[Eoas-seminar] COAPS Short Seminar Series

Wed Sep 4 15:15:05 EDT 2024

COAPS Short Seminar Series
11:00 AM September 9th
Attend F2F (in 255 Research A) or Virtually (via Zoom)
https://fsu.zoom.us/j/92268262553

Meeting ID: 922 6826 2553
Talks are normally 12 minutes long with an additional 8 minutes for questions. Our second talk is allocated 30 minutes, with 10 minutes for questions.

SFMR Performance during the 2024 Hurricane Season
By Heather Holbach
Description: This presentation will focus on assessing the calibration quality of the various SFMR units that have collected data during the 2024 hurricane season by comparing the observed brightness temperatures with modeled brightness temperatures. Initial results indicate that the calibration quality of several fo the SFMR units are questionable and may need to be corrected prior to collecting additional data this hurricane season.

Mesoscale Eddy Effects on Oceanic Tracers: Frontogenesis and Mixing
By Yueyang Lu
Description: Mesoscale eddies with lateral length scales of O(10–100) km are ubiquitous in the ocean. They profoundly affect the distribution of tracers such as carbon and nutrients. The eddies can generate tracer fronts and enhance mixing. Their effects have been traditionally described by eddy-induced advection and diffusion. In this talk, I will first discuss the role of eddies in generating the large-scale oceanic front associated with the Gulf Stream. Our analysis reveals that the eddies act to sharpen the front whereas the large-scale current weakens it. This eddy-induced frontogenesis is captured by a novel generalized eddy-induced advection, which effectively reproduces the front in an idealized coarse-resolution model. In the second part, I will discuss a commonly overlooked discrepancy between Lagrangian and Eulerian eddy diffusivities. The Lagrangian eddy diffusivity, derived from dispersion of drifters or particles, is inherently nonlocal in both space and time, describing only down-gradient diffusive behavior. In contrast, the Eulerian eddy diffusivity, derived from tracer concentrations and eddy fluxes, is local. I will show that the two differ significantly in both along- and cross-stream directions. The discrepancy arises from the nonlocal nature of the Lagrangian diagnostic and the anisotropy of eddy-induced mixing. To address this, I propose a novel approach to calculating the Eulerian diffusivity from Lagrangian particles. This talk aims to highlight the advantages of an advective framework for representing eddy effects in ocean climate models, and to refine our understanding of eddy mixing rates derived from Lagrangian data.

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