60 mile x 30 mile grid in the Southern Baltic Sea

Ammonium and ammonia concentration parameters in water bodies; Air pressure; Air temperature; Cloud cover height and extent; Chlorophyll pigment concentrations in water bodies; Nitrate concentration parameters in the water column; Phytoplankton taxonomic abundance in water bodies; 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); Dissolved total and organic nitrogen concentrations in the water column; Dissolved total or organic phosphorus concentration in the water column; Phytoplankton taxonomic volume in water bodies; Zooplankton taxonomy-related abundance per unit volume of the water column; Nitrite concentration parameters in the water column; Silicate concentration parameters in the water column; Temperature of the water column

PEX was an intensive multi-ship exercise designed to elucidate and quantify small-scale structures in the Baltic Sea. Scientific objectives included investigating the role of physical, chemical and biological interactions in determining ecological stability, as well as providing a statistical basis for assessing the significance of environmental data collected for monitoring purposes. PEX was a regimented exercise with research ships working stations along one line of an 11x6 grid. Two sizes of grids were employed, the larger one being called the eddy grid. Within this grid, 4 ships anchored and worked hourly stations during the period of the expedition. In addition 11 current meter moorings were deployed at strategic places within the eddy grid. The Swedish data were collected by R/V Argos, R/V Svanic, Coast Guard vessel Tv171 and a Coast Guard airplane. The data has been quality controlled.

Anon (1989) ICES-Cooperative Report 163, ICES

Swedish Meteorological and Hydrological Institute
Folkborgsvagen 1
Norrkoping

SE-601 76
Sweden