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Absence of the annual cycle in shelf current inshore of the East Indian Coastal Current Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-20 Biswamoy Paul; Balaji Baduru; Arya Paul; P.A. Francis; Satish R. Shetye
A ubiquitous feature of the winds over the North Indian Ocean (NIO), which are dominated by monsoons, is the occurrence of variability with the annual period. It is equally pervasive in the ocean's wind-driven circulation. Here we report observations from the shelf off the east coast of India where this periodicity is absent even though local alongshore wind stress has it prominently, and so does the
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CO2 partial pressure and fluxes in the Amazon River plume using in situ and remote sensing data Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-13 Aline M. Valerio; Milton Kampel; Nicholas D. Ward; Henrique O. Sawakuchi; Alan C. Cunha; Jeffrey E. Richey
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Effects of river discharge and the California Current on pycnocline depth at the eastern entrance to the Gulf of California Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-21 David Serrano; Arnoldo Valle-Levinson
Monthly hydrographic data were obtained at one station for four years at the eastern entrance to the Gulf of California to determine the influence on the pycnocline of waters from river discharge or from the California Current. Data were collected from 2005 to 2009, 20 km offshore over a depth of 127 m on the continental shelf in the vicinity of the Tropic of Cancer. The 4-yr average of the maximum
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Contribution of Changjiang River discharge to CO2 uptake capacity of the northern East China Sea in August 2016 Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-13 Yujeong Choi; Dongseon Kim; Jae Hoon Noh; Dong-Jin Kang
Despite the known significant effect of the Changjiang River on the surface fugacity of CO2 (fCO2) in the northern East China Sea (ECS) during summer, the influence of the river on CO2 uptake capacity has yet to be quantified. In this study, spatial variation in surface fCO2 was studied in the northern ECS in August 2016. The controlling factors on surface fCO2 were identified and quantified. Surface
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Effects of sea level rise on storm surges in the south Yellow Sea: A case study of Typhoon Muifa (2011) Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-06 Jie Yang; Feng Yan; Meixiang Chen
Changes in sea levels due to climate change are expected to alter storm surge intensities worldwide, disproportionately effecting coastal communities. In this study, we explored the impacts of future sea level rise (SLR) on storm surges within various numerical frameworks. The relative mean sea level rise (RMSLR) scenario for a period of 100-yr was applied using satellite altimetry of sea surface height
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Bathymetric observations of an extreme tidal flow: Approaches to the Gulf of Corryvreckan, western Scotland, UK Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-13 Christian Armstrong; John A. Howe; Andrew Dale; Christopher Allen
The growing interest in tidal energy has led to a need to better understand the interaction between energetic tidal flows and submarine bathymetry. The Gulf of Corryvreckan (GoC) is a highly energetic tidal channel, ∼3.2 km long and ∼1.1 km wide with a maximum depth of 220m occurring between the islands of Scarba and Jura, western Scotland, UK. A high-resolution bathymetric survey of the region, groundtruthed
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Biophysical implications of the freshwater influx over small spatial scale in the coastal waters along the southwest coast of India during the Southwest Monsoon Cont. Shelf Res. (IF 2.424) Pub Date : 2021-01-02 S. Santhikrishnan; R. Jyothibabu; K.J. Albin; K.T. Alok; C. Karnan; N. Arunpandi; M.F. Camey; T.R. Gireesh Kumar
This study in the coastal waters off Kochi along the southwest coast of India during the Southwest Monsoon (SWM) presents the biophysical implications of freshwater influx over a small spatial scale. Field sampling was carried out along two cross-shore transects (ST and NT), oriented ~ 8 km apart, and located to the south (ST) and north (NT) of the Kochi inlet, up to the depth of 50 m. The vertical
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Estimation of the electric current density in the Gulf of California induced by the M2 tidal current Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-30 Rosalinda Monreal-Jiménez; David Alberto Salas-de-León; María Adela Monreal-Gómez; Noel Carbajal; Víctor Kevin Contreras-Tereza
The electric current density generated in the Gulf of California by the interaction between the ocean currents produced by the M2 tide and the geomagnetic field was calculated in this study. The value of the geomagnetic field in the Gulf of California was determined from World Magnetic Model 2010 data; the tidal velocities of the seawater were calculated using a three–dimensional hydrodynamic–numerical
