upper ocean Atlantic Ocean 4 Atlantic Ocean (Southwest) 4 Brazil-Malvinas Confluence 4 Southwestern Atlantic 4 abundance 4 biomass 4 chlorophyll 4 community structure 4 copepods 4 crustacean 4 normalized biomass size spectra 4 population density 4 population distribution 4 size structure 4 summer 4 trophic level 4 zooplankton 4 Antarctic Intermediate Water 2 Antarctic intermediate waters 2 Argentina 2 Buenos Aires [Argentina] 2 Continuous deposition 2 Contourite depositional systems 2 Deposits 2 Drift deposition 2 El Nino-Southern Oscillation 2 El Niño/Southern Oscillation (ENSO) 2 Holocene 2 Mar del Plata Harbor 2