Phytoplankton biomass and primary productivity by size classes in the Gulf of Tehuantepec, México

Robles-Jarero, Elva Guadalupe; Lara-Lara, José Rubén

doi:10.1093/plankt/15.12.1341

Cited by 22 publications

(6 citation statements)

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“…Por ejemplo, Zeitzschel (1969) reportó valores de PP para condiciones de invierno en el Golfo de California de 300 a 800 mgC m -2 d -1 ; Owen y Zeitzschel (1970) reportaron un ciclo anual medio para el Pacifico tropical oriental de 130 a 320 mgC m -2 d -1 , con valores máximos de PP en primavera y un pico secundario en verano; Gaxiola-Castro y Álvarez-Borrego (1986) reportaron tasas de productividad para la entrada del Golfo de California en enero, con un rango de 190 a 1400 mgC m -2 d -1 . También las tasas de PP para primavera son comparables a las reportadas para otras regiones tales como el Golfo de Tehuantepec (Robles-Jarero y Lara-Lara 1993, Fiedler 1994, Lara-Lara y Bazán Guzmán 2005, Fiedler y Talley 2006, López-Calderón et al 2006, Pennington et al 2006, y el sistema de la Corriente de California (Aguirre-Hernández et al 2004, Martínez-Gaxiola et al 2007. Con base en imágenes satelitales del color del océano, la temporada de surgencias en el Golfo de California dura de noviembre a junio del siguiente año (Santamaría-del-Ángel et al 1994), mientras que en el Golfo de Tehuantepec dura de octubre a abril (Lluch-Cota et al 1997), en comparación con nuestra área de estudio donde esta ocurre de enero a junio.…”

Section: Discussionunclassified

Primary productivity observations in the eastern tropical Pacific off Cabo Corrientes, Mexico

et al. 2009

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The in situ primary productivity (PP) and phytoplankton biomass (chlorophyll a concentration, Chla) of the Cabo Corrientes region, in the eastern tropical Pacific off Mexico, were studied using data from three oceanographic cruises (May and November 2002, and June 2003). The coastal region (<60 km) was found to be affected by coastal upwelling, causing phytoplankton biomass and production rates in this region to be up to two times higher than at the offshore stations. The highest surface Chla values were registered in May 2002 (>2 mg m–3), when the mean PP was 361 mgC m–2 d–1. The highest PP values were recorded in June 2003, with a mean value of 447 mgC m–2 d–1, and the lowest in November 2002, with a mean value of 200 mgC m–2 d–1. Satellite ocean color images, supported by our field data, suggest that the area off Cabo Corrientes can be characterized by three periods: (1) a relatively intense upwelling period, with high Chla and PP (spring); (2) an upwelling relaxation period, when the highest PP values of the year were recorded (late spring-early summer); and (3) a summer-fall period, with strong stratification and lowest Chla and PP values. The high PP registered for the region off Cabo Corrientes during the spring season leads us to conclude that this is an area of high fertility, similar to other rich regions in the Pacific Ocean off Mexico.

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Section: Discussionunclassified

Primary productivity observations in the eastern tropical Pacific off Cabo Corrientes, Mexico

et al. 2009

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“…While the eddy-wind interactions intensify the upwelling (downwelling) inside the cyclonic (anticyclonic) vortex, the downwelling inside the anticyclonic vortex is stronger than the upwelling inside the cyclonic vortex, which could reflect asymmetrical wind forcing. Since the Tehuano winds over the gulf play a crucial role in the dynamics [9–12,14], biological productivity [16,21–23], and the ocean-atmosphere flux of the CO 2 [24] of the GT, more detailed and extensive analysis on the influence of the Tehuano winds in the GT should be directed toward advancing our understanding of the complex dynamics of the gulf and the effects of these winds on marine ecosystems. Studies have already been proposed to analyze ocean-atmosphere interactions coupled with numerical modeling [46,47].…”

Section: Discussionmentioning

confidence: 99%

“…The cyclonic vortex, in its journey to the west, interacts with the coastline, tends to attenuate, and disappears. The findings of this study contribute to understand of the dynamics of the GT, where Tehuano wind effects play a crucial role in sub-surface water pumping, favoring biological productivity [16,21–23] and the ocean-atmosphere flux of CO 2 [24].…”

Section: Introductionmentioning

confidence: 99%

Dipole-wind interactions under gap wind jet conditions in the Gulf of Tehuantepec, Mexico: A surface drifter and satellite database analysis

