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Three years of 300 kHz acoustic doppler current profiler data collected inthe central Ligurian Sea are analysed to investigate the variability of thezooplankton biomass and the diel vertical migration in the upper thermocline.After a pre-processing phase aimed at avoiding the slant range attenuation,hourly volume backscattering strength time series are obtained. Despite thelack of concurrent net samples collection, different migration patterns areidentified and their temporal variability examined by means of time–frequencyanalysis. The effect of changes in the environmental condition is alsoinvestigated. The highest zooplankton biomasses are observed in April–May justafter the peak of surface primary production in March–April. The mainmigration pattern found here points to a "nocturnal" migration, withzooplankton organisms occurring deeper in the water column during the day andshallower at night. Also, twilight migration is highlighted during this study.The largest migrations are recorded in November–December, corresponding tolowest backscattering strength values and they are likely attributable tolarger and more active organisms (i.e. euphausiids and mesopelagic fish). Theresults suggest further applications of the available historical acousticdoppler current profiler time series

Temporal variations of zooplankton biomass in the Ligurian Sea inferred from long time series of ADCP data