Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses
| Autor(a) principal: | |
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| Data de Publicação: | 2022 |
| Outros Autores: | , , , , , , , |
| Tipo de documento: | Artigo |
| Idioma: | eng |
| Título da fonte: | Anuário do Instituto de Geociências (Online) |
| Texto Completo: | https://revistas.ufrj.br/index.php/aigeo/article/view/45732 |
Resumo: | Water masses are commonly identified according to their conservative parameters. However, there are also studies that use non-conservative parameters, together with the conservative ones, to refine the water masses identification. The aim of this study was to analyze the chemical properties of the water masses in the western tropical Atlantic Ocean (WTAO) according to their inorganic nutrient concentration: nitrate-NO3–, phosphate-PO43–, and silicic acid-Si(OH)4, to set a regional descriptive framework of the water column in view of future comparative studies. We collected full-depth water column samples from 18 oceanographic stations from a latitudinal transect along 38°W, from 02°S to 15°N during the PIRATA-BR XVII and XVIII campaigns, in November 2017 and 2018. We have also used the regional data available from GLODAPv.2 data product to improve the water masses characterization. Six water masses were identified in the region based on their values of potential temperature, salinity, potential density, and neutral density observed in the study area according to the CTD-O2 data: Tropical Surface Water (TSW); South and North Atlantic Central Water (SACW and NACW, respectively); Antarctic Intermediate Water (AAIW); North Atlantic Deep Water (NADW); and Antarctic Bottom Water (AABW). Regarding the nutrient content within each water mass, our results showed that TSW corresponds to a surface oligotrophic water; NACW and SACW have intermediate nutrient concentration values between TSW and AAIW; AAIW showed the highest concentration of phosphate-PO43– (~ 1.35 µmol kg–1) and nitrate-NO3– (~30 µmol kg–1); AABW, on the other hand, was the water mass with the highest silicic acid-Si(OH)4 concentration (~ 80 µmol kg–1), as well as high nitrate-NO3– (~ 25 µmol kg–1) and phosphate-PO43– (~ 1.80 µmol kg–1) concentrations. Additionally, the water column between 300 and 650 m displays an increase in phosphate-PO43– concentrations north of 5oN, associated to a low dissolved oxygen area coupled to the North Equatorial Under Current (NEUC). Long-term, sustained hydrographic and ocean biogeochemistry observations are key to understand how climate change is affecting the ocean, and this study is a contribution to that. |
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Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water MassesInorganic nutrients; Antarctic Intermediate Water (AAIW); Antarctic Bottom Water (AABW)Water masses are commonly identified according to their conservative parameters. However, there are also studies that use non-conservative parameters, together with the conservative ones, to refine the water masses identification. The aim of this study was to analyze the chemical properties of the water masses in the western tropical Atlantic Ocean (WTAO) according to their inorganic nutrient concentration: nitrate-NO3–, phosphate-PO43–, and silicic acid-Si(OH)4, to set a regional descriptive framework of the water column in view of future comparative studies. We collected full-depth water column samples from 18 oceanographic stations from a latitudinal transect along 38°W, from 02°S to 15°N during the PIRATA-BR XVII and XVIII campaigns, in November 2017 and 2018. We have also used the regional data available from GLODAPv.2 data product to improve the water masses characterization. Six water masses were identified in the region based on their values of potential temperature, salinity, potential density, and neutral density observed in the study area according to the CTD-O2 data: Tropical Surface Water (TSW); South and North Atlantic Central Water (SACW and NACW, respectively); Antarctic Intermediate Water (AAIW); North Atlantic Deep Water (NADW); and Antarctic Bottom Water (AABW). Regarding the nutrient content within each water mass, our results showed that TSW corresponds to a surface oligotrophic water; NACW and SACW have intermediate nutrient concentration values between TSW and AAIW; AAIW showed