Pub Date : 2023-06-19DOI: 10.1590/2675-2824071.22104jpo
Julia Petroski Olher, M. Gasalla
known as South Brazil Bight. In addition, we analyzed their biomass and fisheries landings in order to examine shifts over time. The content of 432 stomachs was analyzed at the lowest taxonomic level possible. The frequencies of occurrence were used to cluster species, revealing three trophic guilds: "Planktivorous Clupeiformes", "Planktivorous Carangiformes", and "Piscivores". Most Carangidae consumed mainly copepods and other small crustaceans, except Selene setapinnis which clustered in the piscivorous guild together with Scombriformes specimens. In terms of biomass, the dominance of Trachurus lathami , Sardinella brasiliensis , and Trichiurus lepturus was evident. The species' trophic levels ranged from 2.98 to 4.5, showing that these fishes occupied intermediate to high trophic position. Comparing fisheries landings in two study periods (1986-2002 and 2003-2019), six species showed a decrease, while three an increase. Correlations between landings of the Brazilian sardine ( Sardinella brasiliensis ) and other pelagic fishes indicate that when the former's decreases, the catch of alternative species, such as Opisthonema oglinum and Chloroscombrus chrysurus , increases. The intermediate position of small pelagics in the food web may affect the availability of commercial species by controlling the abundance of lower and upper trophic-level organisms. These findings fill essential gaps for ecosystem modeling, suggesting that ecosystem-based fisheries management should address multispecies issues of the pelagic realm rather than only single-species approaches. Combining past survey data with yield trends provides evidence for both natural and human-induced ocean changes. Abstract
{"title":"On the trophic role of pelagic fishes and fishery landings shifts in the South Brazil Bight","authors":"Julia Petroski Olher, M. Gasalla","doi":"10.1590/2675-2824071.22104jpo","DOIUrl":"https://doi.org/10.1590/2675-2824071.22104jpo","url":null,"abstract":"known as South Brazil Bight. In addition, we analyzed their biomass and fisheries landings in order to examine shifts over time. The content of 432 stomachs was analyzed at the lowest taxonomic level possible. The frequencies of occurrence were used to cluster species, revealing three trophic guilds: \"Planktivorous Clupeiformes\", \"Planktivorous Carangiformes\", and \"Piscivores\". Most Carangidae consumed mainly copepods and other small crustaceans, except Selene setapinnis which clustered in the piscivorous guild together with Scombriformes specimens. In terms of biomass, the dominance of Trachurus lathami , Sardinella brasiliensis , and Trichiurus lepturus was evident. The species' trophic levels ranged from 2.98 to 4.5, showing that these fishes occupied intermediate to high trophic position. Comparing fisheries landings in two study periods (1986-2002 and 2003-2019), six species showed a decrease, while three an increase. Correlations between landings of the Brazilian sardine ( Sardinella brasiliensis ) and other pelagic fishes indicate that when the former's decreases, the catch of alternative species, such as Opisthonema oglinum and Chloroscombrus chrysurus , increases. The intermediate position of small pelagics in the food web may affect the availability of commercial species by controlling the abundance of lower and upper trophic-level organisms. These findings fill essential gaps for ecosystem modeling, suggesting that ecosystem-based fisheries management should address multispecies issues of the pelagic realm rather than only single-species approaches. Combining past survey data with yield trends provides evidence for both natural and human-induced ocean changes. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-19DOI: 10.1590/2675-2824071.22117hvt
Huynh Van Thao, N. V. Cong
the average mangrove forest and shrimp pond ratio was 56.90:42.70 (%). Two technical issues were highlighted: (i) the use of rotenone, known as a toxin to kill undesirable fish before stocking shrimp, and (ii) annual shrimp pond regeneration causing increased pollution. The data showed that higher concentrations of TSS and P-PO 43-were detected in surrounding rivers, while surface water in either IMSF ponds or adjacent rivers slightly surpassed the permissible levels of total Fe concentration. All parameters—including heavy metals; toxic and persistent parameters; oil and grease and coliforms analysed in surface water, and sediment samples—were lower than the detection and permissible levels. The results provided evidence that the IMSF’s practices and environmental characteristics were suitable for recommending the Naturland Standards. Recommendations and technical interventions for farmers are necessary to help reduce Fe levels and the safe use of rotenone in IMSF systems. An environmental quality monitoring programme at the target area should be applied when launching organic shrimp production.
