Effect of the oxygen minimum zone on the second chlorophyll maximum

Main Article Content

J Cepeda-Morales
E Beier
G Gaxiola-Castro
MF Lavín
VM Godínez

Abstract

Field data collected during June 2005 were used to determine the relationship between the second fluorescence maximum (FMax), the top of the oxygen minimum zone (OMZ), and physical processes (coastal currents, eddies, and upwelling) in the northern region of the Eastern Tropical Pacific off Mexico (ETPM). A recurrent second FMax was observed in the ETPM, which was formed only when the upper limit of the OMZ (9.0 µmol L–1) overlapped with the 1% downwelling blue irradiance depth (Ed490). The presence of the second FMax increased the total integrated water column chlorophyll from 20% to 40%. The second FMax was absent from areas where oxygenated California Current Water (CCW) deepened the upper limit of the OMZ below 1% Ed490. The poleward Mexican Coastal Current carried less oxygenated Subtropical Subsurface Water into the area, and enabled the formation of the second FMax. The variability of the second FMax driven by mesoscale physical processes was related to coastal upwelling and cyclonic eddies only in areas not influenced by CCW. 

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How to Cite
Cepeda-Morales, J., Beier, E., Gaxiola-Castro, G., Lavín, M., & Godínez, V. (2009). Effect of the oxygen minimum zone on the second chlorophyll maximum. Ciencias Marinas, 35(4), 389–403. https://doi.org/10.7773/cm.v35i4.1622
Section
Research Article
Author Biography

VM Godínez, Universidad Autónoma de Baja California

Estudiante Doctorado Oceanografia Costera Facultad de cs. marinas UABC- Ensenada

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