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Title: Drivers of Plankton Distribution Across Mesoscale Eddies at Submesoscale Range
Authors: Hernández-Hernández, Nauzet 
Arístegui, Javier 
Montero, María F. 
Velasco-Senovilla, Esther
Baltar, Federico
Marrero-Díaz, Ángeles 
Martínez-Marrero, Antonio 
Rodríguez-Santana, Ángel 
UNESCO Clasification: 2510 Oceanografía
Keywords: Canary Islands
Eddy Pumping
Mesoscale-Submesoscale Interactions, et al
Issue Date: 2020
Project: Remolinos Oceanicos y de Posición Atmosferica (Roda): Dinámica y Monitorización de Remolinos Oceanicos en la Corriente de Canarias 
Estudios de la Bomba Vertical Oceánica en Remolinos de Mesoscala 
Flujos de Carbono en Un Sistema de Afloramiento Costero (Cabo Blanco, Nw de Africa). Papel Del Carbono Disuelto y en Suspension en El Contexto de la Bomba Biologica. 
Tropical and South Atlantic - climate-based marine ecosystem prediction for sustainable management 
Journal: Frontiers in Marine Science 
Abstract: Cyclonic and anticyclonic eddies are common mesoscale features in the flow past the Canary Islands throughout the year. While drifting southward, eddy pairs interact among them but also with upwelling filaments and eddies generated at the coastal jet of the nearby African upwelling system. These interactions force the generation of frontal zones where ageostrophic secondary circulation (ASC) may occur. With the aim of contributing to understand how meso-submesoscale interactions modulate plankton distribution, we carried out an interdisciplinary cruise across a mesoscale eddy field. The sampled region was characterized by the presence of a cyclonic eddy interacting with two anticyclonic eddies and an upwelling filament. High-resolution sampling allowed us to assess the upwelling/downwelling processes associated with eddy pumping and ASC, the injection of nutrients into the euphotic zone, and the subduction of particles related to these processes. The planktonic community, which included heterotrophic bacteria, cyanobacteria-like Prochlorococcus and Synechococcus, pico and nanoautotrophic eukaryotes, and heterotrophic nanoflagellates, showed a heterogeneous distribution in response to meso-submesoscale processes. Redundancy analysis and plankton distribution suggest that while the distribution of small organisms (picoplankton) is modulated by a combination of physical and biogeochemical drivers, the distribution of larger autotrophic and heterotrophic nanoflagellates is modulated by nutrient inputs and grazing, respectively. These observational results provide new insights in the study of the impact of mesoscale structures in the dynamics of nutrients, chlorophyll and planktonic communities, and valuable to validate theoretical and modeling studies.
DOI: 10.3389/fmars.2020.00667
Source: Frontiers in Marine Science [EISSN 2296-7745], v. 7, (Agosto 2020)
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