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Generation, propagation and dissipation of internal tides on the continental shelf and slope off the west coast of India Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-17 M.P. Subeesh; A.S. Unnikrishnan; P.A. Francis
The present study focuses on the dynamics of M2 internal tides on the shelf and slope off the west coast of India (WCI) using a high-resolution (1/48∘) numerical ocean circulation model configured for the eastern Arabian Sea. The WCI is characterized by the presence of large internal tides where most of the internal tides generated on shelf-slope regions propagate offshore as beams. Baroclinic energy
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Kuroshio fractions in the southwestern sea of Japan; implications from radium isotopes Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-27 Mutsuo Inoue; Yuhei Shirotani; Toshiki Morokado; Shotaro Hanaki; Masashi Ito; Hiroaki Kameyama; Hisaki Kofuji; Akira Okino; Takafumi Shikata; Masa-aki Yoshida; Seiya Nagao
To understand complicated current systems, we examined the 228Ra activities and 228Ra/226Ra activity ratios in 290 surface waters in the southwestern Sea of Japan from 2015 to 2020. The 228Ra/226Ra ratios exhibited large seasonal variation, showing higher ratios in July–September (1.5–2.5) than in other months. The fractions of the Kuroshio Current from the Pacific Ocean (fK), based on the 228Ra activities
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Rapid organic matter cycling in North Sea sediments Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-23 Emil De Borger; Ulrike Braeckman; Karline Soetaert
Coastal shelf seas are zones of intense nutrient cycling, where a strong coupling between the sediment and the water column enhances primary productivity. To identify factors that control the strength of this benthic-pelagic coupling we measured sediment characteristics, solute fluxes, and porewater nutrient profiles in spring along a south - north transect in the North Sea crossing distinct regions:
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The impact of sea-level rise and basin area reduction on the cyclic behavior of tidal inlet systems Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-17 Klaas J.H. Lenstra; Maarten van der Vegt
Ebb-tidal deltas filter incoming wave energy and mitigate erosion of basins and coasts by temporarily providing sediment. In many systems, these coastal safety functions are under threat from human activities. Here we use Delft3D/SWAN to assess the effects of relative sea-level rise and changes in basin area on the long-term dynamics of ebb-tidal deltas. The results show that the time scales of the
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Sedimentation rates in the Baltic Sea: A machine learning approach Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-14 P.J. Mitchell; M.A. Spence; J. Aldridge; A.T. Kotilainen; M. Diesing
Sedimentation rate data are applied in a range of studies such as understanding the sediment carbon budget and accumulation of pollutants in marine sediments. Over many years, sedimentation rate samples have been collected within the Baltic Sea. However, to understand patterns in sedimentation rates more broadly across this sea basin requires converting these point data into continuous spatial predictions
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Comparative analysis of heavy mineral characteristics of sediments from the Huanghe River and the Changjiang River based on the multiple-window grain size strategy Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-16 Bingfu Jin; Mengyao Wang; Wei Yue
25 samples had been divided from the estuary of Huanghe, the abandoned Huanghe River, and the Changjiang River into multiple grain sizes in intervals of 0.5 Φ for heavy mineral analysis, which is a multiple-window grain size strategy. Each sample was divided into 6–9 subsamples for a total of 191 subsamples. The results show that the characteristics of the heavy minerals and the relative contents of
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Acoustic scattering characteristics and inversions for suspended concentration and particle size above mixed sand and mud beds Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-30 Peter D. Thorne; Ian D. Lichtman; David Hurther
The majority of reported field studies, using acoustic backscattering, for the measurement of nearbed suspended sediment processes, have been focussed on field sites with sand size fractions and unimodal size distributions. However, in many sedimentary environments, and particularly for estuaries and rivers, sands and muds coexist in the bed sediment substrate, forming a size regime that is often bimodal