{"title":"Characteristics of integrated mangrove-shrimp farming systems in Ben Tre Province, Vietnam: preliminary findings for organic shrimp production certification","authors":"Huynh Van Thao, N. V. Cong","doi":"10.1590/2675-2824071.22117hvt","DOIUrl":"https://doi.org/10.1590/2675-2824071.22117hvt","url":null,"abstract":"the average mangrove forest and shrimp pond ratio was 56.90:42.70 (%). Two technical issues were highlighted: (i) the use of rotenone, known as a toxin to kill undesirable fish before stocking shrimp, and (ii) annual shrimp pond regeneration causing increased pollution. The data showed that higher concentrations of TSS and P-PO 43-were detected in surrounding rivers, while surface water in either IMSF ponds or adjacent rivers slightly surpassed the permissible levels of total Fe concentration. All parameters—including heavy metals; toxic and persistent parameters; oil and grease and coliforms analysed in surface water, and sediment samples—were lower than the detection and permissible levels. The results provided evidence that the IMSF’s practices and environmental characteristics were suitable for recommending the Naturland Standards. Recommendations and technical interventions for farmers are necessary to help reduce Fe levels and the safe use of rotenone in IMSF systems. An environmental quality monitoring programme at the target area should be applied when launching organic shrimp production.","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-05DOI: 10.1590/2675-2824071.20019adfl
Antônia Duciene Feitosa Lima, H. Hazin, Guelson Batista da Silva, Marcelo Augusto Bezerra
Studies relating the populational structure of target species to operational and environmental variables contribute directly to the management of the fisheries in these resources. Therefore, this study aimed to provide data on fishing and ecology of the swordfish ( Xiphias gladius ) caught by the Brazilian longline fleet operating in the western Atlantic between 2010 and 2016. Generalized additive mixed models were used to evaluate the relationship between explanatory variables and responses based on Catch Per Unit of Effort (CPUE) data. Results show that the Brazilian longline fleet catches the swordfish mostly between latitudes of 5°N to 30°S and longitudes of 20° to 50°W and that the swordfish prefers temperatures under 25°C at depths below 60 meters. The species showed a tendency toward intermediate light intensity, predominating in the crescent moon phase, and a preference for areas with low chlorophyll concentrations. Our findings on operational and environmental interactions with swordfish CPUE suggest areas and times that can be used by fishing fleets and government institutions as a starting point for swordfish management strategies.
{"title":"Spatio-temporal distribution of the swordfish Xiphias gladius (Linnaeus, 1758) caught by the Brazilian longline fleet.","authors":"Antônia Duciene Feitosa Lima, H. Hazin, Guelson Batista da Silva, Marcelo Augusto Bezerra","doi":"10.1590/2675-2824071.20019adfl","DOIUrl":"https://doi.org/10.1590/2675-2824071.20019adfl","url":null,"abstract":"Studies relating the populational structure of target species to operational and environmental variables contribute directly to the management of the fisheries in these resources. Therefore, this study aimed to provide data on fishing and ecology of the swordfish ( Xiphias gladius ) caught by the Brazilian longline fleet operating in the western Atlantic between 2010 and 2016. Generalized additive mixed models were used to evaluate the relationship between explanatory variables and responses based on Catch Per Unit of Effort (CPUE) data. Results show that the Brazilian longline fleet catches the swordfish mostly between latitudes of 5°N to 30°S and longitudes of 20° to 50°W and that the swordfish prefers temperatures under 25°C at depths below 60 meters. The species showed a tendency toward intermediate light intensity, predominating in the crescent moon phase, and a preference for areas with low chlorophyll concentrations. Our findings on operational and environmental interactions with swordfish CPUE suggest areas and times that can be used by fishing fleets and government institutions as a starting point for swordfish management strategies.","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"59 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139370845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-07DOI: 10.1590/2675-2824071.22113cc
Carla Christie, L. Cárcamo-Ulloa