the highest concentration of phosphate-PO43– (~ 1.35 µmol kg–1) and nitrate-NO3– (~30 µmol kg–1); AABW, on the other hand, was the water mass with the highest silicic acid-Si(OH)4 concentration (~ 80 µmol kg–1), as well as high nitrate-NO3– (~ 25 µmol kg–1) and phosphate-PO43– (~ 1.80 µmol kg–1) concentrations. Additionally, the water column between 300 and 650 m displays an increase in phosphate-PO43– concentrations north of 5oN, associated to a low dissolved oxygen area coupled to the North Equatorial Under Current (NEUC). Long-term, sustained hydrographic and ocean biogeochemistry observations are key to understand how climate change is affecting the ocean, and this study is a contribution to that.Universidade Federal do Rio de JaneiroCAPESVieira, Renan Evangelistada Cunha, Leticia CotrimPinho, Luana KeirozFernandes, Alexandre Macedodos Santos, Raquel da ConceicaoKeim, Ricardo de Almeidade Assis, Carlos MusettiFranklin, Thiago VelosoNogueira, Jessica da Silva2022-07-26info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/4573210.11137/1982-3908_2022_45_45732Anuário do Instituto de Geociências; Vol 45 (2022)Anuário do Instituto de Geociências; Vol 45 (2022)1982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJenghttps://revistas.ufrj.br/index.php/aigeo/article/view/45732/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/45732/SUPPhttps://revistas.ufrj.br/index.php/aigeo/article/downloadSuppFile/45732/18916/*ref*/Arhan, M., Mercier, H., Bourlès, B. & Gouriou, Y. 1998, ‘Hydrographic sections across the Atlantic at 7°30N and 4°30S’, Deep Sea Research Part I: Oceanographic Research Papers, vol. 45, no. 6, pp. 829–72. https://doi.org/10.1016/S0967-0637(98)00001-6/*ref*/Azaneu, M., Kerr, R., Mata, M.M. & Garcia, C.A.E. 2013, ‘Trends in the deep Southern Ocean (1958-2010): Implications for Antarctic Bottom Water properties and volume export’, Journal of Geophysical Research: Oceans, vol. 118, no. 9, pp. 4213–27. https://doi.org/10.1002/jgrc.20303/*ref*/Azar, E., Piñango, A., Wallner-Kersanach, M. & Kerr, R. 2021, ‘Source waters contribution to the tropical Atlantic central layer: New insights on the Indo-Atlantic exchanges’, Deep Sea Research Part I: Oceanographic Research Papers, vol. 168, p. 103450. https://doi.org/10.1016/j.dsr.2020.103450/*ref*/De Baar, H.J.W., Van Leeuwe, M.A., Scharek, R., Goeyens, L., Bakker, K.M.J. & Fritsche, P. 1997, ‘Nutrient anomalies in Fragilariopsis kerguelensis blooms, iron deficiency and the nitrate/phosphate ratio (A. 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| dc.title.none.fl_str_mv |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| title |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| spellingShingle |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses Vieira, Renan Evangelista Inorganic nutrients; Antarctic Intermediate Water (AAIW); Antarctic Bottom Water (AABW) |
| title_short |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| title_full |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| title_fullStr |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| title_full_unstemmed |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| title_sort |
Biogeochemical Characteristics of Western Tropical Atlantic Ocean Water Masses |
| author |
Vieira, Renan Evangelista |
| author_facet |
Vieira, Renan Evangelista da Cunha, Leticia Cotrim Pinho, Luana Keiroz Fernandes, Alexandre Macedo dos Santos, Raquel da Conceicao Keim, Ricardo de Almeida de Assis, Carlos Musetti Franklin, Thiago Veloso Nogueira, Jessica da Silva |
| author_role |
author |
| author2 |
da Cunha, Leticia Cotrim Pinho, Luana Keiroz Fernandes, Alexandre Macedo dos Santos, Raquel da Conceicao Keim, Ricardo de Almeida de Assis, Carlos Musetti Franklin, Thiago Veloso Nogueira, Jessica da Silva |
| author2_role |
author author author author author author author author |
| dc.contributor.none.fl_str_mv |
CAPES |
| dc.contributor.author.fl_str_mv |
Vieira, Renan Evangelista da Cunha, Leticia Cotrim Pinho, Luana Keiroz Fernandes, Alexandre Macedo dos Santos, Raquel da Conceicao Keim, Ricardo de Almeida de Assis, Carlos Musetti Franklin, Thiago Veloso Nogueira, Jessica da Silva |
| dc.subject.por.fl_str_mv |
Inorganic nutrients; Antarctic Intermediate Water (AAIW); Antarctic Bottom Water (AABW) |
| topic |
Inorganic nutrients; Antarctic Intermediate Water (AAIW); Antarctic Bottom Water (AABW) |