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A nonlinear perturbation study of a shoreface nourishment on a multiply barred beach Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-05 W.L. Chen; N. Dodd
The 1D (cross-shore) nonlinear nourishment-as-a-perturbation model of Chen and Dodd (2019) is extended to include wave streaming and depth-varying mean return flow. This is shown to lead to physically consistent values for the migration rate of small amplitude bed perturbations in the whole nearshore region. The model is also extended to arbitrary wave incidence angle, and an alternative energy dissipation
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Rip currents in the southern Baltic Sea multi-bar nearshore zone Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-08 Jan Schönhofer; Aleksandra Dudkowska
Rip currents in the southern Baltic Sea coastal zone are one of the most incompletely known and least explored hydrodynamic phenomena. As they are rare, discussion on their nature, their contribution to the complex pattern of nearshore currents, and their effect on, inter alia, the seafloor transformations is still on-going. Observations made during this study confirmed the occurrence of rip currents
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Wintertime particulate organic matter distributions in surface waters of the northern California current system Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-25 Miguel A. Goñi; Kylie A. Welch; Emmanuel Alegria; Yvan Alleau; Katie Watkins-Brandt; Angelicque E. White
Semi-automated sampling via the surface underway systems of research vessels was used to explore the distribution and composition of particulate organic matter in surface waters of the northern California Current ecosystem during winter, a poorly studied period that is characterized by downwelling favorable winds and elevated discharge by coastal rivers. New wintertime observations were compared to
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SAM-driven variability of the southwestern Atlantic shelf sea circulation Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-05 Nicolás Bodnariuk; Claudia G. Simionato; Martín Saraceno
The objective of the present study is to analyze the interannual variability of the Southwestern Atlantic Continental Shelf (SWACS) circulation and its thermohaline structure. To accomplish it we employed the global ocean reanalysis ORAP5.0, which spans the 35-years period 1979–2013. ORAP5.0 satisfactorily reproduces the most distinctive features of the SWACS circulation and its variability on different
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Phytoplankton community succession and dynamics using optical approaches Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-04 Glaucia M. Fragoso; Geir Johnsen; Matilde S. Chauton; Finlo Cottier; Ingrid Ellingsen
The phytoplankton in coastal regions are responding to constant environmental changes, thus the use of proxies derived from in situ frequent time-series observations and validated from traditional microscopic or pigment methods can be a solution for detecting rapid responses of community dynamics and succession. In this study, we combine in situ high-frequency (every 30 min from May to September 2017)
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Sediment deposition affects mangrove forests in the Mekong delta, Vietnam Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-29 William Nardin; Iacopo Vona; Sergio Fagherazzi
Enhanced deposition is common near river mouths where large amounts of sediment is available. Our study focuses on the effects of sediment deposition on a mangrove forest in the Mekong river delta, Vietnam. At this site, the mangrove forest fringe is characterized by Sonneratia spp. and both mud and sand are present. High deposition rates bury mangrove roots and pneumatophores, causing forest dieback
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The shoaling mode-2 internal solitary waves in the Pacific coast of Central America investigated by marine seismic survey data Cont. Shelf Res. (IF 2.424) Pub Date : 2020-12-02 Wenhao Fan; Haibin Song; Yi Gong; Shaoqing Sun; Kun Zhang; Di Wu; Yunyan Kuang; Shun Yang
In this paper, the shoaling mode-2 internal solitary waves (ISWs) in the Pacific coast of Central America are studied for the first time using seismic oceanography method. It is found that there is an asymmetry in the vertical amplitude variation of the mode-2 ISWs front and rear during the shoaling process. The amplitude may weaken the effect of the pycnocline deviation on the stability of the mode-2
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Composition and supply of inorganic and organic nitrogen species in dry and wet atmospheric deposition: Use of organic nitrogen composition to calculate the Ocean's external nitrogen flux from the atmosphere Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-28 Hung-Yu Chen; Shih-Zhe Huang
