On the variability of tidal fronts on a macrotidal continental shelf, Northern Patagonia, Argentina

Pisoni, Juan Pablo; Rivas, Andrés Luján; Piola, Alberto R.

doi:10.1016/j.dsr2.2014.01.019

Cited by 36 publications

(25 citation statements)

References 45 publications

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“…In the semidiurnal scale predictions of numerical models are a very useful tool to study the variability of the tidal fronts (Simpson, 1998). The model results agree with satellite derived sea surface temperature observations indicating a displacement of some tens of km of the Vald es Front between spring and summer (Pisoni et al, 2014). The variability recorded in the position of the surface thermal front therefore highlights that the surface heat cycle is the dominant forcing on the spatial variability of a typical tidal front in the Patagonian region.…”

Section: Idealized Tidal Frontal Systemsupporting

confidence: 78%

Benthic-pelagic uncoupling between the Northern Patagonian Frontal System and Patagonian scallop beds

Franco

Palma

Tonini

2015

Estuarine, Coastal and Shelf Science

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Section: Idealized Tidal Frontal Systemsupporting

confidence: 78%

Benthic-pelagic uncoupling between the Northern Patagonian Frontal System and Patagonian scallop beds

Franco

Palma

Tonini

2015

Estuarine, Coastal and Shelf Science

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“…In addition, Hopkins and Polton [32] found that the movement of the Liverpool Bay thermohaline front ranged from 5 km to 35 km driven by spring-neap variability in tidal mixing, and the semidiurnal superimposed flood-ebb tidal currents made 5-10 km contributions to the movement. Pisoni, et al [33] showed that position oscillations of about 10 km and 15 km amplitude occurred in the San Matías and Valdés fronts, respectively, in response to the spring-neap transition. In this study, the horizontal displacement of turbidity fronts oscillated approximately 2.1-10.3 km, which are of the same order of magnitude as previous reports of tidal front displacements.…”

Section: Discussionmentioning

confidence: 99%

“…Hopkins and Polton [32] used SST imagery and a regional numerical model to investigate the movement and structure of the thermohaline front in response to spring-neap tidal variability in the Liverpool Bay. In addition, using SST imagery and a one-dimensional model over a macrotidal continental shelf of Northern Patagonia Argentina, Pisoni et al [33] found that the intensity variability of the San Matías and Valdés fronts was modulated by the spring-neap tidal transition. The conventional polar-orbiting satellite imagery, however, makes it difficult to identify high-frequency (e.g., hourly) frontal evolutions, especially in coastal waters.…”

Section: Introductionmentioning

confidence: 99%

Diurnal Variability of Turbidity Fronts Observed by Geostationary Satellite Ocean Color Remote Sensing

Pan

et al. 2016

Remote Sensing

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Abstract:Monitoring front dynamics is essential for studying the ocean's physical and biogeochemical processes. However, the diurnal displacement of fronts remains unclear because of limited in situ observations. Using the hourly satellite imageries from the Geostationary Ocean Color Imager (GOCI) with a spatial resolution of 500 m, we investigated the diurnal displacement of turbidity fronts in both the northern Jiangsu shoal water (NJSW) and the southwestern Korean coastal water (SKCW) in the Yellow Sea (YS). The hourly turbidity fronts were retrieved from the GOCI-derived total suspended matter using the entropy-based algorithm. The results showed that the entropy-based algorithm could provide fine structure and clearly temporal evolution of turbidity fronts. Moreover, the diurnal displacement of turbidity fronts in NJSW can be up to 10.3 km in response to the onshore-offshore movements of tidal currents, much larger than it is in SKCW (around 4.7 km). The discrepancy between NJSW and SKCW are mainly caused by tidal current direction relative to the coastlines. Our results revealed the significant diurnal displacement of turbidity fronts, and highlighted the feasibility of using geostationary ocean color remote sensing technique to monitor the short-term frontal variability, which may contribute to understanding of the sediment dynamics and the coupling physical-biogeochemical processes.

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“…Most studies of marine fronts on the Patagonian shelf have been conducted using satellite images of sea surface temperature (SST) or chlorophyll-a (visible) that only show surface manifestations of fronts (Rivas et al, 2006;Romero et al, 2006;Rivas and Pisoni, 2010;Dogliotti et al, 2014;Pisoni et al, 2015). These studies were also constrained by the availability of images.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Frontal Displacements South of San Jorge Gulf During a Tidal Cycle Near Spring and Neap Phases: Biological Implications Between Tidal States

Carbajal¹,

Rivas²,

Chavanne³

2018

Oceanog

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San Jorge Gulf (SJG) is a region of high biological productivity that supports important shrimp (Pleoticus muelleri) and hake (Merluccius hubbsi) fisheries, as well as high marine biodiversity associated, in part, with a tidal front located in the southern part of the gulf. In situ high-resolution cross-frontal measurements were collected using a remotely operated towed vehicle to characterize the three-dimensional structure of the tidal front and to investigate how its position varies during the semidiurnal tidal cycle (high/low) and the spring to neap transition, together with its impact on the distribution of nutrients and chlorophyll-a. Estimates of tidal height and flow velocity derived from a numerical model support the conclusion that frontal displacements mostly result from advection by cross-frontal tidal currents. The frontal position was also modified by baroclinic instabilities that significantly distort the front. Measurements reveal intrusions of lowsalinity, nutrient-rich waters from the mixed side into the pycnocline on the stratified side cause a subsurface chlorophyll-a peak near the neap phase. Most prior studies of fronts in the SJG have been limited to their surface manifestations because they were conducted using satellite images. This article aims to contribute to the understanding of the complex southern tidal front dynamics, highlighting that maximum primary productivity occurs in a subsurface layer that is not visible by satellite sensors.

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On the variability of tidal fronts on a macrotidal continental shelf, Northern Patagonia, Argentina

Cited by 36 publications

References 45 publications

Benthic-pelagic uncoupling between the Northern Patagonian Frontal System and Patagonian scallop beds

Benthic-pelagic uncoupling between the Northern Patagonian Frontal System and Patagonian scallop beds

Diurnal Variability of Turbidity Fronts Observed by Geostationary Satellite Ocean Color Remote Sensing

High-Frequency Frontal Displacements South of San Jorge Gulf During a Tidal Cycle Near Spring and Neap Phases: Biological Implications Between Tidal States

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