Bepaling van de primaire productie tijdens de Phaeocystisbloei in het voorjaar van 1980 in de Zuidelijke Bocht van de Noordzee door middel van in vivo zuurstofmetingen
Eijgenraam, A. (1982). Bepaling van de primaire productie tijdens de Phaeocystisbloei in het voorjaar van 1980 in de Zuidelijke Bocht van de Noordzee door middel van in vivo zuurstofmetingen. Interne verslagen Nederlands Instituut voor Onderzoek der Zee, 1982(2). NIOZ: Texel. 37 pp.
Part of: Interne verslagen Nederlands Instituut voor Onderzoek der Zee. Nederlands Insituut voor Onderzoek der Zee.
Primary production of oxygen and carbon in the Southern Bight of the North Sea was estimated by determining diurnal variations in oxygen concentration of a watermass. Oxygen determinations were carried out according to the method of Winkler with spectrofotometric end- point detection. Titrant was added with a motorburette which was built at the NIOZ. Gauging of the burette with mercury showed that small volumes could be measured with good reproducibility. In March a "steady state" existed with no nett production and only small nett light and gross production. In April a widespread Phaeocystis-bloom was found with high production of oxygen and carbon. The maximum in the velocity of oxygen production increased from day to day. This increase was related to nett carbon production in the previous day. An estimate of total phytoplankton biomass in the watercolumn was made with this relation. Oxygen concentrations at 5 m and 20 m depth showed a diurnal variation in respect to mean oxygen concentrations in the watercolumn. The coefficient of vertical diffusion was estimated from this diurnal variation.
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