https://doi.org/10.4081/aiol.2024.11301
Rossby waves impact on persistent oxic and suboxic chlorophyll maxima in the Eastern Tropical North Pacific
Submitted: 9 March 2023
Accepted: 3 June 2024
Published: 19 September 2024
Accepted: 3 June 2024
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This study aims to describe the response of two persistent chlorophyll-a maxima to physical processes that affect the po- sition of the thermocline/nitracline in the Eastern Tropical North Pacific (ETNP). We focused on Long Rossby Waves (LRWs) due to their relevance to the ETNP circulation and their potential role in introducing nutrients into the euphotic zone. We found that the shallower chlorophyll-a maximum in oxygenated waters became more intense when denser waters (containing more nu- trients) moved toward the surface. This suggests that changes in isopycnals and nitracline displacements modify nutrient supply in the euphotic zone, leading to changes in phytoplankton growth. The suboxic and deeper chlorophyll-a maximum showed a strong association with the 26 kg m-3 isopycnal, which was only mechanically displaced, and its chlorophyll-a content did not seem to covary with irradiance or nutrients. The decor- related responses of the chlorophyll-a maxima could be ex- plained if different phytoplankton groups are associated with them. LRWs can affect the position of the thermocline/nitracline and isopycnals in an annual cycle, but it seems to be a “back- ground” signal modulated by higher frequency processes such as mesoscale eddies and other Rossby waves. The co-occurrence of processes can control the nitracline depth, and thus the input of nutrients into the euphotic zone, leading to sporadic enhance- ments in chlorophyll-a concentration in one maximum.
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How to Cite
Márquez-Artavia, A., Márquez-Artavia, X., Salazar-Ceciliano, J. P., Sánchez-Velasco, L., Beier, E., & Paulmier, A. (2024). Rossby waves impact on persistent oxic and suboxic chlorophyll maxima in the Eastern Tropical North Pacific. Advances in Oceanography and Limnology, 15(1). https://doi.org/10.4081/aiol.2024.11301
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