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Márquez-Artavia, A., X., Márquez-Artavia, J.P., Salazar-Ceciliano, L., Sánchez-Velasco, E., Beier & A., Paulmier (2024). Rossby waves impact on persistent oxic and suboxic chlorophyll maxima in the Eastern Tropical North Pacific. Advances in Oceanography and Limnology. 15(1): 11301. DOI: 10.4081/aiol.2024.11301.

Rossby waves impact on persistent oxic and suboxic chlorophyll maxima in the Eastern Tropical North Pacific

Amaru Márquez-Artavia 1, Xiomara Márquez-Artavia 2, Juan Pablo Salazar-Ceciliano 2, Laura Sánchez-Velasco 3, Emilio Beier 4 y Aurelien Paulmier 5

1 CONACyT-Ensenada Center for Scientific Research and Higher Education, Department of Physics, National University of Costa Rica, Department of Plankton and Marine Ecology, National Polytechnic Institute - Interdisciplinary Center in Marine Sciences
2 Department of Physics, National University of Costa Rica, Heredia, Costa Rica
3 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Department of Plankton and Marine Ecology, National Polytechnic Institute - Interdisciplinary Center in Marine Sciences, La Paz
4 Laboratory of Marine Macroecology CONACyT, Ensenada Center for Scientific Research and Higher Education, Ensenada
5 Laboratory of Space Geophysical and Oceanographic Studies, CNRS/IRD/UPS/CNES, Toulouse, France
This study aims to describe the response of two persistent chlorophyll-a maxima to physical processes that affect the position 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 nutrients) 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 decorrelated responses of the chlorophyll-a maxima could be explained 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 enhancements in chlorophyll-a concentration in one maximum.

Palabras clave: BGC-Argo float; chlorophyll-a maxima; isopycnal movement; Oxygen Minimum Zones; Rossby waves

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