘a’ determinations (Lorenzen, 1966; Holligan & Harbour, 1977; Pingree, Holligan & Head, 1977).

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1977

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