Wet and dry depositions in the southern East China Sea (ECS) differ substantially in their relative proportion of high-molecular-weight organic nitrogen (HMW-ON) and low-molecular-weight organic nitrogen (LMW-ON). By distinguishing between ON with different molecular weights, this study proposes an improved calculation of the contributions of dry and wet depositions to the new production in surface
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Rapid reduction of tidal amplitude due to form drag in a narrow channel Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-13 Rachel M. Horwitz; Stephanne Taylor; Youyu Lu; Jean-Philippe Paquin; Douglas Schillinger; David A. Greenberg
Reversing Falls is a large sill in a narrow section of the Saint John River on the northern coast of the Bay of Fundy, Canada. Reversing Falls limits tides from propagating farther up the river and impedes river water flowing seaward. This work aims to describe the physical processes that control flow over Reversing Falls by using output from a regional numerical model. We find form drag is more important
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Historical reconstruction of trace element concentrations and fluxes in a tropical coastal lagoon (Mexican Pacific) derived from 210Pb radiochronology Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-29 Jorge Feliciano Ontiveros-Cuadras; Ana Carolina Ruiz-Fernández; Libia Hascibe Pérez-Bernal; José Rigoberto Raygoza-Viera; Joan-Albert Sanchez-Cabeza
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Bottom trawling on a carbonate shelf: Can you get what you see? Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-28 Maria Jacqueline Gomes de Barros; Leandro Nolé Eduardo; Arnaud Bertrand; Flávia Lucena Frédou; Thierry Frédou; Alex Souza Lira; Beatrice Padovani Ferreira
Bottom trawling is a common fisheries method and also a widespread scientific sampling method for benthic and demersal species. Selectivity and catchability are usually estimated using different meshes and studies with alternative methods are rare. In this study, to improve the estimation of trawl selectivity, we compare bottom trawl catches and recordings made by a camera fitted on the top of the
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The inner shelf geology of Atlantic Canada compared with the North Sea and Atlantic United States: Insights for Atlantic Canadian offshore wind energy Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-18 Jordan B.R. Eamer; John Shaw; Edward L. King; Kevin MacKillop
The Quaternary history of the Atlantic Canadian inner shelf shares some similarities with the North Sea and northern United States of America (US) Atlantic coast, with the influence of large-scale glaciation and subsequent sea level transgression being the main drivers of seafloor morphology, sedimentology, and uppermost stratigraphy. The geology of the inner shelf, generally confined to 100 m water
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Spatio-temporal dynamics of the Río de la Plata turbidity front; combining remote sensing with in-situ measurements and numerical modeling Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-19 Fernanda P. Maciel; Pablo E. Santoro; Francisco Pedocchi
The Río de la Plata is a micro-tidal estuary located in Southeast South America. With an annual mean flow of 26,500 m3/s, it receives 160 million tons/yr of suspended sediments. The high content of cohesive fine sediments in the estuary generates high turbidity levels in its inner and intermediate zones, which can be clearly seen in color satellite images. In this work, an image-based algorithm was
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Mesoscale eddies influencing the sub-Antarctic Prince Edward Islands archipelago: Temporal variability and impact Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-19 T Lamont; M.A.van den Berg
Mesoscale eddies in the Prince Edward Island (PEI) region of the Southern Ocean were identified and tracked using satellite altimetry over a 26-year period between 1993 and 2018. We further substantiated previous findings that eddies originating from the eddy hotspot east of the Southwest Indian Ridge have little direct effect on the PEIs, by demonstrating that over the 26-year period, only 3 cyclonic
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The Río de la Plata plume dynamics over the Southwestern Atlantic Continental Shelf and its link with the large scale atmospheric variability on interannual timescales Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-18 Nicolás Bodnariuk; Claudia G. Simionato; Marisol Osman; Martín Saraceno
The interannual variability of the Río de la Plata plume over the Southwestern Atlantic Continental Shelf is analyzed based on the global ocean reanalysis ORAP5.0 and the global atmospheric reanalysis Era-Interim for the 35-years period 1979–2013. A regional validation of the dataset is performed to evaluate the ocean reanalysis ability to solve the main features associated with the plume dynamics
