Ezequiel Cozzolino

Instituto Nacional de Investigacion y Desarrollo Pesquero

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Martina Daniela Camiolo

Consejo Nacional de Investigaciones Científicas y Técnicas

Lucrecia Allega

Instituto Nacional de Investigacion y Desarrollo Pesquero

Carlos A. Lasta

Instituto Nacional de Investigacion y Desarrollo Pesquero

Andrés J. Jaureguizar

Comisión de Investigaciones Científicas

Vivian A. Lutz

National University of Mar del Plata

Rut Akselman

Instituto Nacional de Investigacion y Desarrollo Pesquero

Claudia G. Simionato

University of Buenos Aires

Juan P. Pisoni

Consejo Nacional de Investigaciones Científicas y Técnicas

María Constanza Hozbor

Instituto Nacional de Investigacion y Desarrollo Pesquero

María Cintia Piccolo

Universidad Nacional del Sur

Cooperative Institutions

Instituto Nacional de Investigacion y Desarrollo Pesquero

Consejo Nacional de Investigaciones Científicas y Técnicas

National University of Mar del Plata

Fundación Ciencias Exactas y Naturales

Institute of Marine and Coastal Research

University of Buenos Aires

Instituto de Investigacións Mariñas

Institute of Astronomy and Space Physics

Universidad Nacional del Sur

Centro Científico Tecnológico - San Juan

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An empirical remote sensing algorithm for retrieving total suspended matter in a large estuarine region

Scientia Marina (2019)

Martina Daniela Camiolo Ezequiel Cozzolino Ana I. Dogliotti Claudia G. Simionato Carlos A. Lasta

The Río de la Plata is a large, shallow estuary located at approximately 35°S and flowing into the southwestern Atlantic Ocean. It carries a high amount of nutrients and suspended particulate matter, both organic and inorganic, to the adjacent shelf waters and is considered among the most turbid estuarine systems in the world. Knowledge of the concentration and spatial and temporal variability of these materials is critical for any biological study in the Río de la Plata. In this work, the relationship between suspended particulate matter and turbidity is empirically established in order to derive suspended particulate matter maps from satellite data (MODIS-Aqua) for the Río de la Plata region. A strong correlation between suspended particulate matter and turbidity was found (Pearson correlation coefficient =0.91) and the linear regression (slope =0.76 and intercepts =12.78, R2=0.83) explained 83% of the variance. The validation of the empirical algorithm, using co-located and coincident satellite and in situ measurements, showed good results with a low mean absolute error (14.60%) and a small and positive bias (3.04%), indicating that the estimated suspended particulate matter values tend to slightly overestimate the field values.

Turbidity

10.3989/scimar.04847.22a

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Citations (7)

Material Particulado en Suspensión en el Río de la Plata: importancia del río Bermejo en su variabilidad espacio-temporal

Revista de Teledetección (2018)

Martina Daniela Camiolo Ezequiel Cozzolino Andrés J. Jaureguizar

<p>Spatio-temporal variability of Suspended Particulate Matter (SPM) in the Río de la Plata (RdlP) is analyzed from 2002-2014 of MODIS (Moderate Resolution Imaging Spectroradiometer) data and explained in terms of its main tributaries flows. The monthly mean showed maximum during late summer to mid-autumn, and minimum in mid-winter to early summer. The Bermejo river (BeR), is the tributary that more sediment in suspension brings. This situation was reflected in the significant relationship between the mean monthly concentrations of SPM with the average monthly flow of BeR. Seasonal variation in SPM concentration, showed maximum values in fall, followed by summer, and minimum values in winter and spring, reflecting the monthly pattern of discharge of the BeR with one and two months of delay. The pattern of spatial variation differentiated threes regions: the inner, central and outer. The annual variability evidenced a marked seasonality in the spatial coverage pattern of the waters with the highest SPM. The pattern of the anomalies, appeared to be related to the influence of river discharge, what it showed the temporal pattern of SPM anomalies did not related to the ENSO (El Niño – Sourthen Oscillation) cycle. These results allowed us to denote the importance of BeR (not ENSO dependent) to explain the pattern of observed SPM anomaly in the RdlP region.</p>

Seasonality

10.4995/raet.2018.9864

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Comparación de los productos de TSM L3 generados a partir de los sensores AVHRR y MODIS frente al Golfo San Jorge, Argentina

Revista de Teledetección (2017)

Lucrecia Allega Ezequiel Cozzolino Juan P. Pisoni María Cintia Piccolo

<p>Since the early 1980s, the AVHRR sensor on board the NOAA satellites has provided SST estimates to the scientific community in general. Towards the end of the 1990s, a new generation of radiometers was added, combining a wider range of spectral measurements with improvements in technology, such as the MODIS sensor on board the Terra and Aqua satellites. The development of this last sensor was based on the years of NOAA/AVHRR series. Understanding the relationship between products derived from different sensors is critical to the continuous long-term monitoring of any variable and the construction of continuous time series. The objective of this work was to make a comparison of the monthly SST values for the 2003-2006 period calculated from data from the NOAA/ AVHRR series versus Aqua-MODIS on a sector of the middle Argentina Continental shelf off the San Jorge Gulf. For both sensors, the isotherms show a similar distribution pattern in all months. Pearson’s correlation coefficient was high, both in the seasonal (> 0.9) and monthly (> 0.8) analyzes. The comparative analysis of the temperature estimated by both sensors shows that SST products are similar and can be used to analyze large and continuous time series.</p>