materials. Learning Objectives of the science primary curriculum were reviewed, and the number and type of fauna species shown in images were recorded. For each textbook, we recorded the number of marine and terrestrial animals, categorized endemic, native, and exotic species, and whether the name of the animal was labeled with the image. The results show that only three Learning Objectives of the primary curriculum explicitly define content associated with the ocean. Of the total animal images, slightly more than twenty percent are marine fauna. The great majority of the marine animals shown are native, however, most of the time the image is not reinforced with the name of the species. Considering that school textbooks are the foundation of formal education, this preliminary study indicates that there is a content deficit when teaching about the relevance of the ocean and its animal species in primary school textbooks in Chile, covering only three ocean literacy principles in the science curriculum. However, this study recognizes that important improvements have been made in prioritizing natural science teaching with images of native species. Abstract
{"title":"How is the ocean represented in school textbooks in Chile? An analysis of curricular content and images of marine fauna","authors":"Carla Christie, L. Cárcamo-Ulloa","doi":"10.1590/2675-2824071.22113cc","DOIUrl":"https://doi.org/10.1590/2675-2824071.22113cc","url":null,"abstract":"materials. Learning Objectives of the science primary curriculum were reviewed, and the number and type of fauna species shown in images were recorded. For each textbook, we recorded the number of marine and terrestrial animals, categorized endemic, native, and exotic species, and whether the name of the animal was labeled with the image. The results show that only three Learning Objectives of the primary curriculum explicitly define content associated with the ocean. Of the total animal images, slightly more than twenty percent are marine fauna. The great majority of the marine animals shown are native, however, most of the time the image is not reinforced with the name of the species. Considering that school textbooks are the foundation of formal education, this preliminary study indicates that there is a content deficit when teaching about the relevance of the ocean and its animal species in primary school textbooks in Chile, covering only three ocean literacy principles in the science curriculum. However, this study recognizes that important improvements have been made in prioritizing natural science teaching with images of native species. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-27DOI: 10.1590/2675-2824071.22109fm
Flavia Macedo, Carlos Augusto Schettini, J. Arigony-Neto
Knowledge of coastal hydrodynamics is essential for understanding the processes of transport of dissolved or particulate material since in these areas there are large ports and the vessel traffic with a greater possibility of accidents. Studies related to currents are of fundamental importance to support decision-making to mitigate environmental impacts. The present work aims to test the technique of measuring currents through drones, as it has the advantage of a quick response in obtaining and analyzing data. For this study, a field survey was carried out in the region of the mouth of Lagoa dos Patos, RS, Brazil. The method's validation was done through the use of a colored tracer in which it was used to measure the surface current velocities simultaneously with the vectors generated by the drone. The results obtained a percentage difference between the methods of 10%, both for speed and for current direction, showing to be very promising for the use of drones to obtain surface current fields. In this way, it opens a new perspective in carrying out field experiments, so new experiments will be carried out to verify the feasibility of using this technique in different conditions, such as in the surf zone and areas with the presence of density fronts. Abstract
{"title":"Obtaining surface current field from drone imaging","authors":"Flavia Macedo, Carlos Augusto Schettini, J. Arigony-Neto","doi":"10.1590/2675-2824071.22109fm","DOIUrl":"https://doi.org/10.1590/2675-2824071.22109fm","url":null,"abstract":"Knowledge of coastal hydrodynamics is essential for understanding the processes of transport of dissolved or particulate material since in these areas there are large ports and the vessel traffic with a greater possibility of accidents. Studies related to currents are of fundamental importance to support decision-making to mitigate environmental impacts. The present work aims to test the technique of measuring currents through drones, as it has the advantage of a quick response in obtaining and analyzing data. For this study, a field survey was carried out in the region of the mouth of Lagoa dos Patos, RS, Brazil. The method's validation was done through the use of a colored tracer in which it was used to measure the surface current velocities simultaneously with the vectors generated by the drone. The results obtained a percentage difference between the methods of 10%, both for speed and for current direction, showing to be very promising for the use of drones to obtain surface current fields. In this way, it opens a new perspective in carrying out field experiments, so new experiments will be carried out to verify the feasibility of using this technique in different conditions, such as in the surf zone and areas with the presence of density fronts. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.1590/2675-2824071.21092ml
