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dc.contributor.author
Carbajal, Juan Cruz  
dc.contributor.author
Chavanne, Cédric  
dc.date.available
2024-03-19T14:42:30Z  
dc.date.issued
2023-07  
dc.identifier.citation
Carbajal, Juan Cruz; Chavanne, Cédric; The role of the low-salinity, high-nitrate layer as a novel lateral mechanism for nutrient supply into the San Jorge Gulf (Patagonian Shelf) during mid-summer; Pergamon-Elsevier Science Ltd; Continental Shelf Research; 264; 105054; 7-2023; 1-11  
dc.identifier.issn
0278-4343  
dc.identifier.uri
http://hdl.handle.net/11336/230921  
dc.description.abstract
The San Jorge Gulf (Patagonian Shelf) is productive in the surface layer mainly in three regions during summer associated with small-scale coastal fronts controlled by interaction with islands to the NE, with coastal upwelling to the SW due to the wind, and with the dynamics of the Southern Tidal Front at the gulf mouth. In early February 2014, a time series of the water column characteristics were performed with a Conductivity-Temperature-Depth (CTD)/rosette package and a vessel hull-mounted acoustic Doppler current profiler (ADCP)over two complete semidiurnal cycles in a quasi-fixed location of the San Jorge Gulf mouth in order to evaluate interaction mechanisms between the surface mixed layer and interior layers that condition the distribution of properties. The pycnocline thickness defined by 24.90 kg m−3 < 0 < 25.50 kg m−3 is driven by the semidiurnal tide, with a mean modulation of 32.7 m amplitude during a 2.75 m sea-level oscillation (R2 = 0.75). Patchy cores of minimum salinity ( ∼ 33.10) with high nitrate concentrations (9.9 mmol m−3, on average) were found at the pycnocline centre (38.0 m ± 4.5 m) during the flood as pulses of sub-surface water betweenconsecutive high tides. Also, a high correlation (R2 = 0.88) was found between the thickness of the low-salinity layer ( < 33.20) and the pycnocline thickness. A clear mode-1 internal tide of semidiurnal frequency was identified during the time series with some non-linear features in the first tidal cycle. As a consequence, a difference in the reversal of the internal tide was seen during both tidal cycles. The water column decreases its stratification when the low-salinity water enters the gulf due to a widening of the pycnocline thickness. At the same time, moderately high nitrate concentrations are observed in the surface mixed layer, suggesting a novel lateral mechanism to maintain the surface chlorophyll layer observed during mid-summer.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Pergamon-Elsevier Science Ltd  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
semidiurnal tide  
dc.subject
low-salinity waters  
dc.subject
nitrate  
dc.subject
internal tide  
dc.subject.classification
Oceanografía, Hidrología, Recursos Hídricos  
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente  
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS  
dc.title
The role of the low-salinity, high-nitrate layer as a novel lateral mechanism for nutrient supply into the San Jorge Gulf (Patagonian Shelf) during mid-summer  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2024-03-08T15:19:55Z  
dc.journal.volume
264  
dc.journal.number
105054  
dc.journal.pagination
1-11  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Carbajal, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina  
dc.description.fil
Fil: Chavanne, Cédric. Université du Québec a Montreal; Canadá  
dc.journal.title
Continental Shelf Research  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0278434323001310  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.csr.2023.105054