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Groundwater chemistry and Sr isotope ratios shed light on connectivity and water-rock interactions in the coastal aquifer of the Caribbean coast, Mexico Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-09 L.M. Hernández-Terrones; J. Street; K. Null; A. Paytan
Radiogenic strontium isotopic ratios (87Sr/86Sr) and solute concentrations in groundwater samples from the coastal area of the eastern Yucatán Peninsula, Quintana Roo, Mexico were measured to assess connectivity and water-rock interactions within different groundwater systems in the region. The average 87Sr/86Sr ratios vary from south to north with values in Xcalak around 0.70889, Sian Ka'an around
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The role of advection and density gradients in driving the residual circulation along a macrotidal and convergent estuary with non-idealized geometry Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-12 Sohaib Alahmed; Lauren Ross; Aldo Sottolichio
Due to variations in channel depth, width, and lateral bottom profile, estuarine residual flows can exhibit significant variation in magnitude and transverse structure along macrotidal and convergent estuaries. This article explores the along-channel residual flow (magnitude and transverse structure), forcing mechanisms and their variations along the Gironde estuary in France. With emphasis on the
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Acoustic backscatter analysis of ground-fishing activity in the German North Sea sector Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-05 T. Lüdmann; Y.M. Saitz; J. Metzing; K.-C. Emeis
The physical impact of demersal fishing was studied in three different areas of the German North Sea sector by use of a multibeam echosounder. The areas represent typical shallow seas siliciclastic habitats in variable distance to the coastline. Their seabed substrate is dominated by coarse silt close to the shore and by fine sand in the most distal area on the Dogger Bank. The study documents the
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Estimation of cell abundances of picophytoplankton based on the absorption coefficient of phytoplankton in the South China sea Cont. Shelf Res. (IF 2.424) Pub Date : 2020-11-13 Wendi Zheng; Wen Zhou; Wenxi Cao; Lin Deng; Guifeng Wang; Zhantang Xu; Cai Li; Yuezhong Yang; Kai Zeng; Yu Zhang; Shuibo Hu
Picophytoplankton are essential components of phytoplankton in the oligotrophic South China Sea (SCS). Understanding the variation in the picophytoplankton community structure will provide important information about primary production and the biogeochemical cycling of carbon in the SCS. Based on a field dataset from the SCS, we developed empirical algorithms using the absorption coefficient of phytoplankton
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Seasonal controls of the carbon biogeochemistry of a fringing coral reef in the Gulf of California, Mexico Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-28 C.O. Norzagaray; J.M. Hernández-Ayón; Castro R; L.E. Calderón-Aguilera; Martz T; J.A. Valdivieso-Ojeda; R. Lara-Lara
The surface of the ocean has absorbed one-third of the CO2gas that has been released by anthropogenic activities, which has resulted in a reduction in pH and the aragonite saturation state (Ωara) with potential negative impacts in calcifying organisms, such as corals. To evaluate these effects, the natural variability present must first be understood, including that of processes that operate at diurnal
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A new approach to analytical modelling of groyne fields Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-28 Antonios Valsamidis; Dominic E. Reeve
Analytical and computational techniques for finding solutions to the equations describing shoreline evolution are widely known and the advantages and disadvantages of both are well documented. Initial analytical solutions to the 1-line models were restricted to constant wave conditions and simple beach/structure configurations. Recent developments in analytical treatments have allowed solutions to
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A long-term study on Coolia monotis distribution from the south-east Mediterranean Sea Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-03 Moufida Abdennadher; Amel Bellaaj Zouari; Wafa Feki Sahnoun; Lamia Dammak Walha; Mabrouka Mahfoudi; Asma Hamza
The potentially toxic species Coolia monotis is widespread along the Mediterranean coasts. The Gulf of Gabès is one of the affected areas in the south-eastern part of the Mediterranean Sea. Distribution patterns of C. monotis in relation to temperature and salinity were investigated at 24 monitoring sites along the Gulf of Gabès coasts during 22 years (1997–2018). The analysis of C. monotis occurrence
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Sea level rise inducing tidal modulation along the coasts of Bengal delta Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-27 Md Jamal Uddin Khan; Fabien Durand; Laurent Testut; Yann Krien; A.K.M. Saiful Islam