Advanced very-high-resolution radiometer

10.4995/raet.2017.7498

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Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations

Revista de biología marina y oceanografía (2014)

Rut Akselman Rubén M. Negri Ezequiel Cozzolino

Resumen.-Los azaspirácidos (AZAs) son toxinas identificadas en invertebrados marinos y tienen amplia distribución geográfica, no reportadas aún en Argentina ni Uruguay.Aunque el primer agente causal identificado es el dinoflagelado fotosintético Azadinium spinosum, diversos estudios indican que otras especies sintetizan asimismo AZAs.Recientemente se ha detectado la presencia de A. cf.spinosum en el Atlántico Sudoccidental y la generación de dos extensas floraciones como nuevos eventos a escala global.En este estudio se analiza la distribución geográfica regional y desarrollo temporal de Azadinium así como las condiciones ecológicas de una tercera floración de A. cf.spinosum y su registro satelital.Azadinium presentó una amplia distribución que abarcó el norte de la plataforma de Argentina y sur de Uruguay, incluyendo la desembocadura del Río de la Plata, con abundancias generalmente bajas (<1x10 3 células L -1 ); un estudio en una estación de serie de tiempo mostró una marcada estacionalidad con mayores abundancias en primavera y otoño.La tercera floración (>10 6 células L -1 ) de A. cf.spinosum ocurrió en agosto-septiembre 1998 en un área coincidente con las previas, en condiciones hidrográficas propicias para su crecimiento poblacional.Esta floración comprobada in situ tuvo registros satelitales del sensor SeaWiFS que indicaron altas concentraciones de clorofila-a (máximo: 11,76 mg Clo-a m -3 ) dentro de una ancha y larga banda (al menos 2,5° de latitud) adyacente al talud continental y la Corriente de Malvinas.Aún desconocemos si las especies de Azadinium presentes en el Atlántico Sudoccidental son capaces de sintetizar AZAs, tema de interés debido a la explotación de bivalvos en bancos de profundidad.

Dinophyceae

Marine invertebrates

10.4067/s0718-19572014000300008

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Citations (15)

Comparison of SST L3 products generated from the AVHRR and MODIS sensors in front of the San Jorge Gulf, Argentina

Revista de Teledetección (2017)

Lucrecia Allega Ezequiel Cozzolino Juan P. Pisoni María Cintia Piccolo

Since the early 1980s, the AVHRR sensor on board the NOAA satellites has provided SST estimates to the scientific community in general. Towards the end of the 1990s, a new generation of radiometers was added, combining a wider range of spectral measurements with improvements in technology, such as the MODIS sensor on board the Terra and Aqua satellites. The development of this last sensor was based on the years of NOAA/AVHRR series. Understanding the relationship between products derived from different sensors is critical to the continuous long-term monitoring of any variable and the construction of continuous time series. The objective of this work was to make a comparison of the monthly SST values for the 2003-2006 period calculated from data from the NOAA/ AVHRR series versus Aqua-MODIS on a sector of the middle Argentina Continental shelf off the San Jorge Gulf. For both sensors, the isotherms show a similar distribution pattern in all months. Pearson’s correlation coefficient was high, both in the seasonal (> 0.9) and monthly (> 0.8) analyzes. The comparative analysis of the temperature estimated by both sensors shows that SST products are similar and can be used to analyze large and continuous time series.

Advanced very-high-resolution radiometer

SeaWiFS

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The variability of sea surface temperature in the Patagonian Shelf Argentina, from 35 years of satellite information

International Journal of Remote Sensing (2021)

Lucrecia Allega Juan P. Pisoni Ezequiel Cozzolino Reinaldo A. Maenza María Cintia Piccolo

