Quantifying Eulerian Eddy Leakiness in An Idealized Model

This is a Preprint and has not been peer reviewed. This is version 3 of this Preprint.


Download Preprint


Tongya Liu, Ryan Abernathey , Anirban Sinha, Dake Chen


An idealized eddy-resolving ocean basin, closely resembling the North Pacific ocean, is simulated using MITgcm. We identify rotationally coherent Lagrangian vortices (RCLVs) and sea surface height (SSH) eddies based on the Lagrangian and Eulerian framework, respectively. General statistical results show that RCLVs have a much smaller coherent core than SSH eddies with the ratio of radius is about 0.5. RCLVs are often enclosed by SSHA contours, but SSH eddy identification method fails to detect more than half of RCLVs. Based on their locations, two types of eddies are classified into three categories: overlapping RCLVs and SSH eddies, non-overlapping SSH eddies, and non-overlapping RCLVs. Using Lagrangian particles, we examine the processes of leakage and intrusion around SSH eddies. For overlapping SSH eddies, over the lifetime, the material coherent core only accounts for about 25%, and about 50% of initial water leak from eddy interior. The remaining 25% of water can still remain inside the boundary, but only in the form of filaments outside the coherent core. For non-overlapping SSH eddies, more water leakage (about 60\%) occurs at a faster rate. Following the number and radius of real SSH eddies, fixed circles and moving circles are randomly selected to diagnose the material flux around these circles. We find that the leakage and intrusion trends of moving circles are quite similar to that of non-overlapping SSH eddies, suggesting that the material coherence properties of non-overlapping SSH eddies are not significantly different from random pieces of ocean with the same size.




Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics


Coherent transport, Eddy leakiness, Eulerian eddies, Lagrangian eddies


Published: 2019-08-21 02:46

Last Updated: 2019-10-22 07:28

Older Versions

GNU Lesser General Public License (LGPL) 2.1

Add a Comment

You must log in to post a comment.


There are no comments or no comments have been made public for this article.