Abstract
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.
Highlights
Las variaciones de los flujos de COZ a través de la interfase océano-atmósfera son un componente importante del ciclo biogeoquímico del carbono
Estos últimos autores describieron una modulación quincenal de los gradientes de temperatura superficial, con una fuerte disminución de temperatura dos a tres días después de la marea más amplia
The objective of this work is to describe the effect of mixing by spring and neap tides on the surface pH and pCO, and on the CO, air-sea exchange, in the region of the midrift islands of the Gulf of California
Summary
Las variaciones de los flujos de COZ a través de la interfase océano-atmósfera son un componente importante del ciclo biogeoquímico del carbono. La diferencia entre la pCOI del agua y la del aire define áreas de entrada o emisión de CO, hacia o desde el océano (Wong y Chan, 1991). Los amplios intervalos de marea (>4 m) causan fuerte mezcla vertical en la región de las grandes islas del Golfo de California Gaxiola-Castro et al (1978) estudiaron el sistema del CO, del Golfo de California y reportaron que los más bajos valores superficiales de pH y los más altos de concentración total de COZ se presentan en la región de las grandes islas. Zirino y Lieberman (1985) concluyeron que la correlación positiva entre pH y temperatura superficial del golfo central es causada por la fuerte mezcla y acumulación de CO, en las aguas superficiales
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