Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2
Surface seawater carbon dioxide partial pressure (pCO2) and the CO2 flux through the air-sea interface in the region of the midrift islands of the Gulf of California were estimated. We used surface temperature (ºC), salinity and pH data collected during summer 1990, and we assumed a constant specifi...
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Iniversidad Autónoma de Baja California
1997
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oai:cienciasmarinas.com.mx:article-8132019-05-22T20:42:02Z Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 Mezcla en la región de las grandes islas del Golfo de California: efecto en la pCO2 superficial Hidalgo-González, R Álvarez-Borrego, S Zirino, A Gulf of California tidal mixing surface pCO2 air-sea exchange Golfo de California mezcla por mareas pC02 superficial intercambio mar-aire Surface seawater carbon dioxide partial pressure (pCO2) and the CO2 flux through the air-sea interface in the region of the midrift islands of the Gulf of California were estimated. We used surface temperature (ºC), salinity and pH data collected during summer 1990, and we assumed a constant specific alkalinity value. Mixing by tide-related phenomena is particularly strong in this region of the gulf, and our objective was to compare the effect of post-spring tides with that of post-neap tides. Carbon dioxide was either near equilibrium or flowing from the water to the atmosphere, even with post-neap tides. Surface cooling, and larger pCO2 and CO2 flux were detected with post-spring tides. relative to post-neap tides (<4 mM m–2 d–1 with post-neap tides. up to 23 mM m–2 d–1 with post-spring tides). There is a fortnightly modulation of the CO2 system in the surface waters of this region due to the spring-neap tide sequence. Tidal mixing is a “physical pump” that carries CO2 efficiently from intermediate depths (500 m) to the atmosphere in this region of the gulf. La presión parcial del bióxido de carbono (pCO2) y el flujo de CO2 a través de la interfase aireagua se estimó para la región de las grandes islas del Golfo de California. Para ello, se utilizaron datos de temperatura (ºC), salinidad y pH superficial, recolectados durante el verano de 1990, y se supuso un valor de alcalinidad específica constante. La mezcla por fenómenos asociados con las mareas es particularmente fuerte en esta región del golfo, y nuestro objetivo fue el comparar el efecto de las mareas posvivas con el de las posmuertas. El CO2, estuvo cerca del equilibrio o fluyendo del agua hacia el aire, aun con mareas posmuertas. El enfriamiento superficial asociado con las mareas posvivas, con relación a las posmuertas, se presentó con un incremento de la pCO2, y del flujo calculado de CO2, hacia la atmósfera (<4 mM m–2 d–1 en mareas posmuertas hasta 23 mM m–2 d–1 en posvivas). Existe una modulación quincenal de las variables del CO2, en las aguas superficiales de esta región debido a la secuencia de las mareas vivas y muertas. La mezcla por mareas es una “bomba física” que acarrea CO2, eficientemente de profundidades intermedias (500 m) a la atmósfera en esta región del golfo. Iniversidad Autónoma de Baja California 1997-03-06 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/813 10.7773/cm.v23i3.813 Ciencias Marinas; Vol. 23 No. 3 (1997); 317-327 Ciencias Marinas; Vol. 23 Núm. 3 (1997); 317-327 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/813/739 |
| institution |
Ciencias Marinas |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Hidalgo-González, R Álvarez-Borrego, S Zirino, A |
| spellingShingle |
Hidalgo-González, R Álvarez-Borrego, S Zirino, A Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 |
| author_facet |
Hidalgo-González, R Álvarez-Borrego, S Zirino, A |
| author_sort |
Hidalgo-González, R |
| title |
Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 |
| title_short |
Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 |
| title_full |
Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 |
| title_fullStr |
Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 |
| title_full_unstemmed |
Mixing in the region of the midrift islands of the Gulf of California: effect on surface pCO2 |
| title_sort |
mixing in the region of the midrift islands of the gulf of california: effect on surface pco2 |
| description |
Surface seawater carbon dioxide partial pressure (pCO2) and the CO2 flux through the air-sea interface in the region of the midrift islands of the Gulf of California were estimated. We used surface temperature (ºC), salinity and pH data collected during summer 1990, and we assumed a constant specific alkalinity value. Mixing by tide-related phenomena is particularly strong in this region of the gulf, and our objective was to compare the effect of post-spring tides with that of post-neap tides. Carbon dioxide was either near equilibrium or flowing from the water to the atmosphere, even with post-neap tides. Surface cooling, and larger pCO2 and CO2 flux were detected with post-spring tides. relative to post-neap tides (<4 mM m–2 d–1 with post-neap tides. up to 23 mM m–2 d–1 with post-spring tides). There is a fortnightly modulation of the CO2 system in the surface waters of this region due to the spring-neap tide sequence. Tidal mixing is a “physical pump” that carries CO2 efficiently from intermediate depths (500 m) to the atmosphere in this region of the gulf. |
| publisher |
Iniversidad Autónoma de Baja California |
| publishDate |
1997 |
| url |
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/813 |
| _version_ |
1715724014671888384 |
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