The aim of the present work is to analyse the variations of Sea Surface Temperature (SST) and Anomaly of Sea Surface Temperature (ASST) using more than thirty years of satellite data. We studied if these variations have possible ocean-atmosphere connections with the Southern Annular Mode (SAM), the Southern Oscillation Index (SOI), and the Oceanic Niño Index (ONI) in a crucial region for fisheries off the Patagonian Shelf. For the analysis, we used SST data collected from 1985 to 2019 with Advanced Very High Resolution Radiometer (AVHRR) and Moderate Resolution Imaging Spectroradiometer (MODIS) instruments. The two databases were merged to obtain 35 years of continuous SST data. The study area was divided into three zones to present different oceanographic and bathymetric characteristics. These zones are located in the gulf, in the middle of the continental shelf, and at the shelf break. For each of the zones, the monthly SST climatology and the ASST series are shown. To define their periodicity, monthly ASST data were analysed spectrally by Fast Fourier Transform (FFT) and Wavelet Transform. Cross-Wavelet Transform (XWT) was applied to analyse the co-variance of ASST with respect to climate indices. Our results show that the isotherm distribution seems to be separated by the 64º W meridian. To the east of 64º W, it follows an oblique direction from southwest to northeast; to the west of 64º W, a more complex behaviour of the SST field seems to be associated with the coastal dynamics. The ASST series shows that the values of negative anomalies are higher than those of the positive ones. Nevertheless, positive ASSTs are more extreme and persistent in time than the negative ones. The ASST wavelet diagrams denote a common and non-stationary periodicity in the three zones, with statistically significant power spectra in the intra-seasonal (9-month) and inter-annual (24-month and 4-year) time scales. There are clearly common features in the wavelet power of the time series related to ASST and climate forcing. The SAM exhibited the closest relationship with ASST in the three zones. The SAM and ASST indices denote significant power peaks in the 2-year and 4- to 6-year bands.

10.1080/01431161.2021.1934600

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Citations (10)

Azadinium (Amphidomataceae, Dinophyceae) in the Southwest Atlantic: In situ and satellite observations Azadinium (Amphidomataceae, Dinophyceae) en el Atlántico Sudoccidental: Observaciones in situ y satelitales

Rut Akselman Rubén M. Negri Ezequiel Cozzolino

Palabras clave: Azadinium, floraciones de dinoflagelados, Atlantico Sudoccidental, SeaWiFS Abstract.- Azaspiracid toxins (AZAs) have been identified in marine invertebrates and are of wide geographical distribution, but have not been reported in Argentina or Uruguay. The first identified causal agent is the photosynthetic dinoflagellate Azadinium spinosum, but new studies indicate that other species also synthesize AZAs. We have recently reported the presence of A. cf. spinosum in the Southwest Atlantic and the generation of two extended blooms as new global events. Here we analyze the ecological conditions of a third bloom of A. cf. spinosum and its satellite record, and report the regional distribution and temporal development of the genus Azadinium. Azadinium had a wide spatial distribution encompassing northern Argentine and southern Uruguayan shelves, including the mouth of the Rio de la Plata. Abundance was generally low ( 10 6 cells L -1 ) in August-September 1998 in the northern shelf of Argentina in an area that spatially coincided with the previous episodes, with hydrographic conditions propitious for its population growth. This bloom analyzed in situ, had satellite records from the SeaWiFS sensor which indicated high concentrations of chlorophyll-a (maximum of 11.76 mg Chlo-a m -3 ) in a long and wide band (at least 2.5° latitude) near the continental shelf break and the Malvinas Current. It is still unknown if species of Azadinium are capable of synthesizing AZAs, a topic of interest in this region due to commercial bivalve exploitation.

Dinophyceae

SeaWiFS

Bloom

Dinoflagellate

Red tide

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Influencia del ambiente en la composición interanual de los ensambles de clases de talla de Micropogonias furnieri, especie de interés comercial

Revista española de estudios agrosociales y pesqueros/Revista española de estudios agrosociales y pesqueros (2019)

Martina Daniela Camiolo Ezequiel Cozzolino Claudia Carozza Andrés J. Jaureguizar

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Primary production and plankton assemblages in the fisheries ground around San Jorge Gulf (Patagonia) during spring and summer

Plankton and Benthos Research (2021)

Valeria Segura Ricardo I. Silva Moira Luz Clara Patricia Martos Ezequiel Cozzolino

The San Jorge Gulf, and the littoral to its north, is one of the most important fishing grounds for Argentina. Nevertheless, phytoplankton production has been scarcely studied. Here we analyzed during spring (2008) and summer (2009) the phytoplankton biomass, production, and the composition of phytoplankton and protozooplankton; their possible trophic relationships, and physical conditioners. At the south coast of the gulf during spring micro-nano-plankton (diatoms and dinoflagellates) were predominant and responsible for the maximum integrated production, comparable to that reported for the rich Argentinian shelf-break. Part of the organic carbon produced there was consumed by heterotrophic dinoflagellates, adding a trophic level to the food web. While at the center of the gulf, a conspicuous deep chlorophyll maximum would probably add organic matter to the bottom. During the following summer (2009), the ultra-fraction represented the largest contribution to total phytoplankton biomass, and was dominated by Synechococcus sp. This, plus the abundance of ciliates, indicate the prevalence of a microbial food web during summer. It has been found that the frontal zones in the north and south of the gulf, favoring high phytoplankton biomass and its maintenance due to high primary production, provide a favorable food environment for impregnated female shrimp in spring, and for larvae during summer.

Microbial food web

Spring bloom

10.3800/pbr.16.24

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Citations (6)

Regulation of CO2 by the sea in areas around Latin America in a context of climate change

Environmental Monitoring and Assessment (2023)

Vivian A. Lutz M. Chidiak Robert Frouin RM Negri Ana I. Dogliotti

10.1007/s10661-023-10997-1

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Citations (1)