EGU2020-13372
https://doi.org/10.5194/egusphere-egu2020-13372
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

The Current Feedback to the Atmosphere: Implications for the Ocean Dynamics, Air-Sea Interactions, and Climate.

Lionel Renault1, Sebastien Masson2, and James C. McWilliams3
Lionel Renault et al.
  • 1France (lionel.renault@ird.fr)
  • 2France
  • 3UCLA

In the past few years, it has been demonstrated that the regional Ocean-Atmosphere interactions can strongly modulate the variability and the mean physical and biogeochemical state of the ocean. In this presentation, the focus will be on the influence of the surface current on the atmosphere (i.e., current feedback). Based on satellite observations and using a set of regional ocean and atmosphere coupled simulations carried out over different regions encompassing a realistic Tropical Channel, and Eastern and Western boundary current systems, we will illustrate to which extent those interactions can control the exchange of energy between the Ocean and the Atmosphere, the mean, mesoscale, and submesoscale circulations, and the Western Boundary Currents Dynamics. Implications for climate, thermal air-sea interactions and how to force an oceanic model is furthermore discussed.

How to cite: Renault, L., Masson, S., and McWilliams, J. C.: The Current Feedback to the Atmosphere: Implications for the Ocean Dynamics, Air-Sea Interactions, and Climate., EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-13372, https://doi.org/10.5194/egusphere-egu2020-13372, 2020

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Display material version 1 – uploaded on 30 Apr 2020
  • CC1: Comment on EGU2020-13372, Charles Pelletier, 03 May 2020

    Hi Lionel, thank you for the interesting display! I have 2 questions.

    1) Why is the coupling coefficient not shown around the Equator (or is it zero)?
    2) Have you been able to observe how this feedback parameterization behaves in extreme cases where surface currents and near-surface winds are of the same order of magnitude, or even when winds are slower than currents? If so, what comes out of it?

    • AC1: Reply to CC1, Lionel Renault, 04 May 2020

      Hi Lionel, thank you for the interesting display! I have 2 questions.

      Hi,thanks for your questions

      1) Why is the coupling coefficient not shown around the Equator (or is it zero)?

      We aim to estimate the coupling coefficient at the mesoscale.  Mesoscale currents are very nearly geostrophic and the geostrophic approximation is no longer valid around the Equator. The use of geostrophic currents also allows us to isolate the mesoscale from ageostrophic wind-driven currents.

      2) Have you been able to observe how this feedback parameterization behaves in extreme cases where surface currents and near-surface winds are of the same order of magnitude, or even when winds are slower than currents? If so, what comes out of it?

      that's an interesting question that we are currently assesing !

      cheers

      Lionel