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...
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ftunibueairesbd:todo:paper_02784343_v28_n13_p1649_Braga 2023-10-29T02:31:38+01:00 Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter-summer aspects Braga, E.S. Chiozzini, V.C. Berbel, G. Maluf, J. Aguiar, V. Charo, M. Molina, D. Romero, S Eichler, B.B. https://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga unknown http://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Rio de la Plata Santa Catarina South America JOUR ftunibueairesbd https://doi.org/20.500.12110/paper_02784343_v28_n13_p1649_Braga 2023-10-05T01:22:25Z 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 ... Journal/Newspaper Antarc* Antarctic South Atlantic Ocean Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
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 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 Rio de la Plata Santa Catarina South America Braga, E.S. Chiozzini, V.C. Berbel, G. Maluf, J. Aguiar, V. Charo, M. Molina, D. Romero, S Eichler, B.B. 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 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 ... |
format |
Journal/Newspaper |
author |
Braga, E.S. Chiozzini, V.C. Berbel, G. Maluf, J. Aguiar, V. Charo, M. Molina, D. Romero, S Eichler, B.B. |
author_facet |
Braga, E.S. Chiozzini, V.C. Berbel, G. Maluf, J. Aguiar, V. Charo, M. Molina, D. Romero, S Eichler, B.B. |
author_sort |
Braga, E.S. |
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 |
url |
https://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_relation |
http://hdl.handle.net/20.500.12110/paper_02784343_v28_n13_p1649_Braga |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar |
op_doi |
https://doi.org/20.500.12110/paper_02784343_v28_n13_p1649_Braga |
_version_ |
1781052301619757056 |