Meso-scale surveys: area restricted by latitude 22° 15 min - 22° 45 min E and latitude 59° 15 min - 59° 25 min N. Anchor station at 59° 17 min N, 22° 33 min E.

Chlorophyll pigment concentrations in water bodies; Wind strength and direction; Nitrate concentration parameters in the water column; Phosphate concentration parameters in the water column; Primary production in the water column; Salinity of the water column; Horizontal velocity of the water column (currents); Silicate concentration parameters in the water column; Temperature of the water column; Turbulence in the water column; Phytoplankton taxonomic abundance in water bodies; Density of the water column; Phytoplankton taxonomic biomass in water bodies

Fluorometers; current profilers; CTD; CTD undulators; discrete water samplers; autoanalysers; liquid scintillation counters; microstructure sensors; current meters

The cruise started with a pilot study over a grid of 12 stations (45x25 km) on 15-16 July. On 17-26 July an intensive study was carried out. It consisted of nine night-time mesoscale towed CTD/fluorometer and flow-through surveys and 10 daytime intensive biological-chemical samplings at an anchor station. During the mesoscale surveys, salinity, temperature and fluorescence were measured and samples for nutrient and phytoplankton analyses were taken from the depth of ca. 5 m with a flow-through system. At the anchor stations measurements/samplings of turbulence, CTD, fluorescence, nutrients, phytoplankton, nitrogen fixation and primary production were made. Special attention was paid on the phytoplankton spatial and temporal variability under a complex hydrodynamical influence (downwelling, anticyclonic eddy, jet). On 26 July a cross front section of 8 stations (CTD and turbulence) was performed.

Baltic Organisations Network for Funding Science EEIG
Hämeentie 33
Helsinki

FI-00500
Finland