Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects
Nutrient distributions observed at some depths along the continental shelf from 27°05′S (Brazil) to 39°31′S (Argentina) in winter, 2003 and summer, 2004 related to salinity and dissolved oxygen (mL L-1) and saturation (%) data showed remarkable influences of fresh water discharge over the coastal re...
Guardado en:
| Autor principal: | |
|---|---|
| Publicado: |
2008
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02784343_v28_n13_p1649_Braga http://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga |
| Aporte de: |
| id |
paper:paper_02784343_v28_n13_p1649_Braga |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_02784343_v28_n13_p1649_Braga2023-06-08T15:26:47Z Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects Romero, Silvia Inés Mar del Plata Nutrient distributions Remineralization processes South Atlantic Ocean Terrestrial inputs Upwelling Antarctic Intermediate Water continental shelf dissolved oxygen land-sea interaction nutrient phosphate primary production remineralization salinity shallow water shelf break silicate summer winter Argentina Atlantic Ocean Atlantic Ocean (South) Brazil Buenos Aires [Argentina] Itajai-Acu Estuary Mar del Plata Rio de la Plata Santa Catarina South America Nutrient distributions observed at some depths along the continental shelf from 27°05′S (Brazil) to 39°31′S (Argentina) in winter, 2003 and summer, 2004 related to salinity and dissolved oxygen (mL L-1) and saturation (%) data showed remarkable influences of fresh water discharge over the coastal region and in front of the La Plata estuary. In the southern portion of the study area different processes were verified. Upwelling processes caused by ocean dynamics typical of shelf break areas, eddies related to surface dynamics and regeneration processes confirmed by the increase of nutrients and the decrease of dissolved and saturation oxygen data were verified. High silicate concentrations in the surface waters were identified related to low salinities (minimum of 21.22 in winter and 21.96 in summer), confirming the importance of freshwater inputs in this region, especially in winter. Silicate concentration range showed values between 0.00 and 83.52 μM during winter and from 0.00 to 41.16 μM during summer. Phosphate concentrations worked as a secondary trace of terrestrial input and their values varied from 0.00 to 3.30 μM in winter and from 0.03 to 2.26 μM in summer; however, in shallow waters, phosphate indicated more clearly the fresh water influence. The most important information given by nitrate concentrations was the presence of water from SACW upwelling that represents a new source of nutrients for marine primary production. Nitrate maximum values reached 41.96 μM in winter and 33.10 μM in summer. At a depth ∼800 m, high nitrate, phosphate and silicate concentrations were related to Malvinas Current Waters, Subantarctic Shallow Waters and Antarctic Atlantic Intermediate Waters (AAIW). Dissolved oxygen varied from 3.41 to 7.06 mL L-1 in winter and from 2.65 to 6.85 mL L-1 in summer. The percentage of dissolved oxygen saturation in the waters showed values between 48% and 113% in winter and from 46% to135% in summer. The most important primary production was verified in the summer, and situations of undersaturation were mainly observed below 50 m depth and at some points near the coast. The anti-correlation between nutrients and dissolved oxygen which showed evident undersaturation also revealed important potential sites of remineralization processes. The nutrient behaviours showed some aspects of the processes that occur over the Southwestern South Atlantic continental shelf and in their land-sea interfaces between Mar del Plata and Itajaí. © 2008 Elsevier Ltd. All rights reserved. Fil:Romero, S Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02784343_v28_n13_p1649_Braga http://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Mar del Plata Nutrient distributions Remineralization processes South Atlantic Ocean Terrestrial inputs Upwelling Antarctic Intermediate Water continental shelf dissolved oxygen land-sea interaction nutrient phosphate primary production remineralization salinity shallow water shelf break silicate summer winter Argentina Atlantic Ocean Atlantic Ocean (South) Brazil Buenos Aires [Argentina] Itajai-Acu Estuary Mar del Plata Rio de la Plata Santa Catarina South America |
| spellingShingle |
