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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| Format: | Article |
| Language: | English |
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Universidad Autónoma de Baja California
2003-03-01
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| Series: | Ciencias Marinas |
| Subjects: | |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168 |
| _version_ | 1797279366299779072 |
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| author | JM Forja T Ortega R Ponce M De-la-Paz JA Rubio A. Gómez-Parra |
| author_facet | JM Forja T Ortega R Ponce M De-la-Paz JA Rubio A. Gómez-Parra |
| author_sort | JM Forja |
| collection | DOAJ |
| 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.
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| first_indexed | 2024-03-07T16:24:14Z |
| format | Article |
| id | doaj.art-0a435387cf06498c9bab62579fca5e94 |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:24:14Z |
| publishDate | 2003-03-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-0a435387cf06498c9bab62579fca5e942024-03-03T19:18:15ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532003-03-0129410.7773/cm.v29i4.168Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain)JM Forja0T Ortega1R Ponce2M De-la-Paz3JA Rubio4A. Gómez-ParraUniversidad de CádizUniversidad de CádizUniversidad de CádizUniversidad de CádizUniversidad de Cádiz 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. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168tidal exchangebenthic fluxesnutrientsinorganic carboncoastal salt marshes |
| spellingShingle | JM Forja T Ortega R Ponce M De-la-Paz JA Rubio A. Gómez-Parra Tidal transport of inorganic carbon and nutrients in a coastal salt marsh (Bay of Cádiz, SW Spain) Ciencias Marinas tidal exchange benthic fluxes nutrients inorganic carbon coastal salt marshes |
| title | 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_short | 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 cadiz sw spain |
| topic | tidal exchange benthic fluxes nutrients inorganic carbon coastal salt marshes |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/168 |
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