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Effects of upwelling, tides and biological processes on the inorganic carbon system of a coastal lagoon in Baja California

Effects of upwelling, tides and biological processes on the inorganic carbon system of a coastal lagoon in Baja California
Effects of upwelling, tides and biological processes on the inorganic carbon system of a coastal lagoon in Baja California
The role of coastal lagoons and estuaries as sources or sinks of inorganic carbon in upwelling areas has not been fully understood. During the months of May–July, 2005, we studied the dissolved inorganic carbon system in a coastal lagoon of northwestern Mexico during the strongest period of upwelling events. Along the bay, different scenarios were observed for the distributions of pH, dissolved inorganic carbon (DIC) and apparent oxygen utilization (AOU) as a result of different combinations of upwelling intensity and tidal amplitude. DIC concentrations in the outer part of the bay were controlled by mixing processes. At the inner part of the bay DIC was as low as 1800 ?mol kg?1, most likely due to high water residence times and seagrass CO2 uptake. It is estimated that 85% of San Quintín Bay, at the oceanic end, acted as a source of CO2 to the atmosphere due to the inflow of CO2-rich upwelled waters from the neighboring ocean with high positive fluxes higher than 30 mmol C m?2 d?1. In contrast, there was a net uptake of CO2 and HCO3? by the seagrass bed Zostera marina in the inner part of the bay, so the pCO2 in this zone was below the equilibrium value and slightly negative CO2 fluxes of ?6 mmol C m?2 d?1. Our positive NEP and ?DIC values indicate that Bahía San Quintín was a net autotrophic system during the upwelling season during 2005.
Dissolved Inorganic carbon, pCO2, coastal upwelling, seagrass, Baja California
0272-7714
367-376
Ribas-Ribas, M.
85a1f816-cfbd-4a9d-83ff-28611827edcd
Hernández-Ayón, J.M.
1f7a15fa-54f5-4997-b4e2-1240825a2d96
Camacho-Ibar, V.F.
ad215591-1f33-41d3-bb8c-103d5592e683
Cabello-Pasini, A.
a7c9497e-0894-4efd-9929-7d0a132ba1f4
Mejia-Trejo, A.
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Durazo, R.
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Galindo-Bect, S.
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Souza, A.J.
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Forja, J.M.
23bfbded-7d76-448a-b7c7-1917ad26dd60
Siqueiros-Valencia, A.
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Ribas-Ribas, M.
85a1f816-cfbd-4a9d-83ff-28611827edcd
Hernández-Ayón, J.M.
1f7a15fa-54f5-4997-b4e2-1240825a2d96
Camacho-Ibar, V.F.
ad215591-1f33-41d3-bb8c-103d5592e683
Cabello-Pasini, A.
a7c9497e-0894-4efd-9929-7d0a132ba1f4
Mejia-Trejo, A.
0d239696-3abd-4617-8071-caac94183919
Durazo, R.
521510b6-5971-4dd9-a3af-8272a9eb7a36
Galindo-Bect, S.
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Souza, A.J.
f3d4f618-af1d-42c2-a14b-8d07be4a854c
Forja, J.M.
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Siqueiros-Valencia, A.
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Ribas-Ribas, M., Hernández-Ayón, J.M., Camacho-Ibar, V.F., Cabello-Pasini, A., Mejia-Trejo, A., Durazo, R., Galindo-Bect, S., Souza, A.J., Forja, J.M. and Siqueiros-Valencia, A. (2011) Effects of upwelling, tides and biological processes on the inorganic carbon system of a coastal lagoon in Baja California. Estuarine, Coastal and Shelf Science, 95 (4), 367-376. (doi:10.1016/j.ecss.2011.09.017).

Record type: Article

Abstract

The role of coastal lagoons and estuaries as sources or sinks of inorganic carbon in upwelling areas has not been fully understood. During the months of May–July, 2005, we studied the dissolved inorganic carbon system in a coastal lagoon of northwestern Mexico during the strongest period of upwelling events. Along the bay, different scenarios were observed for the distributions of pH, dissolved inorganic carbon (DIC) and apparent oxygen utilization (AOU) as a result of different combinations of upwelling intensity and tidal amplitude. DIC concentrations in the outer part of the bay were controlled by mixing processes. At the inner part of the bay DIC was as low as 1800 ?mol kg?1, most likely due to high water residence times and seagrass CO2 uptake. It is estimated that 85% of San Quintín Bay, at the oceanic end, acted as a source of CO2 to the atmosphere due to the inflow of CO2-rich upwelled waters from the neighboring ocean with high positive fluxes higher than 30 mmol C m?2 d?1. In contrast, there was a net uptake of CO2 and HCO3? by the seagrass bed Zostera marina in the inner part of the bay, so the pCO2 in this zone was below the equilibrium value and slightly negative CO2 fluxes of ?6 mmol C m?2 d?1. Our positive NEP and ?DIC values indicate that Bahía San Quintín was a net autotrophic system during the upwelling season during 2005.

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Published date: 20 December 2011
Keywords: Dissolved Inorganic carbon, pCO2, coastal upwelling, seagrass, Baja California
Organisations: Ocean Biochemistry & Ecosystems

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Local EPrints ID: 337377
URI: http://eprints.soton.ac.uk/id/eprint/337377
ISSN: 0272-7714
PURE UUID: f32d7821-ad68-4fc1-b447-04b6ae378de9

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Date deposited: 24 Apr 2012 09:57
Last modified: 16 Jul 2019 22:07

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Contributors

Author: M. Ribas-Ribas
Author: J.M. Hernández-Ayón
Author: V.F. Camacho-Ibar
Author: A. Cabello-Pasini
Author: A. Mejia-Trejo
Author: R. Durazo
Author: S. Galindo-Bect
Author: A.J. Souza
Author: J.M. Forja
Author: A. Siqueiros-Valencia

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