Jacobo Martín

University of Barcelona | UB · Departament de dinàmica de la terra i l'oceà

The northwestern Mediterranean is known to be a privileged area of deep water formation via dense shelf water cascading and offshore convection. The impact of the former in the sedimentary dynamics of the deep basin has been highlighted in recent years, while open sea convection has been solely studied from a hydrological perspective. Particle flux...

To study the temporal and spatial variability of downward particle fluxes in the Palamós submarine canyon, seven sediment traps were moored inside and in the vicinity of the canyon from March to November 2001. Total mass fluxes, major constituent (organic carbon, opal, calcium carbonate and lithogenics) contents and fluxes, and 210Pb activity of pa...

Cap de Creus Canyon (CCC) is known as a preferential conduit for particulate matter leaving the Gulf of Lion continental shelf towards the slope and the deep basin, particularly in winter when storms and dense shelf water cascading coalesce to enhance the seaward export of shelf waters. During the CASCADE (CAscading, Storm, Convection, Advection an...

The Beagle Channel (BC) is a long and narrow interoceanic passage (∼270 km long and 1–12 km wide) with west-east orientation and complex bathymetry connecting the Pacific and Atlantic oceans at latitude 55°S. This study is the first integrated assessment of the main oceanographic features of the BC, using recent oceanographic observations from crui...

Climate projections for the end of the century predict changes in the mean and also the variability of physical parameters critical to marine ecosystems, in particular at high latitudes. Here, we aimed to study the natural variability of major components of the pelagic ecosystem along a subantarctic zonal transect (~55° S) from coastal waters of th...

The squat lobster Munida gregaria is an ecologically relevant species in southern South American waters. Nonetheless, fundamental topics regarding its larval ecology remain poorly studied, especially at the southern limit of its distribution area. Here, we investigated the abundance, size, and spatial distribution of M. gregaria larval stages (zoea...

The Beagle Channel is a long and narrow interoceanic passage within the Tierra del Fuego archipelago in the southernmost tip of South America. A high-resolution 3D hydrodynamic model based on the finite elements method was applied to investigate the residual circulation, water fluxes and transport time scales inside this channel. Numerical solution...

The Beagle Channel (BC) is a sub-Antarctic coastal marine environment (~54.5ºS) that connects the Pacific and Atlantic oceans and is influenced by runoff, wind and seasonal mixing. Along its 300 km length, the BC has hydrological sub-basins (SC) separated from each other by bathymetric barriers. The object of this study focuses on the internal SC (...

The Beagle Channel (BC) is an inter-oceanic passage shared by Argentina and Chile that connects the Pacific Ocean and the Atlantic Ocean and has contrasting hydrological sub-basins along its 300 km length. This system is influenced by the inflow of sub-Antarctic waters that mix with continental contributions from glaciers and fluvial discharges, ha...

Since the impacts of climate change on marine benthic organisms are already detectable in many aspects, it is crucial to address the potential responses of marine organisms and their interactions with the environment. In particular, the study of phenotype traits along latitudinal gradients is a powerful tool for exploring species responses in a cha...

The Patagonian shelf is one of the most productive and dynamic continental shelves of the world. Changes in the environmental conditions affect productivity, species population sizes, and community structure within the coastal ocean ecosystem. In this chapter, the baseline knowledge of the physical processes and the observed and expected changes th...

Category Scientific Program Abstract > Special Sessions > SS80 Dynamics of organic matter in the river-ocean continuum: From analytical methods, molecular and isotope geochemistry, to ecosystem modelling Preference: Oral

The MALINA oceanographic campaign was conducted during summer 2009 to investigate the carbon stocks and the processes controlling the carbon fluxes in the Mackenzie River estuary and the Beaufort Sea. During the campaign, an extensive suite of physical, chemical and biological variables were measured across seven shelf–basin transects (south–north)...

A coupled ocean-wave model was used to investigate residence times of the water masses on the Gulf of Lion shelf and their export routes during autumn 2010 and winter 2010–2011. Particular attention is paid to the Cap de Creus region and submarine canyon, a key site for the export of water from the Gulf of Lion shelf. First, model results were comp...

