Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)

Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)

The Bay of Cádiz is surrounded by a broad zone of salt marshes that exchange water through a seawater channel 18 km in length (the Sancti Petri Channel). These littoral zones are characterized by their extreme shallowness (with a mean depth of less than 1 m) and their high content of organic matter,...

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প্রধান লেখক: Forja, JM, Ortega, T, Ponce, R, De-la-Paz, M, Rubio, JA, Gómez-Parra, A.
বিন্যাস: Online
ভাষা:eng
প্রকাশিত: Iniversidad Autónoma de Baja California 2003
অনলাইন ব্যবহার করুন:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168
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id oai:cienciasmarinas.com.mx:article-168
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Forja, JM
Ortega, T
Ponce, R
De-la-Paz, M
Rubio, JA
Gómez-Parra, A.
spellingShingle Forja, JM
Ortega, T
Ponce, R
De-la-Paz, M
Rubio, JA
Gómez-Parra, A.
Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)
author_facet Forja, JM
Ortega, T
Ponce, R
De-la-Paz, M
Rubio, JA
Gómez-Parra, A.
author_sort Forja, JM
title Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)
title_short Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)
title_full Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)
title_fullStr Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)
title_full_unstemmed Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)
title_sort tidal transport of inorganic carbon and nutrients in a coastal salt marsh (bay of cádiz, sw spain)
description The Bay of Cádiz is surrounded by a broad zone of salt marshes that exchange water through a seawater channel 18 km in length (the Sancti Petri Channel). These littoral zones are characterized by their extreme shallowness (with a mean depth of less than 1 m) and their high content of organic matter, which in relative terms is highest in the surface sediments (between 1.2% and 2.6% organic carbon). Under these conditions, an intensive benthic regeneration of nutrients takes place, with mean fluxes in the zone of 83.2 ± 36.9 mmol m–2 d–1 of inorganic carbon, 6.36 ± 4.56 mmol m–2 d–1 of NH4+, 1.14 ± 0.56 mmol m–2 d–1 of HPO4 2– and 4.54 ± 2.25 mmol m–2 d–1 of SiO2. A proportion of these nutrients and inorganic carbon produced make their way through secondary channels to the Sancti Petri Channel, and the material is later transported by the tides to the Bay of Cádiz and other bordering littoral zones. In this work, the concentrations of inorganic carbon and nutrients (NH4+, NO2–, NO3–, HPO42– and SiO2) have been determined at three different depths, every hour, during complete tidal cycles. Simultaneously, the current velocities at different depths have been measured continuously. From this set of experimental data, calculations have been made of the evolution of the instantaneous velocities of these substances at each end of the channel, and by integration, the net balance for the complete tidal cycle. In general terms, there is an export of inorganic carbon and nutrients with the tides, although the net transports are very variable and depend to a large extent on the hydrodynamics of the zone. The results obtained correlate with balances previously made in the Bay of Cádiz.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168
_version_ 1715723938364915712
spelling oai:cienciasmarinas.com.mx:article-1682019-04-24T20:43:53Z Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain) Transporte con las mareas de carbono inorgánico y nutrientes en una marisma litoral (Bahía de Cádiz, SO de España) Forja, JM Ortega, T Ponce, R De-la-Paz, M Rubio, JA Gómez-Parra, A. tidal exchange benthic fluxes nutrients inorganic carbon coastal salt marshes intercambio con las mareas flujos bentónicos nutrientes carbono inorgánico marismas costeras The Bay of Cádiz is surrounded by a broad zone of salt marshes that exchange water through a seawater channel 18 km in length (the Sancti Petri Channel). These littoral zones are characterized by their extreme shallowness (with a mean depth of less than 1 m) and their high content of organic matter, which in relative terms is highest in the surface sediments (between 1.2% and 2.6% organic carbon). Under these conditions, an intensive benthic regeneration of nutrients takes place, with mean fluxes in the zone of 83.2 ± 36.9 mmol m–2 d–1 of inorganic carbon, 6.36 ± 4.56 mmol m–2 d–1 of NH4+, 1.14 ± 0.56 mmol m–2 d–1 of HPO4 2– and 4.54 ± 2.25 mmol m–2 d–1 of SiO2. A proportion of these nutrients and inorganic carbon produced make their way through secondary channels to the Sancti Petri Channel, and the material is later transported by the tides to the Bay of Cádiz and other bordering littoral zones. In this work, the concentrations of inorganic carbon and nutrients (NH4+, NO2–, NO3–, HPO42– and SiO2) have been determined at three different depths, every hour, during complete tidal cycles. Simultaneously, the current velocities at different depths have been measured continuously. From this set of experimental data, calculations have been made of the evolution of the instantaneous velocities of these substances at each end of the channel, and by integration, the net balance for the complete tidal cycle. In general terms, there is an export of inorganic carbon and nutrients with the tides, although the net transports are very variable and depend to a large extent on the hydrodynamics of the zone. The results obtained correlate with balances previously made in the Bay of Cádiz. La Bahía de Cádiz se encuentra rodeada de una amplia zona de marismas que intercambian agua a través de un brazo de mar de 18 km de longitud (Caño de Sancti Petri). Estas zonas litorales se caracterizan por ser muy someras (con una profundidad media inferior a 1 m) y poseer un elevado contenido de materia orgánica relativamente mayor en los sedimentos superficiales (entre 1.2% y 2.6% de carbono orgánico). Bajo estas condiciones, se produce una intensa regeneración bentónica de nutrientes, con flujos medios en la zona de 83.2 ± 36.9 mmol m–2 d–1 de carbono inorgánico, 6.36 ± 4.56 mmol m–2 d–1 de NH4+, 1.14 ± 0.56 mmol m–2 d–1 de HPO42–, y 4.54 ± 2.25 mmol m–2 d–1 de SiO2. Una parte de estos nutrientes y carbono inorgánico producidos acceden a través de canales secundarios hasta el Caño de Sancti Petri, y posteriormente se transporta con las mareas a la Bahía de Cádiz y otras zonas litorales limítrofes. En este trabajo se han determinado las concentraciones de carbono inorgánico y nutrientes (NH4+, NO2–, NO3–, HPO42– y SiO2) a tres profundidades diferentes cada hora durante ciclos de marea completos. Simultáneamente se han medido de forma continua las velocidades de corriente a diferentes profundidades. A partir de este conjunto experimental de datos se ha calculado la evolución de las velocidades instantáneas de estas sustancias en los extremos, y por integración, el balance neto para el ciclo de mareas completo. En líneas generales existe una exportación de carbono inorgánico y nutrientes con las mareas, aunque los transportes netos son muy variables, y dependen en gran medida de la hidrodinámica en la zona. Los resultados obtenidos se relacionan con balances previos realizados en la Bahía de Cádiz. Iniversidad Autónoma de Baja California 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168 10.7773/cm.v29i4.168 Ciencias Marinas; Vol. 29 No. 4 (2003); 469-481 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 469-481 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168/144

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