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About me

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Publications

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Research interests

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About me

A physical oceanographer with a flair of GFD and data science. I have a strong interest in (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.

Positions held

Assistant research scientist
Center for Ocean-Atmospheric Prediction Studies (COAPS), USA
2022-present

MOPGA postdoctoral research fellow
Centre Nationale de la Recherche Scientifique (CNRS), France
2019-2022

Education

Ph.D. - Physical Oceanography
Columbia University in the City of New York, USA
2014-2019

Summer School - Turbulence Theory in Climate Dynamics
École de Physique des Houches, France
August 2017

B.E. - Ocean Engineering
The University of Tokyo, Japan
2010-2014

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Publications

Submitted

Uchida, T., D. Balwada, Q. Jamet, W. Dewar, T. Penduff & J. Le Sommer. Cautionary tales from the mesoscale eddy diffusivity tensor. Ocean Model.

Uchida, T., Q. Jamet, A. Poje, N. Wienders, B. Deremble & W. Dewar. Wavelet-based wavenumber spectral estimate of eddy kinetic energy: Theory. J. Adv. Mod. Earth Sys.

Ajayi, A., J. Le Sommer, L. Brodeau, B. Arbic, A. Albert, T. Uchida & P. Klein. On the modulation of kinetic energy transfer by internal gravity waves. Geophys. Res. Let.

In preparation

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, 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.

Published

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. 2022.

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.

Uchida, T., B. Deremble & S. Popinet. Deterministic model of the eddy dynamics for a midlatitude ocean model. J. Phys. Ocean. 2022.

Uchida, T., Q. Jamet, A. Poje & W. Dewar. An ensemble-based eddy and spectral analysis, with application to the Gulf Stream. J. Adv. Mod. Earth Sys. 2021.

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., B. Deremble, W. Dewar & T. Penduff. Diagnosing the Eliassen-Palm flux from a quasi-geostrophic double gyre ensemble. In proceedings of the EarthCube Annual Meeting. 2021.

Uchida, T., B. Deremble & T. Penduff. The seasonal variability of the ocean energy cycle from a quasi-geostrophic double gyre ensemble. Fluids. 2021.

Jamet, Q., B. Deremble, N. Wienders, T. Uchida & W. Dewar. On wind-driven energetics of subtropical gyres. J. Adv. Mod. Earth Sys. 2021.

Jones, S., J. Busecke, T. Uchida & R. Abernathey. Vertical regridding and remapping of CMIP6 ocean data in the cloud. In proceedings of the EarthCube Annual Meeting. 2020.

Uchida, T., D. Balwada, R. Abernathey, G. McKinley, S. Smith & M. Lévy. Vertical iron fluxes support primary production in the open Southern Ocean. Nature Comm. 2020.

Uchida, T., D. Balwada, R. Abernathey, G. McKinley, S. Smith & M. Lévy. The contribution of submesoscale over mesoscale eddy iron transport in the open Southern Ocean. J. Adv. Mod. Earth Sys. 2019.

Uchida, T., D. Balwada, R. Abernathey, P. Channing, E. Boss & S. Gille. Southern Ocean Phytoplankton Blooms Observed by Biogeochemical Floats. JGR: Oceans. 2019.

Uchida, T., R. Abernathey & S. Smith. Seasonality of eddy kinetic energy in an eddy permitting global climate model. Ocean Model. 2017.

Non-refereed

Uchida, T. Seasonality in surface (sub)mesoscale turbulence and its impact on iron transport and primary production. Ph.D. Thesis, 2019.

Uchida, T. Analysis of Island-trapped Waves off the Izu-Islands. B.E. Thesis, 2014.

Selected oral & poster presentations

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, Q. Jamet, W. Dewar, D. Balwada, J. Le Sommer & T. Penduff. Towards a potential vorticity based mesoscale closure scheme. CESM Ocean Model Working Group Meeting. Feb. 2021.

Jamet, Q., T. Uchida, & W. Dewar. Diagnosing eddy-to-small scale transfers in eNATL60. DRAKKAR 2020 Annual Workshop. Feb. 2020. Grenoble, France.

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 in eddy iron fluxes and its impact on primary production. AGU Fall Meeting. Dec. 2018. Washington D.C., 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 & D. Balwada. Idealized Study of Seasonal Dynamics in the Southern Ocean. Gordon Research Conference. Jun. 2018. Andover, USA.

Khatri H., T. Uchida & D. Balwada. Ocean Surface Spectral Fluxes of Kinetic Energy, Enstrophy and Buoyancy Variance from a Earth System Model. Gordon Research Conference. Jun. 2018. Andover, USA.

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.

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Big-data Oceanography

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
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
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
oceanmodes is a Python package for linear quasigeostrophic normal mode analysis given the background state of velocity and density profile.

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