The sub-Antarctic Namuncurá Marine Protected Area at Burdwood Bank (NMPA/BB) is an area of favorable conditions for the development of planktonic organisms and the sustenance of numerous species of ecological importance. The current study aimed to evaluate the spatial distribution of the abundance, biomass, community structure, and functional diver...

This dataset, gathered during the RETRO-BMC cruise, reports multiple-scale measurements at the Confluence of the Brazil and Malvinas Currents. The cruise was carried out between 8 and 28 April 2017 onboard R/V Hespérides, departing from Ushuaia and arriving to Santos. Along its track, the vessel recorded near-surface temperature and salinity, as we...

Continental dust can be suspended and transported by the wind, reaching seawater masses far away from its source. The deposition of the aerosols on the ocean surface can alter the abundance of chemical species in the water column and contribute to element inventories in seafloor sediments. A major Saharan dust intrusion into the Western Mediterrane...

This study examines the distribution and seasonal evolution of hydrographic, hydrodynamic, and nepheloid layers in Ushuaia Bay and the submerged glacial valley that connects it to the Beagle Channel. The hydrographic structure is highly seasonal, with a total mixing of the water column in winter and the appearance of a pycnocline between 50 and 70...

This study examines the distribution and seasonal evolution of hydrographic, hydrodynamic, and nepheloid layers in Ushuaia Bay and the submerged glacial valley that connects it to the Beagle Channel. The hydrographic structure is highly seasonal, with a total mixing of the water column in winter and the appearance of a pycnocline between 50 and 70...

In February 2004, anthropogenic radionuclides (137Cs, 236U, 239Pu and 240Pu), transported from the Sahara Desert, were observed in the Monaco air, and later in water and sediment samples collected at the DYFAMED site in the northwest (NW) Mediterranean Sea. While 236U and 137Cs in Saharan dust particles showed a high solubility in seawater, Pu isot...

The Beagle Channel is a subantarctic passage connecting the Pacific and Atlantic oceans, and where mixing processes between oceanic and continental waters and strong land-to-sea exchanges of water and particulate matter are taking place. A collection of hydrographic, hydrodynamic and nephelometric observations is presented in this work to advance...

In the sub-Antarctic waters of southern South America, two species that form conspicuous pelagic aggregations are considered both potential fshery resources and ecologically important: the Fuegian sprat Sprattus fuegensis and the squat lobster Munida gregaria. Here, we estimate spatio-temporal patterns of the relative abundance, distribution and po...

The Patagonian sprat Sprattus fuegensis is a species of ecological importance in the Southwest Atlantic Ocean. However, information regarding S. fuegensis in the Namuncurá Marine Protected Area–Burdwood Bank (NMPA–BB), an open sea Sub-Antarctic Marine Protected Area located in the Argentinian shelf, is outdated and fragmented. Understanding the dyn...

The Beagle Channel and in particular Ushuaia Bay, are subantarctic environments where mixing processes between oceanic and continental waters, and strong land-to-sea exchanges of water and particulate matter are taking place. Multiple sources of particulate matter to the channel can be identified: glaciers, rivers, direct runoff from forests along...

El Canal Beagle (CB) es un ambiente marino costero austral complejo, que conecta los océanos Pacífico y Atlántico, y que recibe en su recorrido importantes aportes terrígenos por parte de las cadenas montañosas de los Andes Fueguinos y otros aportes de materia orgánica de origen antrópico por parte de la ciudad de Ushuaia. Entre los días 27 a 31 de...

El Canal Beagle (CB) es un ambiente marino costero austral complejo, que conecta los océanos Pacífico y Atlántico, y que recibe en su recorrido importantes aportes terrígenos por parte de las cadenas montañosas de los Andes Fueguinos y otros aportes de materia orgánica de origen antrópico por parte de la ciudad de Ushuaia. Entre los días 27 a 31 de...

30 de julio al 3 de agosto de 2018 - FCEyN - UBA - BUENOS AIRES

RESUMEN Los cañones submarinos son los mayores rasgos erosivos de los márgenes continen­ tales tanto activos como pasivos. Desde los albores del siglo XX, representan un fructífero tema de debate e investigación por su gran relevancia como agentes de transferencia de sedimento y materia orgánica de continente a océano, por ser lugar de surgencia de...