Mar del Plata Nutrient distributions Remineralization processes South Atlantic Ocean Terrestrial inputs Upwelling Antarctic Intermediate Water continental shelf dissolved oxygen land-sea interaction nutrient phosphate primary production remineralization salinity shallow water shelf break silicate summer winter Argentina Atlantic Ocean Atlantic Ocean (South) Brazil Buenos Aires [Argentina] Itajai-Acu Estuary Mar del Plata Rio de la Plata Santa Catarina South America Romero, Silvia Inés Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects |
| topic_facet |
Mar del Plata Nutrient distributions Remineralization processes South Atlantic Ocean Terrestrial inputs Upwelling Antarctic Intermediate Water continental shelf dissolved oxygen land-sea interaction nutrient phosphate primary production remineralization salinity shallow water shelf break silicate summer winter Argentina Atlantic Ocean Atlantic Ocean (South) Brazil Buenos Aires [Argentina] Itajai-Acu Estuary Mar del Plata Rio de la Plata Santa Catarina South America |
| description |
Nutrient distributions observed at some depths along the continental shelf from 27°05′S (Brazil) to 39°31′S (Argentina) in winter, 2003 and summer, 2004 related to salinity and dissolved oxygen (mL L-1) and saturation (%) data showed remarkable influences of fresh water discharge over the coastal region and in front of the La Plata estuary. In the southern portion of the study area different processes were verified. Upwelling processes caused by ocean dynamics typical of shelf break areas, eddies related to surface dynamics and regeneration processes confirmed by the increase of nutrients and the decrease of dissolved and saturation oxygen data were verified. High silicate concentrations in the surface waters were identified related to low salinities (minimum of 21.22 in winter and 21.96 in summer), confirming the importance of freshwater inputs in this region, especially in winter. Silicate concentration range showed values between 0.00 and 83.52 μM during winter and from 0.00 to 41.16 μM during summer. Phosphate concentrations worked as a secondary trace of terrestrial input and their values varied from 0.00 to 3.30 μM in winter and from 0.03 to 2.26 μM in summer; however, in shallow waters, phosphate indicated more clearly the fresh water influence. The most important information given by nitrate concentrations was the presence of water from SACW upwelling that represents a new source of nutrients for marine primary production. Nitrate maximum values reached 41.96 μM in winter and 33.10 μM in summer. At a depth ∼800 m, high nitrate, phosphate and silicate concentrations were related to Malvinas Current Waters, Subantarctic Shallow Waters and Antarctic Atlantic Intermediate Waters (AAIW). Dissolved oxygen varied from 3.41 to 7.06 mL L-1 in winter and from 2.65 to 6.85 mL L-1 in summer. The percentage of dissolved oxygen saturation in the waters showed values between 48% and 113% in winter and from 46% to135% in summer. The most important primary production was verified in the summer, and situations of undersaturation were mainly observed below 50 m depth and at some points near the coast. The anti-correlation between nutrients and dissolved oxygen which showed evident undersaturation also revealed important potential sites of remineralization processes. The nutrient behaviours showed some aspects of the processes that occur over the Southwestern South Atlantic continental shelf and in their land-sea interfaces between Mar del Plata and Itajaí. © 2008 Elsevier Ltd. All rights reserved. |
| author |
Romero, Silvia Inés |
| author_facet |
Romero, Silvia Inés |
| author_sort |
Romero, Silvia Inés |
| title |
Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects |
| title_short |
Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects |
| title_full |
Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects |
| title_fullStr |
Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects |
| title_full_unstemmed |
Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects |
| title_sort |
nutrient distributions over the southwestern south atlantic continental shelf from mar del plata (argentina) to itajaí (brazil): winter-summer aspects |
| publishDate |
2008 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02784343_v28_n13_p1649_Braga http://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga |
| work_keys_str_mv |
AT romerosilviaines nutrientdistributionsoverthesouthwesternsouthatlanticcontinentalshelffrommardelplataargentinatoitajaibrazilwintersummeraspects |
| _version_ |
1768542503692140544 |