2019

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Gap wind jets (Tehuano winds) trigger supersquirts of colder water and mesoscale asymmetric dipoles in the Gulf of Tehuantepec (GT). However, the effects of successive gap wind jets on dipoles and their effects inside eddies have not yet been studied. Based on the wind fields, geostrophic currents, and surface drifter dispersion, this research documented three dipoles triggered and modified by Tehuano winds. Once a dipole develops, successive gap wind jets strengthen the vortices, and the anticyclonic eddy migrates southwestward while the cyclonic eddy is maintained on the east side of the GT. During the wind relaxation stage, the cyclonic eddy may propagate westward, but due to the subsequent re-intensification of the Tehuano winds, the vortex could break down, as was suggested by surface drifter dispersion pattern and geostrophic field data. The effect of the Tehuano winds was evaluating via eddy-Ekman pumping. Under Tehuano wind conditions, Ekman downwelling (upwelling) inside the anticyclonic (cyclonic) eddies may reach ~ -2.0 (0.5) m d-1 and decrease as the wind weakens. In the absence of Tehuano winds, Ekman downwelling inside the anticyclonic eddy was ~ 0.1 (-0.1) m d-1. The asymmetry of downwelling and upwelling inside eddies during Tehuano wind events may be associated with Tehuano wind forcing.

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“…1c), the wind perpendicular to the coast facilitates the movement of the surface water seaward. The surface water is replaced by cold, subsurface, nutrient-rich water that fertilizes the euphotic zone and supports the region's primary and secondary production from November to April [3,10,23]. In regions where upwelling is present throughout the year, nutrients tend to be unlimited and primary production levels are generally high.…”

Section: Introductionmentioning

confidence: 99%

Satellite observations of the effect of the “Godzilla El Niño” on the Tehuantepec upwelling system in the Mexican Pacific

2019

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During 2015-2016, a strong El Niño, the "Godzilla El Niño, " which is similar to El Niño events that occurred in 1982/1983 and 1997/1998, occurred in the Pacific Ocean. In this paper, we report on the influence of the "Godzilla El Niño" on the sea surface temperature (SST) and chlorophyll-a (Chla) concentrations in the Tehuantepec upwelling system using satellite observation data. A time-series of the SST and Chla levels in a circular site with a diameter of approximately 54 km centered at the fixed position (15°N, 94.75°W) for the period from January 2003 to December 2016 was obtained using a Moderate Resolution Imaging Spectroradiometer. To estimate the vertical water velocity, a wind velocity time series was obtained from the Copernicus Marine Environment Monitoring Service to assess its variation over the period from January 2014 to December 2016. The results showed unusually high SSTs (> 28 °C) and atypically low Chla concentrations (< 0.1 mg m −3) in the domain of interest during the winter of 2015/2016. In the region of study, the SST in January 2016 was 5.13 °C higher than it had been in January of 2015, whereas the Chla concentration was 1.56 mg m −3 lower over this period. We found that the "Godzilla El Niño" impacted the Tehuantepec upwelling system in the following ways: (1) the wind and vertical water velocity during the winter of 2015/2016 were slightly higher than those observed during the winters of 2013/2014 and 2014/2015; (2) the coastal SST values were elevated during the winter of 2015/2016 compared to their levels during the previous two winters, revealing nutrientpoor water advection; and (3) the Chla concentrations during the 2015/2016 winter season were unusually low compared to their levels during the previous two winters. Our interpretation of these results is that in the Tehuantepec Gulf the wind was strong and induced vertical water velocities reaching up to 6 m day −1 during the "Godzilla El Niño" event (winter 2015/2016); however, the levels of Chla during this period were lower than they had been in previous years. In particular, the levels were lower than they had been during the previous winters. This suggests that, although the wind during the event favored strong upwelling, the water that was advected to the upper layer was nutrient poor.

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Phytoplankton biomass and primary productivity by size classes in the Gulf of Tehuantepec, México

Cited by 22 publications

References 0 publications

Primary productivity observations in the eastern tropical Pacific off Cabo Corrientes, Mexico

Primary productivity observations in the eastern tropical Pacific off Cabo Corrientes, Mexico

Dipole-wind interactions under gap wind jet conditions in the Gulf of Tehuantepec, Mexico: A surface drifter and satellite database analysis

Satellite observations of the effect of the “Godzilla El Niño” on the Tehuantepec upwelling system in the Mexican Pacific

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