Zooplankton diel vertical migration and influence of upwelling on the biomass in the Chukchi Sea during summer

摘要: The diel vertical migration (DVM) of zooplankton and the influence upwelling on biomass were examined using water column data current velocity mean volume backscattering strength (MVBS) collected by moored acoustic Doppler profilers (ADCPs) deployed in southeastern Chukchi Sea during 5th Chinese National Arctic Research Expedition (CHINARE) summer 2012, combined with satellite observational such as sea surface temperature (SST), wind, chlorophyll a (Chl a). Hourly continuously for 49-d mooring site. Spectral analysis indicated that there different migrating patterns zooplankton, even though precisely classifying taxa was not available. prevailing 24-h cycle corresponded to normal DVM swimming upwards at sunrise returning deep waters sunset. There clear upper 17 m period distinct day-night cycles, no active throughout when sun above horizon (polar day), suggesting light intensity trigger DVM. Also second pattern 12-h cycle. event occurring northwest Alaskan coastal area had important During upwelling, SST close site dropped significantly from maximal 6.35°C minimal 1.31°C within five days. Simultaneously, rapid increase MVBS Chl level, aggregation related upwelling.