In this contribution we provide the first images of the submarine landscape of the Namuncurá Marine Protected Area, Burdwood Bank, at the SW Atlantic Ocean. This non-invasive approach revealed and offered a complementary view of the seafloor and its fauna, only previously reported from trawl catches.

This Article contains an error in Figure 3, where the sedimentation rate from Besòs-3 '0.078 cm/y' is incorrectly given as '0.39 cm/y'. The correct Figure 3 appears below as Figure 1. (Figure Presented).

Unlike the major anthropogenic changes that terrestrial and coastal habitats underwent during the last centuries such as deforestation, river engineering, agricultural practices or urbanism, those occurring underwater are veiled from our eyes and have continued nearly unnoticed. Only recent advances in remote sensing and deep marine sampling techno...

Unlike the major anthropogenic changes that terrestrial and coastal habitats underwent during the last centuries such as deforestation, river engineering, agricultural practices or urbanism, those occurring underwater are veiled from our eyes and have continued nearly unnoticed. Only recent advances in remote sensing and deep marine sampling techno...

El Área Marina Protegida (AMP) Namuncurá fue creada en el año 2013 a través de la Ley N°26.875 y se ubica en la región conocida como Banco Burdwood, una meseta submarina localizada a 200 km al sur de las Islas Malvinas y a 150 km al este de Isla de los Estados. Se trata de una región de características únicas dentro del Mar Argentino, que alberga u...

Bottom trawling leads to recurrent sediment resuspension events over fishing grounds. Recent studies have shown how bottom trawling can drive seascape reshaping at large spatial scales and enhance sediment transport in submarine canyons, which subsequently impacts deep-sea ecosystems. Present knowledge on the transfer and accumulation of sediment f...

Many studies highlight that fish trawling activities cause seafloor erosion, but the assessment of the remobilization of surface sediments and its relocation is still not well documented. These impacts were examined along the flanks and axes of three headless submarine canyons incised on the Barcelona continental margin, where trawling fleets have...

Submarine canyons are major geomorphic features of continental margins around the world. Several recent multidisciplinary projects focused on the study of canyons have considerably increased our understanding of their ecological role, the goods, and services they provide to human populations, and the impacts that human activities have on their over...

Se presentan en este trabajo datos de oxígeno disuelto junto con parámetros de contexto (temperatura, salinidad, clorofila, concentración de sólidos en suspensión) en Bahía Ushuaia y zonas adyacentes del Canal Beagle. El muestreo incluyó el perfilado de la columna de agua y análisis de agua simultáneos con alta resolución espacio-temporal durante d...

Se presentan en este trabajo resultados de un estudio de distribución espacio-temporal de oxígeno disuelto como posible indicador de calidad ambiental en las aguas del Canal Beagle, con particular énfasis en Bahía Ushuaia como punto de intersección de procesos naturales pre-industriales y perturbaciones recientes de origen antrópico. Perfiles vert...

El Canal Beagle es un pasaje interoceánico conectando los Océanos Pacifico y Atlántico en el extremo sur de Sudamérica, donde confluyen intensos procesos de mezcla entre aguas marinas y continentales y una creciente presión antrópica. Desde julio 2014 se caracterizó la variabilidad estacional y espacial de las estructuras termohalinas en el Canal B...

The process of resuspension by bottom trawling leads to recurrent transfer of sediment from shallower to deeper areas, and occurs practically worldwide. Recent studies have shown the importance of trawling as a driver of sediment transfer in canyons. Our aim is to assess trawling impact on sediment dynamics in La Fonera submarine canyon (NW Mediter...

Previous studies conducted in La Fonera (Palamós) submarine canyon (NW Mediterranean) found that trawling activities along the canyon flanks cause resuspension and transport of sediments toward the canyon axis. 210Pb chronology supported by 137Cs dating applied to a sediment core collected at 1750 m in 2002 suggested a doubling of the sediment accu...

As part of the international, multidisciplinary project Malina, downward particle fluxes were investigated by means of a drifting multi-sediment trap mooring deployed at three sites in the Canadian Beaufort Sea in late summer 2009. Mooring deployments lasted between 28 and 50 h and targeted the shelf-break and the slope along the Beaufort-Mackenzie...

