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Nobuhiro Suzuki

Air-sea-wave coupling at submeso and smaller scales

PostDoctoral Fellow: Dr. Nobuhiro Suzuki
Scientific Sponsors: Dr. Jean-Luc Redelsperger, Dr. Fabrice Ardhuin, Dr. Bertrand Chapron  (Laboratoire d'Océanographie Physique et Spatiale (LOPS)).
LabexMER Research Axis 7: Sea motions and interactions with marine structures

Mixing, stratification, air-sea fluxes, thermocline entrainment, global energy cycle, transport of heat and biogeochemical materials etc. are affected by submesoscale fronts and small scale turbulence. In turn, these flows of O(1 cm - 10 km) are strongly modified by ocean surface waves. Interactions between these phenomena started being discovered only recently, and there should be many more to be discovered. However, the interactions often involve flows and processes having different time and spatial scales. This poses theoretical, observational, and numerical challenges. Moreover, many of the interactions originate fundamentally from a coupling between atmosphere, ocean, and surface waves, which are typically studied separately. Therefore, in order to accomplish discoveries of the interaction phenomena, we will couple high-resolution Large Eddy Simulation (LES) of atmosphere and ocean. In addition, a wave model will be coupled with the new LES. The LES will enable us to study the interaction phenomena at O(1 cm - 10 km) and provide new information necessary to advance other marine sciences such as satellite imaging technology and marine ecology.


 Figure 1 : Small-scale turbulence interacting with an oceanic submesoscale front. The color shows the buoyancy (blue: dense, orange: light) simulated using LES (Hamlington et al. 2014; Suzuki et al. 2016)




Figure 2 : Sea surface roughness modified by submesoscale fronts revealed by Sentinel 1 synthetic aperture radar (SAR). The area shown is about 25 km x 25 km. Retrieved from MPC Sentinel-1 portal



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