Rectification effects of regional air–sea interactions over western boundary current on large-scale sea surface temperature and extra-tropical storm tracks
The warm Western Boundary Currents (WBCs) and their zonal extensions are persistent, deep, strong and narrow oceanic currents. They are known to anchor and energize the Extra-Tropical storm tracks by frontal thermal air-sea interactions. However, even in the latest generation of climate models, WBCs are characterized by large biases, and both the present storm-track activity and its recent intensification are poorly estimated. Mesoscale air-sea interactions, and in particular the Current Feedback to the Atmosphere (CFB) have been shown to be important in ocean and in particular WBC dynamics as they modify the energy budget of the ocean. CFB causes eddy-killing by drag friction between currents and the atmosphere. It damps the oceanic eddy activity, and, thus, weakens the eddy-mean flow interaction, stabilizing WBCs. Based on cutting-edge high-resolution coupled global simulations, we show that the stabilization of WBCs by CFB modulates the mean Sea Surface Temperature and its meridional gradients as well and the turbulent heat fluxes between the ocean and the atmosphere. This alters the baroclinicity of the lower atmosphere, which in turn modulates the extra tropical storm-tracks intensity by up to 15%.
Authors
- Thomas Arsouze (ORCID: https://orcid.org/0000-0002-8871-6120)
- Fabien Desbiolles (ORCID: https://orcid.org/0000-0002-8047-602X)
- Justin Small (ORCID: https://orcid.org/0000-0002-3452-2179)
- Lionel Renault (ORCID: https://orcid.org/0000-0002-3001-2091)
Institutions
- NSF National Center for Atmospheric Research (US)
- Centre National de la Recherche Scientifique (FR)
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (FR)
- Université Toulouse III - Paul Sabatier (FR)
- University of California, Los Angeles (US)
- Université Fédérale de Toulouse Midi-Pyrénées (FR)
- Université de Montpellier (FR)
- Institut Agro Montpellier (FR)
- Centre National d'Études Spatiales (FR)
- Barcelona Supercomputing Center (ES)
- Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
- CIMA Research Foundation (IT)
- Laboratoire d’Études en Géophysique et Océanographie Spatiales (FR)
- Université Bourgogne Franche-Comté (FR)
- UMR Botanique et Modélisation de l’Architecture des Plantes et des végétations (FR)
- NSF NCAR Climate and Global Dynamics Laboratory (US)
- Institut de Recherche pour le Développement (FR)
- University of Milano-Bicocca (IT)
- Universitat Politècnica de Catalunya (ES)
Publication Details
- Journal
- Scientific Reports
- Published
- 2024-12-30
- DOI
- https://doi.org/10.1038/s41598-024-82667-2
- Citations
- 1
- Primary Topic
- Tropical and Extratropical Cyclones Research
- Type
- article
- Field-Weighted Citation Impact
- 0.38
Funders
- Centre National de la Recherche Scientifique