Ring Dynamics in the Western Gulf of Mexico

<p>The interaction of a recently-formed Loop Current ring and a fossil ring is studied using observations and a two-layered eddy-resolving general circulation model of the Gulf of Mexico. This interaction is investigated by following the evolution of volume, energy, potential vorticity, angular momentum and enstrophy within a model ring as it moves westward and encounters a fossil ring along the continental slope of the Gulf of Mexico. By comparing the model results with drifter and hydrographic data several new insights into ring/ring and ring/slope interactions are seen. A Loop Current ring may merge with a fossil ring along the slope. The signature of this merger is evident in many drifter tracks suggesting that this occurs in the Gulf quite frequently. This merger explains several observations. There is an offshore transport induced by the merging of the rings that is comparable to the transport out of the Florida Straits. The volume of the Loop Current ring decreases sharply during the merger indicating an exchange of mass is occurring. A cyclone is generated when the ring interacts with a fossil ring and there is a transfer of energy from the surface layer to the lower layer.</p> <p>Analysis also shows that during the merger, as expected, a decrease in energy, potential vorticity and angular momentum and an increase in enstrophy occur. Other cyclones are seen first in the lower layer, prior to the ring's arrival in the slope area, and then appear in the upper layer as the ring interacts with another ring and/or the slope.</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Ocean & Earth Sciences

Year dc:date.available

1992

Author dc:creator

• Indest, Adolphe W.

Contributors dc:contributor

• A. D. Kirwan, jr.
• Chester E. Grosch
• Gabe Csanady
• Dana Thompson

• Loop current
• Ring dynamics
• Circulation
• Gulf of Mexico
• Oceanography

Statement dc:rights

• <p>In Copyright. URI: <a href="http://rightsstatements.org/vocab/InC/1.0/">http://rightsstatements.org/vocab/InC/1.0/</a> This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</p>

Repository record dc:identifier

https://digitalcommons.odu.edu/oeas_etds/133

OAI identifier oai:identifier

oai:digitalcommons.odu.edu:oeas_etds-1130