The Bengal delta, the largest delta on the Earth, is subject to a marked coastal flooding hazard and associated with widespread vulnerability. The situation will expectedly deteriorate in the ongoing context of sea level rise. This sea level rise will not only have a direct effect on the coastal flooding, but will also have indirect effects, through the alteration of the coastal hydrodynamics. In the
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Armoring and exposure effects on the wave-driven sediment transport Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-28 Yashar Rafati; Tian-Jian Hsu; Zhen Cheng; Xiao Yu; Joseph Calantoni
Coastal sediment transport of graded spherical particles with the material properties of sand was simulated and compared to transport of the uniform-sized spherical particles using a two-phase Eulerian-Lagrangian model. The fluid phase solver was based on SedFoam developed in OpenFOAM and the open-source discrete element method solver LIGGGHTS was used for the particle phase. We validated the model
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Trace metal concentrations in soil-plant complex in rocky shore salt marshes of Central Patagonia Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-24 Yanina L. Idaszkin; Eleonora S. Carol; José M. Barcia-Piedras; Pablo J. Bouza; Enrique Mateos-Naranjo
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Wave transmission through living shoreline breakwalls Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-16 I. Safak; C. Angelini; P.L. Norby; N. Dix; A. Roddenberry; D. Herbert; E. Astrom; A. Sheremet
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High amplitude internal tidal waves generated over an underwater sill in the Gulf of California Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-28 Anatoliy Filonov; Iryna Tereshchenko; Lydia B. Ladah; Diego A. Pantoja-Gonzalez; Federico A. Velázquez-Muñoz
The first in-situ measurements of the internal tidal waves generated at San Esteban sill in the archipelago of the large islands of the Gulf of California (GC), Mexico, show that the semidiurnal barotropic tide generates nonlinear internal tides which propagate to the North (South) during the ebb (flood) of the barotropic tidal wave, resulting in significant changes in temperature and salinity to depths
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Sr–Nd isotopes indicating the provenance of siliciclastic sediments and paleoenvironmental changes in the middle Okinawa Trough during the last deglaciation Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-27 Ningjing Hu; Peng Huang; Hui Zhang; Ying Zhang; Xuefa Shi; Jihua Liu; Xiaorong Fan
Sediment provenance and transport, together with the forcing mechanism behind provenance changes in the middle Okinawa Trough over the past 16 kyr, were reconstructed using records of elemental and Sr–Nd isotopic compositions within the chronological framework of accelerator mass spectrometry radiocarbon dating. Results clearly revealed four notable phases of change in the sediment provenance those
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Mathematical modeling of arctic sea ice freezing and melting based on nonlinear growth theory Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-20 Chenglin Duan; Sheng Dong; Zhifeng Wang
The spatiotemporal distribution of sea ice in the cold Arctic region is of climatic and engineering significance. However, in terms of statistics, there remains a lack of quantitative mathematical descriptions of the annual periodic sea ice cycle for the entire Arctic and its regional seas. Using the semi-enclosed and seasonally ice-covered Kara Sea as a systematic case study, this quantitative study
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Diurnal variation of abundance of bacterioplankton and high and low nucleic acid cells in a mangrove dominated estuary of Indian Sundarbans Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-03 Rishmita Mukherjee; Avanti Acharya; Vandana Kumari Gupta; Sneha Bakshi; Madhusudan Paul; Prasun Sanyal; Sandip Kumar Mukhopadhyay
We investigated diurnal-scale variations in the abundances of bacterioplankton, high and low nucleic acid (HNA, LNA) cells, and associated physico-chemical variables in a mangrove dominated estuary of the Indian Sundarbans, during pre-monsoon and monsoon conditions. Bacterioplankton abundance (BA) varying from 1.83 ± 0.47 to 0.34 ± 0.11 × 109 cells L−1 with lowest abundance during the monsoon, was
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Relationship between dimorphism and drift in the Portuguese man-of-war Cont. Shelf Res. (IF 2.424) Pub Date : 2020-10-10 Luis Ferrer; Manuel González
One interesting feature of the Portuguese man-of-war (Physalia physalis) is its dimorphism, with the existence of two distinct forms (left- and right-handed individuals). The worldwide distribution of this dimorphic wind-propelled siphonophore is a much discussed but poorly understood phenomenon. Here we investigate the most likely region of origin and routes of more than 3,500 individuals of this
