[Eoas-seminar] COAPS Short Seminar Series

[eoas-seminar at lists.fsu.edu]

COAPS Short Seminar Series
11:00 AM Oct. 6th
Attend F2F (in 255 Research A) or Virtually (via Zoom)
https://fsu.zoom.us/j/92268262553

Meeting ID: 922 6826 2553
Talks are 12 minutes long with an additional 8 minutes for questions.

>From Lagrangian Trajectories to Eulerian Fields: Applications to Mesoscale Eddy Diffusivity and Beyond
By Yueyang Lu
Description: Lagrangian observations from floats and drifters are important for studying ocean circulation and dynamics. They capture ocean motions across a wide range of spatial and temporal following the trajectories. However, the statistics derived from these observations are fundamentally nonlocal, as they involve averaging along trajectories. In contrast, much of our understanding of the ocean is formulated in a Eulerian (local) framework, where properties are defined at fixed locations—consistent with how ocean models represent processes. An example is mesoscale eddy diffusivity, which quantifies the strength of eddy-driven mixing and is defined locally due to the spatial inhomogeneity of eddies. Traditional estimates using Lagrangian trajectories rely on long-time averages, yielding asymptotic eddy diffusivity that obscure the spatiotemporal variability. This highlights the need for methods that connect nonlocal Lagrangian measurements with local Eulerian statistics. In this talk, I will present a “hybrid” approach for inferring Eulerian fields directly from Lagrangian trajectories. The central idea is that continuous evolution of fluids can be reconstructed from motions of a finite set of fluid parcels. Using an idealized eddy-resolving model, we reconstructed Eulerian fields—including tracer concentration, eddy tracer fluxes, and eddy diffusivity from Lagrangian particles alone. The fields closely match their purely Eulerian counterparts. Finally, I will discuss potential extensions of this idea to broader oceanographic contexts. The goal is to explore new ways of using Lagrangian measurements to advance our understanding of ocean processes and generate projects to collaborate with COAPS colleagues.

Enthalpy Fluxes in Tropical Cyclones
By Amelia Bryan
Description: Dropsonde data are used to determine enthalpy fluxes in tropical cyclones.

NOTE: Please feel free to forward/share this invitation with other groups/disciplines that might be interested in this talk/topic. All are welcome to attend.


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