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This study presents several new observations from the study of a warm-corering (WCR) in the Gulf of Mexico based on the ECCO2 global ocean simulation.Using Lagrangian coherent structures (LCS) techniques to investigate this flowreveals a pattern of transversely intersecting LCS in the mixed layer of theWCR which experiences consistent stretching behavior over a large region ofspace and time. A detailed analysis of this flow region leads to an analyticalmodel velocity field which captures the essential elements that generate thetransversely intersecting LCS. The model parameters are determined from the WCRand the resulting LCS show excellent agreement with those observed in the WCR.The three-dimensional transport behavior which creates these structures relieson the small radial outflow which is present in the mixed layer and is not seenbelow the pycnocline, leading to a sharp change in the character of the LCS atthe bottom of the mixed layer. The flow behavior revealed by the LCS limitsfluid exchange between the WCR and the surrounding ocean, contributing to thelong life of WCRs. Further study of these structures and their associatedtransport behavior may lead to further insights into the development andpersistence of such geophysical vortices as well as their transport behavior.

Observations on the flow structures and transport in a warm-core ring in the Gulf of Mexico