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Mesoscale eddies influencing the sub-Antarctic Prince Edward Islands Archipelago: Origin, pathways, and characteristics Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-29 T. Lamont; M.A. van den Berg
Mesoscale eddies are known to strongly influence oceanographic properties and biological responses. Since eddies can transport physical characteristics and biota, knowledge of their origin, pathways, and characteristics is important for understanding their potential impacts on ecosystems such as the Prince Edward Island (PEI) archipelago. Over a 26-year period (1993–2018), a total of 395 (724) cyclonic
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Abundance and community structure of ammonium monooxygenase (amoA) genes in the wet season of liaohe estuary sediments Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-18 Hongxia Ming; Huizhen Zhang; Quanrui Chen; Yantao Wang; Jie Su; Xiaohui Zhao; Jingfeng Fan
Ammonia oxidation is an important part of the global nitrogen cycle. Ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) are important players in the ammoxidation process. In this study, 13 sediment samples from the Liaohe estuary were collected in the wet season. The abundances of 16S rRNA and amoA genes were detected by real-time fluorescence quantitative PCR. The diversity and community
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Are marine benthic microeukaryotes different from macrobenthos in terms of regional geographical distribution? New insights revealed by RNA metabarcoding Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-17 Pingping Huang; Feng Zhao; Kuidong Xu; Tong Zhou
The Yellow Sea Cold Water Mass (YSCWM) is a unique hydrological phenomenon in the central Yellow Sea, resulting in different macrobenthos community compositions inside and outside the YSCWM. However, this pattern in benthic microeukaryotes has never been identified by morphological methods and DNA sequencing. To determine whether microeukaryotes differ from macrobenthos in terms of regional geographical
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Influence of mesoscale eddies on cross-shelf exchange in the western Gulf of Mexico Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-08 Lorena Guerrero; Julio Sheinbaum; Ismael Mariño-Tapia; Joana Julieta González-Rejón; Paula Pérez-Brunius
This study uses ROMS (Regional Ocean Modeling System) with realistic forcing to analyse cross-shelf transport associated with the presence of mesoscale anticyclones as they interact with the western shelf of the Gulf of Mexico. Daily outputs from this validated 15-year numerical simulation were used to calculate the depth and time averaged cross-shelf volume transport through the 200 m isobath, used
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Interannual variability of surface satellite-derived chlorophyll concentration in the bay of La Paz, Mexico, during 2003–2018 period: The ENSO signature Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-15 Hugo Herrera-Cervantes; Salvador E. Lluch-Cota; Jorge Cortés-Ramos; Luis Farfán; Rufino Morales-Aspeitia
The Bay of La Paz (BLPZ), located in the southwestern Gulf of California, is a region of significant biological productivity and strong environmental variability that remains to be understood. In particular, the spatial signature of different El Niño-Southern Oscillation (ENSO) conditions and their impact on the ecology of the bay remains puzzling because of contrasting field observations. In this
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Influence of lateral advection on phytoplankton size-structure and composition in a Mediterranean coastal area Cont. Shelf Res. (IF 2.424) Pub Date : 2020-08-28 F. Decembrini; C. Caroppo; A. Bergamasco
Phytoplankton size is a significant functional trait affecting many ecological processes and influencing the carbon fate and the trophic regimes of the ecosystems. In this study, we examined the effect of the lateral advection of nutrient-rich Messina Mixed Waters on the phytoplankton size structure and community composition in the euphotic layer of the Gulf of Augusta (Western Ionian Sea) in early
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Species-specific patterns of distribution and abundance of the cryptic copepods Pseudocalanus moultoni and P. newmani on Georges Bank (NW Atlantic Ocean) during spring 1995–2012 Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-06 Kayla E. Crouch; Leocadio Blanco-Bercial; David E. Richardson; Nancy J. Copley; Peter H. Wiebe; Ann Bucklin
Time-series analysis of zooplankton species diversity, distribution, and abundance are essential for ecosystem assessment and fisheries management on continental shelves. This study analyzed two morphologically cryptic species of the calanoid copepod Pseudocalanus, P. moultoni and P. newmani, in zooplankton samples collected during May–June 1995–2012 over Georges Bank, NW Atlantic Ocean. Samples were
