I have a strong interest in the seasonal cycle of (sub)mesoscale turbulence in the surface ocean and how it interacts with the large-scale ocean circulation and biogeochemistry. I approach the problems by analyzing big data outputs from general circulation models, idealized numerical simulations and remote-sensed observations.
Ph.D. - Physical Oceanography
Columbia University in the City of New York, USA
Summer School - Turbulence Theory in Climate Dynamics
École de Physique des Houches, France
B.E. - Ocean Engineering
The University of Tokyo, Japan
Uchida, T., J. Le Sommer, C. Stern, R. Abernathey, C. Holdgraf, A. Albert, L. Brodeau, E. Chassignet, X. Xu, J. Gula, G. Roullet, N. Koldunov, S. Danilov, Q. Wang, D. Menemenlis, C. Bricaud, B. Arbic, J. Shriver, F. Qiao, B. Xiao, A. Biastoch, R. Schubert, B. Fox-Kemper & W. Dewar. Cloud-based framework for inter-comparing submesoscale permitting realistic ocean models. Geosci. Mod. Dev.
Balwada, D., S. Smith, T. Uchida & R. Abernathey. Eddy transport tensor in a zonally inhomogeneous ocean channel.
Uchida, T., B. Deremble & W. Dewar. A stochastic model for eddy dynamics in a quasi-geostrophic double gyre.
Uchida, T., E. Johnson, J. Le Sommer & B. Deremble. Constraining the local relation between eddy tracer fluxes and mean tracer gradients with deep learning in a double-gyre ensemble.
Uchida, T., Q. Jamet, W. Dewar, D. Balwada, J. Le Sommer & T. Penduff. Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble, Part II: Anisotropic eddy diffusivity.
Uchida, T., Q. Jamet, W. Dewar, J. Le Sommer & T. Penduff. Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble, Part III: On mode waters.
Balwada, D., W. Chen, J. C. Ohlmann, T. Uchida & R. Abernathey. Velocity Structure Functions in California’s Coastal Seas from Surface Drifters.
Uchida, T., Q. Jamet, W. Dewar, J. Le Sommer, T. Penduff & D. Balwada. Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble, Part I: The Eliassen-Palm flux. J. Adv. Mod. Earth Sys. 2022.
Khatri, H., S. Griffies, T. Uchida, H. Wang & D. Menemenlis. Role of mixed-layer instabilities in the seasonal evolution of eddy kinetic energy spectra in a global submesoscale permitting simulation. Geophys. Res. Let. 2021.
Uchida.T, J. Le Sommer, A. Albert, C. Holdgraf, R. Abernathey, C. Stern, E. Chassignet, X. Xu, J. Gula, G. Roullet, Q. Wang, N. Koldunov, S. Danilov, D. Menemenlis, C. Bricaud, A. Biastoch, R. Schubert & B. Fox-Kemper. Inter-comparison of basin-scale submesoscale permitting ocean models at SWOT Crossover regions. Future Directions in Basin and Global High-resolution Ocean Modelling. Oct. 2021. Kiel, Germany.
Uchida, T., D. Balwada, R. Abernathey, G. McKinley, S. Smith & M. Lévy. A Mechanistic Understanding on Eddy Iron Transport in the Southern Ocean. AMS 22nd Conference on Atmospheric and Oceanic Fluid Dynamics. Jun. 2020. Portland, Maine, USA.
Uchida, T., R. Abernathey, G. McKinley, S. Smith, D. Balwada & M. Lévy. Seasonality of eddy iron fluxes in the Southern Ocean and its impact on primary production. NHOM-Brest: Workshop on Non-Hydrostatic Ocean Modeling. Oct. 2018. Brest, France.
Uchida, T., R. Abernathey & S. Smith. The global seasonal cycle of mixed layer instability in a GCM. AMS 21st Conference on Atmospheric and Oceanic Fluid Dynamics & 19th Conference on Middle Atmosphere. Jun. 2017. Portland, USA.
Consistent OceaN Turbulence for ClimaTe Simulators
CONTaCTS is a project aiming to study and parameterize (sub)mesoscale momentum fluxes where it is critical: within the surface and bottom boundary layers of the ocean, where it interacts with the atmosphere and topography. We propose to develop such parameterizations for O(10km) resolution models, based on the analysis of existing O(1km) resolution North Atlantic simulations (eNATL60).
Bioproductivity in the open Southern Ocean
I am interested in the impact of eddy fluxes on the transport of momentum and tracers such as carbon and nutrients, and how this affect the bioproductivity in the Southern Ocean. The Southern Ocean is know as one of the high-nutrient low-chlorophyll zones, with the limiting nutrient being iron. This makes the biological pump of carbon in the region very sensitive to influx of iron, yet our insights into the pathways of iron are limited. My interest has been to quantify the relative impact of supply by the ocean dynamics. Below is a list of packages I have developed and/or contributed to for my analysis.
xrft is a Python package for taking the discrete Fourier transform (DFT) on xarray and dask arrays. It keeps the metadata of the original dataset and provides a clean work flow of DFT.
xomega is a Python package for inverting the generalized Omega equation given the right-hand side of the equation. It solves the inversion in Fourier space and provides an efficient work flow.
oceanmodes is a Python package for linear quasigeostrophic normal mode analysis given the background state of velocity and density profile.