Hydrography and hydro chemistry from March to July 1976 in Fauskangerpollen, western Norway
Johannessen, Per J.; Heimdal, Berit Riddervold; Johannessen, Per J.; Institute of Marine Biology, University of Bergen; Heimdal, Berit Riddervold; Institute of Marine Biology, University of Bergen
Журнал:
Sarsia
Дата:
1979
Аннотация:
AbstractHydrography and nutrients (phosphate/total P, nitrate/nitrite, and silicate) were studied at a station in Fauskangerpollen near Bergen on three days in 1976, one in March, one in May, and one in July. The surface layers were highly stable, while there were only small density gradients in deeper layers. While oxygen conditions were good in the upper layers, the bottom layers were stagnant with H<sub>2</sub> S being produced. An inflow took place in the middle layers between March and May. Nutrient concentrations were high throughout the water column in March, but decreased in the top layers during spring due to consumption in primary production. The stagnant bottom layers acted as a ‘nutrient trap’ and had extremely high nutrient concentrations. Variations coinciding with the tidal cycle were observed, a result of change in surface level due to tidal movement, such that samples were taken relatively nearer the bottom at low tide than at high tide. This means that when samples were taken at a level with large gradients, there were larger variations corresponding to the tidal cycle.
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