Bottom-trawling is one of the anthropogenic activities with a stronger and more widespread impact on the seafloor. Physical processes involved in sediment resuspension due to trawling and the resulting sediment-laden flows are not fully understood. The amount and fate of remobilized sediments are of the utmost relevance for establishing present-day...

Fishing gear and techniques, originally devised to collect limited amounts of fish and shellfish for the nourishment of small human communities, have evolved through the centuries, and particularly after the Second World War, towards a mass production industry in such a scale that it has placed many commercial stocks in a delicate or depleted statu...

As part of the international, multidisciplinary project Malina, downward particle fluxes were investigated by means of a drifting multi-sediment trap mooring deployed at three sites in the Canadian Beaufort Sea in late summer 2009. Mooring deployments lasted for 28–50 h and targeted the shelf-break and the slope along the Beaufort–Mackenzie contine...

The offshore displacement of commercial bottom trawling has raised concerns about the impact of this destructive fishing practice on the deep seafloor, which is in general characterized by lower resilience than shallow water regions. This study focuses on the flanks of La Fonera (or Palamós) submarine canyon in the Northwestern Mediterranean, where...

Submarine landslides on continental slopes are triggered by diverse mechanisms such as sea-level variations, climate-driven sediment supply fluctu-ations, slope steepening related to long term tectonics, earthquakes and human activities. In the present work, we try to discriminate the origin of major gravity events recorded in three sediment cores...

Significance Deep-sea ecosystem processes play a key role in global functioning of the planet. These functions are largely dependent upon deep-sea biodiversity. Industrial fisheries, after the depletion of fish stocks and destruction of the marine habitats on continental shelves, are now rapidly moving deeper into the ocean interior. We show here t...

A monitoring effort to address the physical effects of bottom trawling was conducted on the Ebro prodeltaic mud belt during the RESPONSE project. The monitoring was carried out for 14 months covering periods of different trawling intensities and a close season for the trawling fleet. The seabed morphology was studied by side-scan sonar and sediment...

Deep-sea ecosystems are in general adapted to a limited variability of physical conditions, resulting in high vulnerability and slow recovery rates from anthropogenic perturbations such as bottom trawling. Commercial trawling is the most recurrent and pervasive of human impacts on the deep-sea floor, but studies on its consequences on the biogeoche...

Submarine landslides on continental slopes are triggered by diverse mecha-nisms such as sea-level variations, climate-driven sediment supply fluctuations, slope steepening related to long term tectonics, earthquakes and human activities. In the present work, we try to discriminate the origin of major gravity events recorded in three sediment cores...

It has been a year since our last WP3 newsletter, and a large research effort on the “Land‐Ocean interaction including extreme events” has been going on since then. In this letter, we present the results from two ongoing projects: CASCADE and C3A. The main cruise of CASCADE (Cascading, Storm, Convection, Advection, and Downwelling Events) was condu...

Submarine canyons are morphological incisions into continental margins that act as major conduits of sediment from shallow- to deep-sea regions. However, the exact mechanisms involved in sediment transfer within submarine canyons are still a subject of investigation. Several studies have provided direct information about contemporary sedimentary pr...

Particle fluxes (including major components and grain size), and oceanographic parameters (near-bottom water temperature, current speed and suspended sediment concentration) were measured along the Cap de Creus submarine canyon in the Gulf of Lions (GoL; NW Mediterranean Sea) during two consecutive winter-spring periods (2009–2010 and 2010–2011). T...

Molecular lipid biomarkers (hydrocarbons, alcohols, sterols and fatty acids) and compound-specific isotope analysis of suspended particulate organic matter (SPM) and surface sediments of the Mackenzie Shelf and slope (southeast Beaufort Sea, Arctic Ocean) were studied in summer 2009. The concentrations of the molecular lipid markers, characteristic...

A better understanding of how environmental changes affect organic matter fluxes in Arctic marine ecosystems is sorely needed. Here we combine mooring times series, ship-based measurements and remote sensing to assess the variability and forcing factors of vertical fluxes of particulate organic carbon (POC) across the Mackenzie Shelf in 2009. We de...