During RADMED cruises some fixed stations located all around Spanish Mediterranean coast are sampled following the same methodology since 1992 in some stations like those located in the westernmost part of Alboran Sea. At each station, a CTD cast is taken as well as water samples to determine : pH, Alkalinity, Chlorophyll  and nutrients concentration, phytoplankton (micro, pico and nanoplankton) and zooplankton,

The main objective is to obtain climatological values, variability ranges and the detection of possible trends of the different variables sampled.