Identification, characteristics and seasonal evolution of surface thermal fronts in the Argentinean Continental Shelf

Rivas, Andrés Luján; Pisoni, Juan Pablo

doi:10.1016/j.jmarsys.2009.07.008

Cited by 77 publications

(60 citation statements)

References 28 publications

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“…In addition, there are smaller local frontal systems in deeper bays and gulfs along the arid Patagonian coastline. These front systems result from isolated waters that are formed by interplay of high evaporation during summer, the shelf current systems and riverine inputs (Acha et al, 2004;Rivas and Pisoni, 2010). Current circulation suggests that tides, wind and bottom topography, for instance the ridge at the mouth of the San Jorge Gulf (SJG), are the main local forcing mechanisms in the Patagonian gulfs (Tonini et al, 2006;Palma et al, 2008;Matano et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Krock

Borel

Barrera

et al. 2015

Journal of Marine Systems

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The overlay of cooler nutrient enriched Beagle-Magellan water with warmer nutrient depleted shelf water and a strong stratification of the water column in the San Jorge Gulf region, Argentina, coincided with relatively high dinoflagellate abundances in April 2012, up to 34,000 cells L −1 . This dinoflagellate proliferation was dominated by Ceratium spp., but environmental conditions also favored to a lesser amount the occurrence of toxigenic dinoflagellates, such as Alexandrium tamarense and Protoceratium reticulatum, whose toxins were hardly detected in any other areas along the expedition transect of the R/V Puerto Deseado between 38 and 56°S (Ushuaia-Mar del Plata) in March/April 2012. Generally vegetative cells of A. tamarense and P. reticulatum co-occurred with their respective phycotoxins in the water column and their cysts in the upper sediment layers. Two strains of A. tamarense were isolated from the bloom sample and morphologically characterized. Their PSP toxin profiles consisted of C1/2, gonyautoxins 1/4 and to a lesser amount of neosaxitoxin and confirmed earlier data from this region. The ratios between autotrophic picoplankton and heterotrophic bacteria were higher in shelf waters in the north than in Beagle-Magellan waters in the south of San Jorge Gulf.

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Section: Introductionmentioning

confidence: 99%

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Krock

Borel

Barrera

et al. 2015

Journal of Marine Systems

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“…Marrari et al [3] reported that the availability of adequate food (high presence of phytoplankton and zooplankton), suitable thermal and salinity ranges, the presence of marine fronts [1,4], and the oceanic circulation that favors a retention mechanism, produce an appropriate environment for successful larval fish development. Therefore, the physical and biological characteristics of the El Rincón area generate a rich habitat of valuable commercial species, which are very important for the local artisanal fisheries [5].…”

Section: Introductionmentioning

confidence: 99%

“…The existence of a salinity and a thermal front in the study area are generated by bathymetry changes and dilution effects, combined with the northern advection of San Matí as Gulf waters, particularly in winter [2,4] (Figure 1c). These waters are characterized by high salinity values due to the dominance of evaporation over the precipitation in the water balance of the Gulf [2].…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

et al. 2015

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Abstract:The aim of this study is to describe and understand the seasonal and inter-annual physical and biological dynamics of the inner and mid shelves of the Southwestern Buenos Aires Province (Argentina). We used chlorophyll-a (chl-a) concentrations and inherent optical properties (IOPs), derived from ocean color products between 2002 and 2010, as a proxy for the physical and biological parameters of interest. This study focuses on the absorption by phytoplankton, aph(443), particulate backscattering, bbp(443), and absorption due to dissolved and particulate detrital matter, adg (443), and chl-a derived from a multiband quasi-analytical algorithm (QAA). A regionalization based on the coefficient of variation and the Census X-11 method were applied to define regions and to analyze the inter-annual and seasonal variability of the ocean color parameters, with regards to climate OPEN ACCESSRemote Sens. 2015, 7 11822 variability. The coastal zone presents the highest values of chl-a with two maxima in winter and autumn, while the mid-shelf shows a strong spring chl-a maximum. After 2009, all parameters under study shifted their seasonality and their magnitude changed over the entire area. In the coastal zone, mean values of aph(443) and bbp(443) increased, while in the mid-shelf, chl-a and aph(443) decreased. The observed inter-annual and seasonal behavior of the parameters is tightly related to climate variability of the study area.

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“…This is widely used to define the physical environment, and impacts the variability of marine ecosystems [1,2], and is designated an Essential Climate Variable. Water masses defined by marine thermal fronts are often denoted by using SST gradient fields as a proxy, thus identifying regions of optimal conditions for growth of marine phytoplankton (nutrients, light, mixing, and upwelling) and, in many cases, enhanced trophic levels of productivity [3][4][5][6][7]. The spatial and temporal patterns in SST fields are a key characteristic of fisheries ecosystems, having implications for sustainable management [8,9].…”

Section: Introductionmentioning

confidence: 99%

Sea Surface Temperature Retrieval from MODIS Radiances Using Truncated Total Least Squares with Multiple Channels and Parameters

Koner

Harris

2016

Remote Sensing

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Global sea-surface temperatures (SST) from MODIS measured brightness temperatures generated using the regression methods, have been available to users for more than a decade, and are used extensively for a wide range of atmospheric and oceanic studies. However, as evidenced by a number of studies, there are indications that the retrieval quality and cloud detection are somewhat sub-optimal. To improve the performance of both of these aspects, we endorse a new physical deterministic algorithm, based on truncated total least squares (TTLS), using multiple channels and parameters, in conjunction with a hybrid cloud detection scheme using a radiative transfer model atop a functional spectral difference method. The TTLS method is a new addition that improves the information content of the retrieval compared to our previous work using modified total least squares (MTLS), which is feasible because more measurements are available, allowing a larger retrieval vector. A systematic study is conducted to ascertain the appropriate channel selection for SST retrieval from the 16 thermal infrared channels available from the MODIS instrument. Additionally, since atmospheric aerosol is a well-known source of degraded quality of SST retrieval, we include aerosol profiles from numerical weather prediction in the forward simulation and include the total column density of all aerosols in the retrieval vector of our deterministic inverse method. We used a slightly modified version of our earlier reported cloud detection algorithm, namely CEM (cloud and error mask), for this study. Time series analysis of more than a million match-ups shows that our new algorithm (TTLS+CEM) can reduce RMSE by~50% while increasing data coverage by~50% compared to the operationally available MODIS SST.

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Identification, characteristics and seasonal evolution of surface thermal fronts in the Argentinean Continental Shelf

Cited by 77 publications

References 28 publications

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Analysis of the hydrographic conditions and cyst beds in the San Jorge Gulf, Argentina, that favor dinoflagellate population development including toxigenic species and their toxins

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

Sea Surface Temperature Retrieval from MODIS Radiances Using Truncated Total Least Squares with Multiple Channels and Parameters

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