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Influence of eddies on phytoplankton composition in the Bay of Bengal Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-06 V.V.S.S. Sarma; G.R. Rajula; D.S.L. Durgadevi; G. Sampath Kumar; J. Loganathan
Several cyclonic (CE) and anticyclonic (ACE) eddies form in the Bay of Bengal (BoB) and they expect to contain different proportion of nutrients due to divergence and convergence of waters respectively and may have impact on phytoplankton composition. In order to test this hypothesis, one CE and two ACE (north ACE (ACEN) and south ACE (ACES)) were sampled in the BoB during spring intermonsoon. Higher
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Radiolarian biogeographic contrast between spring of 2017 and winter of 2017–2018 in the South China sea and Malacca Strait Cont. Shelf Res. (IF 2.424) Pub Date : 2020-09-12 Jie Zhang; Lanlan Zhang; Rong Xiang; Noritoshi Suzuki; Zhuoya Qiu; Qiang Zhang
Radiolarians are planktonic protozoon that play an important role in marine ecosystem and paleoenvironmental construction. The South China Sea (SCS) and Malacca Strait (MLS), strongly influenced by the East Asian monsoon, are the key gateway between the Pacific and Indian Oceans. However, few studies of radiolarians in the water column are performed during winter and spring in the SCS and MLS due to
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Juvenile Oblada melanura (L. 1758) otolith shape is impacted near recreational harbours or due to settlement position in nearby sites Cont. Shelf Res. (IF 2.424) Pub Date : 2020-08-29 P.S.P. Vandenbussche; G. Spennato; P.M. Pierson
The coastal zone is a hotspot of biodiversity and anthropogenic activities. Its conservation is of major concern. To test whether different types of environmental disturbance have an impact on marine fishes, in this three-year study we have compared otolith shapes of Oblada melanura juveniles. One type of disturbance was the type of site: recreational harbours, waterway mouths, or preserved from identified
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Turbulent mixing and vertical nitrate flux induced by the semidiurnal internal tides in the southern Yellow Sea Cont. Shelf Res. (IF 2.424) Pub Date : 2020-08-31 Pengzhao Xu, Wei Yang, Baisu Zhu, Hao Wei, Liang Zhao, Hongtao Nie
Based on mooring observations carried out in the southern Yellow Sea during late summer 2017, this study focuses on the characteristics of the internal tide-induced turbulent mixing and the influences on the vertical transport of nitrates. We observe clear semidiurnal pycnocline displacements with an amplitude of ~3.5 m during 25 h. The baroclinic velocity and velocity shear are mainly controlled by
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The effects of anthropogenic nutrient inputs on stable carbon and nitrogen isotopes in suspended particulate organic matter in Jiaozhou Bay, China Cont. Shelf Res. (IF 2.424) Pub Date : 2020-08-29 Zhixin Ke, Danting Chen, Jiaxing Liu, Yehui Tan
The values of δ13C and δ15N in POM and nutrient concentrations were investigated in the surface water of Jiaozhou Bay during spring, summer and autumn. Results showed that eutrophic conditions were generally the highest in the northeastern bay during the three seasons. It suggested the sewage from urban rivers were the major pollution source in the northeastern Jiaozhou Bay. The δ13C value of POM was
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Effects of recent morphological change on the redistribution of flow discharge in the Yangtze River Delta Cont. Shelf Res. (IF 2.424) Pub Date : 2020-08-25 Haochuan Feng, Liqun Tang, Yuhai Wang, Chuansheng Guo, Dabin Liu, Huiming Zhao, Liping Zhao, Wei-Jie Wang
Morphological evolution in tidally influenced estuarine channel networks has strong influence on the redistribution of fluvial discharge and tidal motion. Based on channel bathymetry and hydrological data observed in 2002 and 2016, this study investigated the influence of morphological evolution on subtidal flow division in the Yangtze River Delta. Experiments using a 2D hydrodynamic model revealed
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Land subsidence and its effects on coastal erosion in the Nam Dinh Coast (Vietnam) Cont. Shelf Res. (IF 2.424) Pub Date : 2020-08-22 Quang Hao Nguyen, Satoshi Takewaka
The Nam Dinh Coast is a constituent part of the dynamic coastline, belonging to the Red River Delta. It is bounded to the north and south by the Red and Day Rivers, with Ninh Co and So Rivers located in the middle. This coast has been undergoing severe erosion during the last hundred years. Over this period, vital agricultural area along the coastline has vanished into the sea and families have been
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