M. Lobo, Daniel Loureiro, A. Nepomuceno, Leandro Alves, F. Lamego
areas of the least developed countries has been associated with an increase in impermeable areas and poor domestic sewage treatment, increasing land-based runoff of nutrients and suspended solids from catchments. This study aimed to assess the biogeochemical changes caused by human interventions through the analysis of the spatial distribution of sedimentary phosphorus (P) and its mass balance in the Itaipu lagoon, located on the east coast of the state of Rio de Janeiro. Human intervention in the Itaipu lagoon system has caused severe imbalances in biogeochemical cycles over the past decades. Watercourses have been channeled to normalize the hydrological regime and increase hydraulic energy, improving sediment transport capacity. In this context, the increase in runoff from the coastal urban basin into the Itaipu lagoon has buried an increasing amount of phosphorus in the sediment. Recently, a regional increase in storm events caused a series of landslides and floods, which have been reported as possible consequences of global climate change. In recent decades, the synergy between landslides and river channeling has increased TP loads, accelerating phosphorus settling and changing P spatial distribution in surface sediments. This has accelerated siltation of the lagoon with an accumulation of nutrients and organic matter, leading in some cases to sediment anoxia. The lagoon has undergone strong eutrophication, changing its trophic state from meso-to hypertrophic in less than 30 years, even though P loads are not as high as in other coastal lagoons. Our findings confirm that human intervention impacts nutrient loads, which in turn disrupt the balance of biogeochemical cycles, compromising coastal water resources. This leads to the collapse of ecosystem services, another step towards degrading planetary boundaries. Abstract
{"title":"Phosphorus spatial distribution and mass balance in the Itaipu lagoon (Rio de Janeiro, Brazil)","authors":"M. Lobo, Daniel Loureiro, A. Nepomuceno, Leandro Alves, F. Lamego","doi":"10.1590/2675-2824071.21092ml","DOIUrl":"https://doi.org/10.1590/2675-2824071.21092ml","url":null,"abstract":"areas of the least developed countries has been associated with an increase in impermeable areas and poor domestic sewage treatment, increasing land-based runoff of nutrients and suspended solids from catchments. This study aimed to assess the biogeochemical changes caused by human interventions through the analysis of the spatial distribution of sedimentary phosphorus (P) and its mass balance in the Itaipu lagoon, located on the east coast of the state of Rio de Janeiro. Human intervention in the Itaipu lagoon system has caused severe imbalances in biogeochemical cycles over the past decades. Watercourses have been channeled to normalize the hydrological regime and increase hydraulic energy, improving sediment transport capacity. In this context, the increase in runoff from the coastal urban basin into the Itaipu lagoon has buried an increasing amount of phosphorus in the sediment. Recently, a regional increase in storm events caused a series of landslides and floods, which have been reported as possible consequences of global climate change. In recent decades, the synergy between landslides and river channeling has increased TP loads, accelerating phosphorus settling and changing P spatial distribution in surface sediments. This has accelerated siltation of the lagoon with an accumulation of nutrients and organic matter, leading in some cases to sediment anoxia. The lagoon has undergone strong eutrophication, changing its trophic state from meso-to hypertrophic in less than 30 years, even though P loads are not as high as in other coastal lagoons. Our findings confirm that human intervention impacts nutrient loads, which in turn disrupt the balance of biogeochemical cycles, compromising coastal water resources. This leads to the collapse of ecosystem services, another step towards degrading planetary boundaries. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-10DOI: 10.1590/2675-2824071.22116ra
Rémy Asselot, R. Brander
three-dimensional variability of the subaerial beach is examined
{"title":"Short-term dynamics of a high energy embayed beach: Stanwell Park, NSW, Australia","authors":"Rémy Asselot, R. Brander","doi":"10.1590/2675-2824071.22116ra","DOIUrl":"https://doi.org/10.1590/2675-2824071.22116ra","url":null,"abstract":"three-dimensional variability of the subaerial beach is examined","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1590/2675-2824071.22040ek
