EGU21-1253, updated on 20 Apr 2022
https://doi.org/10.5194/egusphere-egu21-1253
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impact of mesoscale eddies on salinity and CO2 ocean parameters in the western tropical Atlantic in February 2020

Léa Olivier1, Jacqueline Boutin1, Nathalie Lefèvre1, Gilles Reverdin1, Peter Landschützer2, Sabrina Speich3, and Johannes Karstensen4
Léa Olivier et al.
  • 1LOCEAN-IPSL, Sorbonne Université-CNRS-IRD-MNHN, Paris, France
  • 2Max Planck Institute for Meteorology, Hamburg, Germany
  • 3Laboratoire de Météorologie Dynamique, ENS-Ecole Polytechnique-CNRS-Sorbonne Université, Paris, France.
  • 4GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany

Large oceanic eddies are formed by the retroflection of the North Brazil Current (NBC) near 8°N in the western tropical Atlantic. The EUREC4A-OA/Atomic cruise took place in January - February 2020, and extensively documented two NBC rings. The NBC flows northward across the Equator and pass the mouth of the Amazon River, entraining fresh and nutrient-rich water along its nearshore edge. From December to March, the Amazon river discharge is low but a freshwater filament stirred by a NBC ring was nevertheless observed. The strong salinity gradient can be used to delineate the NBC ring during its initial phase and its westward propagation. Using satellite sea surface salinity and ocean color associated to in-situ measurements of salinity, temperature, dissolved inorganic carbon, alkalinity and fugacity of CO2 we characterize the salinity and biogeochemical signature of NBC rings.

How to cite: Olivier, L., Boutin, J., Lefèvre, N., Reverdin, G., Landschützer, P., Speich, S., and Karstensen, J.: Impact of mesoscale eddies on salinity and CO2 ocean parameters in the western tropical Atlantic in February 2020, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1253, https://doi.org/10.5194/egusphere-egu21-1253, 2021.

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