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Resumen del producto
Márquez-Artivia, A., L., Sánchez-Velasco, E., Barton, A., Paulmier, E., Santamaría-del-Ángel & E., Beier
(2019).
A suboxic chlorophyll-a maximum persists within the Pacific oxygen minimum zone off Mexico.
Deep-Sea Research Part II: Topical Studies in Oceanography.
169-170: 104686.
DOI: https://doi.org/10.1016/j.dsr2.2019.104686.
A suboxic chlorophyll-a maximum persists within the Pacific oxygen minimum zone off Mexico
Amaru Márquez-Artivia 1, Laura Sánchez-Velasco 2, Eric Barton 3, Aurelien Paulmier 4, Eduardo Santamaría-del-Ángel 5 y Emilio Beier 6
1 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Departamento de Plancton y Ecología Marina
2 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, partamento de Plancton y Ecología Marina
3 Instituto de Investigaciones Marinas, Departamento de Oceanografía, Consejo Superior de Investigaciones Marinas
4 Universidad e Toulouse
5 Universidad Autónoma de Baja California, Facultad de Ciencias Marinas
6 Centro de Investigación Científica y de Educación Superior de Ensenada, Unidad La Paz
The tropical Oxygen Minimum Zones (OMZ) are known to shelter a chlorophyll-a maximum (CM) within suboxic waters (<20 µmol kg-1), below other chlorophyll-a maxima and with an unknown temporal variability in the Pacific OMZ off Mexico. Here, 1161 chlorophyll-a fluorescence and oxygen profiles collected between 2003 and 2016 were used to describe statistically the physical situation in which the suboxic-CM was found. Results indicate that the suboxic-CM was a persistent feature at seasonal scale at depths between 40 and 190 m at an average density potential anomaly of 26 ± 0.2 kg m-3, related to the Subtropical Subsurface Water, which is nearly unaffected by mixing with other water masses. The suboxic-CM south of 21°N was generally associated with the upper limit of the suboxic waters of the OMZ. In this region, the distance between the suboxic waters and the euphotic zone (1% of surface irradiance) was > - 25 m year-round, which suggests that persistent low-light levels allow development of the suboxic-CM. The persistence of the suboxic-CM is consistent with its association with a stable microbial community. The effects on the ecosystem and biogeochemical cycles remain to be investigated.
Palabras clave: Chlorophyll maxima; suboxia; Persistence; euphotic zone; Mexican Pacific
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