| description |
Water masses are commonly identified according to their conservative parameters. However, there are also studies that use non-conservative parameters, together with the conservative ones, to refine the water masses identification. The aim of this study was to analyze the chemical properties of the water masses in the western tropical Atlantic Ocean (WTAO) according to their inorganic nutrient concentration: nitrate-NO3–, phosphate-PO43–, and silicic acid-Si(OH)4, to set a regional descriptive framework of the water column in view of future comparative studies. We collected full-depth water column samples from 18 oceanographic stations from a latitudinal transect along 38°W, from 02°S to 15°N during the PIRATA-BR XVII and XVIII campaigns, in November 2017 and 2018. We have also used the regional data available from GLODAPv.2 data product to improve the water masses characterization. Six water masses were identified in the region based on their values of potential temperature, salinity, potential density, and neutral density observed in the study area according to the CTD-O2 data: Tropical Surface Water (TSW); South and North Atlantic Central Water (SACW and NACW, respectively); Antarctic Intermediate Water (AAIW); North Atlantic Deep Water (NADW); and Antarctic Bottom Water (AABW). Regarding the nutrient content within each water mass, our results showed that TSW corresponds to a surface oligotrophic water; NACW and SACW have intermediate nutrient concentration values between TSW and AAIW; AAIW showed the highest concentration of phosphate-PO43– (~ 1.35 µmol kg–1) and nitrate-NO3– (~30 µmol kg–1); AABW, on the other hand, was the water mass with the highest silicic acid-Si(OH)4 concentration (~ 80 µmol kg–1), as well as high nitrate-NO3– (~ 25 µmol kg–1) and phosphate-PO43– (~ 1.80 µmol kg–1) concentrations. Additionally, the water column between 300 and 650 m displays an increase in phosphate-PO43– concentrations north of 5oN, associated to a low dissolved oxygen area coupled to the North Equatorial Under Current (NEUC). Long-term, sustained hydrographic and ocean biogeochemistry observations are key to understand how climate change is affecting the ocean, and this study is a contribution to that. |
| publishDate |
2022 |
| dc.date.none.fl_str_mv |
2022-07-26 |
| dc.type.none.fl_str_mv |
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| dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.uri.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/45732 10.11137/1982-3908_2022_45_45732 |
| url |
https://revistas.ufrj.br/index.php/aigeo/article/view/45732 |
| identifier_str_mv |
10.11137/1982-3908_2022_45_45732 |
| dc.language.iso.fl_str_mv |
eng |
| language |
eng |
| dc.relation.none.fl_str_mv |
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Copyright (c) 2022 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
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Copyright (c) 2022 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 |
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openAccess |
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application/pdf application/pdf |
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Universidade Federal do Rio de Janeiro |
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Universidade Federal do Rio de Janeiro |
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Anuário do Instituto de Geociências; Vol 45 (2022) Anuário do Instituto de Geociências; Vol 45 (2022) 1982-3908 0101-9759 reponame:Anuário do Instituto de Geociências (Online) instname:Universidade Federal do Rio de Janeiro (UFRJ) instacron:UFRJ |
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Universidade Federal do Rio de Janeiro (UFRJ) |
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UFRJ |
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UFRJ |
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Anuário do Instituto de Geociências (Online) |
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Anuário do Instituto de Geociências (Online) |
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Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ) |
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anuario@igeo.ufrj.br|| |
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1797053541721833472 |