E. Kristensen, T. Valdemarsen, P. C. Moraes, A. Z. Güth, P. Sumida, C. Quintana
This study evaluated the effects of biogenic structures (tree roots and crab burrows) on sediment carbon (C), sulfur (S)
本研究评估了生物成因结构(树根和蟹洞)对沉积物碳(C)、硫(S)的影响。
{"title":"Anaerobic carbon oxidation in sediment of two Brazilian mangrove forests: the influence of tree roots and crab burrows","authors":"E. Kristensen, T. Valdemarsen, P. C. Moraes, A. Z. Güth, P. Sumida, C. Quintana","doi":"10.1590/2675-2824071.22040ek","DOIUrl":"https://doi.org/10.1590/2675-2824071.22040ek","url":null,"abstract":"This study evaluated the effects of biogenic structures (tree roots and crab burrows) on sediment carbon (C), sulfur (S)","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1590/2675-2824071.22044gf
Gustavo Fonseca, D. C. Vieira
{"title":"Overcoming the challenges of data integration in ecosystem studies with machine learning workflows: an example from the Santos project","authors":"Gustavo Fonseca, D. C. Vieira","doi":"10.1590/2675-2824071.22044gf","DOIUrl":"https://doi.org/10.1590/2675-2824071.22044gf","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1590/2675-2824071.2206icas
Ilson C. A. da Silveira, P. S. Bernardo, C. Z. Lazaneo, João P. M. Amorim, Milton Borges-Silva, R. C. Martins, Daniel M. C. Santos, M. Dottori, Wellington C. Belo, R. Martins, L. A. A. Guerra, Daniel L. Moreira
This work describes the circulation over the continental slope and the São Paulo Plateau in the Santos Basin during the SANSED winter 2019 survey. The cruise consisted of four legs in the period between June, 11 and August, 03 2019. The observed circulation is dominated by the Atlantic southwestern boundary current regime and remotely-generated anticyclones and cyclones. The former is composed by the Brazil Current, the Intermediate Western Boundary Current and their mesoscale meanders; the latter are 300km vortical rings with origin in the eastern side of the South Atlantic Basin. A Lagrangian scheme applied over satellite altimeter maps indicate that the origin of these rings is primarily the Cape Basin off South Africa. The interaction between the boundary currents, their cyclonic meanders, and the anticyclonic rings is complex, and varies widely. During the SANSED winter 2019 survey period, three anticyclones interacted with the Brazil Current, instabilizing it, forming dipoles with the current cyclonic meanders, leading to their downstream propagation. Ancienter cyclonic eddies within Santos Basin may interfere with the propagation of the large anticyclones further south. In addition, the continuous arrival of remotely-originated anticyclones, the larger portion over the São Paulo Plateau presented a tendency of counter-clockwise circulation during the whole cruise period.
{"title":"Oceanographic conditions of the continental slope and deep waters in Santos Basin: the SANSED cruise (winter 2019)","authors":"Ilson C. A. da Silveira, P. S. Bernardo, C. Z. Lazaneo, João P. M. Amorim, Milton Borges-Silva, R. C. Martins, Daniel M. C. Santos, M. Dottori, Wellington C. Belo, R. Martins, L. A. A. Guerra, Daniel L. Moreira","doi":"10.1590/2675-2824071.2206icas","DOIUrl":"https://doi.org/10.1590/2675-2824071.2206icas","url":null,"abstract":"This work describes the circulation over the continental slope and the São Paulo Plateau in the Santos Basin during the SANSED winter 2019 survey. The cruise consisted of four legs in the period between June, 11 and August, 03 2019. The observed circulation is dominated by the Atlantic southwestern boundary current regime and remotely-generated anticyclones and cyclones. The former is composed by the Brazil Current, the Intermediate Western Boundary Current and their mesoscale meanders; the latter are 300km vortical rings with origin in the eastern side of the South Atlantic Basin. A Lagrangian scheme applied over satellite altimeter maps indicate that the origin of these rings is primarily the Cape Basin off South Africa. The interaction between the boundary currents, their cyclonic meanders, and the anticyclonic rings is complex, and varies widely. During the SANSED winter 2019 survey period, three anticyclones interacted with the Brazil Current, instabilizing it, forming dipoles with the current cyclonic meanders, leading to their downstream propagation. Ancienter cyclonic eddies within Santos Basin may interfere with the propagation of the large anticyclones further south. In addition, the continuous arrival of remotely-originated anticyclones, the larger portion over the São Paulo Plateau presented a tendency of counter-clockwise circulation during the whole cruise period.","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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