Internal solitary waves from L-band SAR over the Argentine inner Patagonian shelf

Pisoni, Juan Pablo; Glembocki, Nora Gabriela; Romero, Sílvia I.; Tonini, Mariano Hernan

doi:10.1080/2150704x.2020.1736725

Cited by 7 publications

(8 citation statements)

References 23 publications

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“…It is one of the most relevant areas of the Argentine coast in terms of biodiversity and productivity [37,38,57,58] and currently a management plan is being developed in it, involving government and scientific staff. The region encompasses a shallow ecosystem unit of the inner Patagonian Shelf in the Southwestern Atlantic Ocean, an area with depths up to 90 m [59] and including several coastal islands, headlands, and steep slopes, about which detailed information is lacking [36]. It is influenced by the North Patagonian Frontal System which is forced by seasonal thermal stratification and high energy dissipation of semi-diurnal tides.…”

Section: Study Areamentioning

confidence: 99%

“…Despite the numerous studies on its coastal environments, few studies have analyzed submesoscale processes, mostly of them located in the Patagonian Sea. These regional studies demonstrate that irregular bottom topography, together with unusually large tidal amplitudes and wind stress, condition the vertical structure and generate eddies, gyres, and jets through vorticity [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…Because of its ecological relevance and high dynamism, this area has been previously studied from different perspectives: seabirds and marine mammals communities [37,[39][40][41], bottom characterization (Sánchez-Carnero et al, 2020 [42]), biological and chemical oceanography [43][44][45][46][47][48], physical oceanography [45,[49][50][51], even submesoscale processes characterization [32,36]. However, due to its large size, no systematic study of the submesoscale processes of the entire protected area of the northern San Jorge Gulf has been carried out so far.…”

Section: Introductionmentioning

confidence: 99%

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Using Landsat Image Series to Identify and Characterize Persistent Oceanographic Structures in a Dynamic Marine Protected Area (North of San Jorge Gulf, Argentinian Patagonia)

et al. 2023

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Coastal oceanographic processes, like up- and downwelling, topographic fronts, etc., have consequences in biological communities. In some cases, these processes show up as surface structures observable in satellite imagery at different scales. In this work, we focus on the persistent structures observed in the coastal marine protected area of Parque Interjurisdiccional Marino-Costero Patagonia Austral (PIMCPA), one of the most relevant areas of the Argentine coast in terms of biodiversity and productivity. Using 80 Landsat-8 30 m-resolution images from the years 2017–2021, more than 20 structures were identified in the PIMCPA that appear consistently across seasons in approximately the same areas. We focus on four of them, those that are persistent and of medium scale, whose dimensions do not extend in most cases more than 10 km from their region of generation, and describe their location and shape in detail, and analyze their dependence on forcing variables such as tides, wind, bathymetry, and seasonality. Tidal currents prove to be the most significant variable in the formation and evolution of the structures described, above wind or seasonal stratification, which play only a secondary role.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using Landsat Image Series to Identify and Characterize Persistent Oceanographic Structures in a Dynamic Marine Protected Area (North of San Jorge Gulf, Argentinian Patagonia)

et al. 2023

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“…In [8], using ERS-1/2, Envisat-1, and Sentinel-1A/B SAR images, Wang et al obtained over 500 sets of internal wave packets, discussed the spatial and temporal distribution characteristics of ISWs in the Georgia Strait, and analyzed the relationships between ISWs and tidal and wind fields. In [9], Pisoni et al used Advanced Land Observing Satellite (ALOS) Phase Array type L-band SAR (PALSAR) images to study ISWs on the Argentine inner Patagonian shelf and evaluated their generation mechanism and propagation speed. In [10], Nadimpalli et al used Envisat and TerraSAR-X images to study the potential generation locations of ISWs in the Andaman Sea.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Internal Solitary Wave Detection and Identification Based on Compact Polarimetric SAR

et al. 2020

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This paper studies the application of compact polarimetric (CP) SAR in the detection and identification of ocean internal solitary waves (ISWs). First, based on full-polarimetric ALOS PALSAR images, we construct CP SAR images and extract 26 CP features. Then, the ISWS-sea surface differentiation capability for the different polarization features is analyzed by using the Jeffries and Euclidean distances. The results show that 1  , Entropy (H), Lambda, the polarimetric total power (Span) and the Stokes parameters (Stokesg0, and Stokesg3) improve the ISWs detection results. On this basis, a kmeans clustering algorithm based on CP features is introduced, and the results show that the ISWs detection and identification performance of the algorithm are superior to that of the traditional Wishart polarization clustering algorithm, which suggests that CP SAR has good application prospects in the detection and identification of ocean ISWs.

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“…After that, the most important current components that produced greatest variations of syzygy and quadrature (M2, S2 and N2) in the region were taken, with phase-adjustment using the free-to-use global xtide model (https://flaterco.com). From this, U and V components were assembled (cf Pisoni et al 2020)…”

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confidence: 99%

Circles within spirals, wheels within wheels; Body rotation facilitates critical insights into animal behavioural ecology

Gunner¹

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How animals behave is fundamental to enhancing their lifetime fitness, so defining how animals move in space and time relates to many ecological questions, including resource selection, activity budgets and animal movement networks. Historically, animal behaviour and movement has been defined by direct observation, however recent advancements in biotelemetry have revolutionised how we now assess behaviour, particularly allowing animals to be monitored when they cannot be seen. Studies now pair ‘convectional’ radio telemetries with motion sensors to facilitate more detailed investigations of animal space-use. Motion sensitive tags (containing e.g., accelerometers and magnetometers) provide precise data on body movements which characterise behaviour, and this has been exemplified in extensive studies using accelerometery data, which has been linked to space-use defined by GPS. Conversely, consideration of body rotation (particularly change in yaw) is virtually absent within the biologging literature, even though various scales of yaw rotation can reveal important patterns in behaviour and movement, with animal heading being a fundamental component characterising space-use. This thesis explores animal body angles, particularly about the yaw axis, for elucidating animal movement ecology. I used five model species (a reptile, a mammal and three birds) to demonstrate the value of assessing body rotation for investigating fine-scale movement-specific behaviours. As part of this, I advanced the ‘dead-reckoning’ method, where fine-scale animal movement between temporally poorly resolved GPS fixes can be deduced using heading vectors and speed. I addressed many issues with this protocol, highlighting errors and potential solutions but was able to show how this approach leads to insights into many difficult-to-study animal behaviours. These ranged from elucidating how and where lions cross supposedly impermeable man-made barriers to examining how penguins react to tidal currents and then navigate their way to their nests far from the sea in colonies enclosed within thick vegetation.

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Internal solitary waves from L-band SAR over the Argentine inner Patagonian shelf

Cited by 7 publications

References 23 publications

Using Landsat Image Series to Identify and Characterize Persistent Oceanographic Structures in a Dynamic Marine Protected Area (North of San Jorge Gulf, Argentinian Patagonia)

Using Landsat Image Series to Identify and Characterize Persistent Oceanographic Structures in a Dynamic Marine Protected Area (North of San Jorge Gulf, Argentinian Patagonia)

Performance Analysis of Internal Solitary Wave Detection and Identification Based on Compact Polarimetric SAR

Circles within spirals, wheels within wheels; Body rotation facilitates critical insights into animal behavioural ecology

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