Small time and spatial scale variability of phytoplankton biomass on the north Norwegian shelf in 1995
Babichenko, S.; Wassmann, P.; Poryvkina, L.; Andreassen, I. (1999). Small time and spatial scale variability of phytoplankton biomass on the north Norwegian shelf in 1995. Sarsia 84: 293-302
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827; e-ISSN 1503-1128, meer
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| Auteurs | | Top |
- Babichenko, S.
- Wassmann, P.
- Poryvkina, L.
- Andreassen, I.
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| Abstract |
The temporal and spatial short-term variability of phytoplankton biomass was investigated in spring, summer and autumn in a polygon crossing the north Norwegian shelf between the two coastal banks Sveinsgrunnen and Malangsgrunnen. In addition to traditional sampling (CTD, nutrients and chlorophyll a ),a remote sensing lidar technique was used to continuously investigate the phytoplankton biomass. The number of sensing spots on each of the 6 tracks through the polygon (lasting for about 18 hours) corresponded to about 100 000 sampling procedures. The penetration depth of the lidar ranged from 15 to 30 m.High spatial and temporal short-term dynamics (1.5-2.5 nautical miles,2 days) were recorded, apparently due to patches of phytoplankton (up to 4 times above background concentrations)observed in the study area. No strong relationship between variable water masses (as defined by temperature and salinity) and phytoplankton biomass could be established in the polygon. Care must be taken to interpret seasonal or spatial phytoplankton distribution on the north Norwegian shelf when sampling is carried out at time intervals greater than 1 day and spatial resolution more than 2 nautical miles. |
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