EGU21-6537, updated on 05 May 2021
https://doi.org/10.5194/egusphere-egu21-6537
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Multiplatform observation of cyclonic eddies during the REEBUS experiment

Tim Fischer1, Johannes Karstensen1, Marcus Dengler1, and Arne Bendinger1,2
Tim Fischer et al.
  • 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Physical Oceanography, Kiel, Germany (tfischer@geomar.de)
  • 2LEGOS (Laboratoire d’Etudes en Géophysique et Océanographie Spatiales), Université de Toulouse, IRD, CNES, CNRS, UPS, Toulouse, France

During the collaborative project "Role of Eddies in the Carbon Pump of Eastern Boundary 

Upwelling Systems" (REEBUS), that took place in the eastern tropical North Atlantic in 2019, 

three cyclonic mesoscale eddies were intensely surveyed by ship and autonomous systems. The 

three eddies were located at different distances to the coast, the most intense of them 

(vorticity about 0.5 times f) was found in lee of the Cabo Verdian island of Fogo. Here we 

present the reconstruction of the 3-D structure for the three eddies from ship ADCP and 

hydrographic sections. Divergence estimates suggest the existence of a downwelling cell in the 

center of all three eddies. This cell extends from below the thermocline down to some hundred 

meters, at a diameter of about 10 nautical miles. Surface signatures of the eddies indicate 

elliptic and oscillating behavior which is further investigated using the interior ocean data. 

In this work we also explore the limitations of section-based ocean mesoscale eddy 

reconstructions.

How to cite: Fischer, T., Karstensen, J., Dengler, M., and Bendinger, A.: Multiplatform observation of cyclonic eddies during the REEBUS experiment, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-6537, https://doi.org/10.5194/egusphere-egu21-6537, 2021.

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