Articles | Volume 21, issue 4
https://doi.org/10.5194/os-21-1833-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-1833-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
29 Aug 2025
Research article |
| 29 Aug 2025
| 29 Aug 2025
Cross-canyon variability in zooplankton backscattering strength in a river-influenced upwelling area
Macarena Díaz-Astudillo
CORRESPONDING AUTHOR
Departamento de Física, Facultad de Ciencias, Universidad del Bío-Bío, Concepción, Chile
Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile
Millennium Nucleus for the Study of Deoxygenation in the Eastern South Pacific Ocean (DEOXS), Concepción, Chile
Manuel I. Castillo
Centro de Observación y Análisis del Océano Costero (COSTAR-UV), Universidad de Valparaíso, Valparaíso, Chile
Centro de Instrumentación Oceanográfica (CIO), Universidad de Concepción, Concepción, Chile
Pedro A. Figueroa
Department of Earth and Environment, Boston University, Boston, MA, USA
Leonardo R. Castro
Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile
Ramiro Riquelme-Bugueño
Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile
Millennium Nucleus for the Study of Deoxygenation in the Eastern South Pacific Ocean (DEOXS), Concepción, Chile
Iván Pérez-Santos
Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile
Centro i-mar, Universidad de los Lagos, Puerto Montt, Chile
Centro de Investigaciones en Ecosistemas de la Patagonia (CIEP), Coyhaique, Chile
Oscar Pizarro
Departamento de Geofísica, Universidad de Concepción, Concepción, Chile
Instituto Milenio de Oceanografía, Concepción, Chile
Centro de Instrumentación Oceanográfica (CIO), Universidad de Concepción, Concepción, Chile
Gonzalo S. Saldías
Departamento de Física, Facultad de Ciencias, Universidad del Bío-Bío, Concepción, Chile
Centro de Investigación Oceanográfica COPAS Coastal, Universidad de Concepción, Concepción, Chile
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Biogeosciences, 22, 4261–4289, https://doi.org/10.5194/bg-22-4261-2025, https://doi.org/10.5194/bg-22-4261-2025, 2025
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Poleward undercurrent eddies (Puddies) transport the source water mass with low oxygen hundreds of kilometers away from the coast. A simulation based on a physical–biogeochemical model was used to characterize the average biogeochemical conditions inside the Puddies during their lifetime while modifying the conditions in the open sea. Our findings show that the biological activity extends the low-oxygen core conditions counteracted by advection processes that tend to ventilate the core.
Cécile Pujol, Alexander Barth, Iván Pérez-Santos, Pamela Muñoz-Linford, and Aida Alvera-Azcárate
EGUsphere, https://doi.org/10.5194/egusphere-2025-1421, https://doi.org/10.5194/egusphere-2025-1421, 2025
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Marine heatwaves and cold spells are periods of extreme sea temperatures. This study focuses on Chilean Northern Patagonia, a fjord region vulnerable due to its aquaculture. It aims to understand these events' distribution and identify the most affected basins. Results show higher intensity in enclosed areas like Reloncaví Sound and Puyuhuapi Fjord. Marine heatwaves are becoming more frequent over time, while cold spells are decreasing.
Manuel Torres-Godoy, Oscar Pizarro, Boris Dewitte, and Vera Oerder
EGUsphere, https://doi.org/10.5194/egusphere-2025-1311, https://doi.org/10.5194/egusphere-2025-1311, 2025
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The Southeast Pacific plays a key role in transporting deep ocean water toward the Southern Ocean through a deep southward flow along the Chilean coast. This study explores its variations and links to El Niño–Southern Oscillation. We found that the deep flow strengthens during El Niño and weakens during La Niña. These changes are tied to large-scale ocean shifts and energy transfers from surface to deep waters. Smaller-scale ocean processes also influence the flow, especially near the coast.
Pedro A. Figueroa, Gonzalo S. Saldías, and Susan E. Allen
Ocean Sci., 21, 643–659, https://doi.org/10.5194/os-21-643-2025, https://doi.org/10.5194/os-21-643-2025, 2025
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Submarine canyons are topographic features found along the continental slope worldwide. Here we use numerical simulations to study how a submarine canyon influences the circulation near the coast when winds moving poleward influence the region. Our results show that submarine canyons modify the circulation near the coast, causing strong velocities perpendicular to the coast. These changes can trap particles inside the canyon, an important mechanism to explain its role as a biological hotspot.
Pilar Aparicio-Rizzo, Dagoberto Poblete-Cballero, Cristian Vera-Bastidas, Iván Pérez-Santos, and Daniel Varela
EGUsphere, https://doi.org/10.5194/egusphere-2024-3951, https://doi.org/10.5194/egusphere-2024-3951, 2025
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This work combines hyperspectral sensors and unmanned aerial vehicles to detect and differentiate microalgal species from optical data on Patagonia fjords at local scale. The results show differences between in situ hyperspectral signals, especially at blue, green, and red to near-infrared spectra, distinguishing between diatoms and dinoflagellates species. These tools are mainly useful in coastal areas where the cloudiness and geographic heterogeneity make satellite data acquisition difficult.
Pamela Linford, Iván Pérez-Santos, Paulina Montero, Patricio A. Díaz, Claudia Aracena, Elías Pinilla, Facundo Barrera, Manuel Castillo, Aida Alvera-Azcárate, Mónica Alvarado, Gabriel Soto, Cécile Pujol, Camila Schwerter, Sara Arenas-Uribe, Pilar Navarro, Guido Mancilla-Gutiérrez, Robinson Altamirano, Javiera San Martín, and Camila Soto-Riquelme
Biogeosciences, 21, 1433–1459, https://doi.org/10.5194/bg-21-1433-2024, https://doi.org/10.5194/bg-21-1433-2024, 2024
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The Patagonian fjords comprise a world region where low-oxygen water and hypoxia conditions are observed. An in situ dataset was used to quantify the mechanism involved in the presence of these conditions in northern Patagonian fjords. Water mass analysis confirmed the contribution of Equatorial Subsurface Water in the advection of the low-oxygen water, and hypoxic conditions occurred when the community respiration rate exceeded the gross primary production.
Julio Salcedo-Castro, Antonio Olita, Freddy Saavedra, Gonzalo S. Saldías, Raúl C. Cruz-Gómez, and Cristian D. De la Torre Martínez
Ocean Sci., 19, 1687–1703, https://doi.org/10.5194/os-19-1687-2023, https://doi.org/10.5194/os-19-1687-2023, 2023
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Considering the relevance and impact of river discharges on the coastal environment, it is necessary to understand the processes associated with river plume dynamics in different regions and at different scales. Modeling studies focused on the eastern Pacific coast under the influence of the Humboldt Current are scarce. Here, we conduct for the first time an interannual modeling study of two river plumes off central Chile and discuss their characteristics.
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Short summary
Submarine canyons are known hotspots of marine productivity and biodiversity, but we do not fully understand why. We studied a submarine canyon located in central Chile and found that it is a highly dynamic environment in both space and time. We think that the alternating currents and the contrasting distribution of zooplankton within the canyon might interact to promote zooplankton retention. Our results help to explain why submarine canyons host such high zooplankton diversity and abundance.
Submarine canyons are known hotspots of marine productivity and biodiversity, but we do not...
