A Lagrangian Method for Extracting Eddy Boundaries in the Red Sea and the Gulf of Aden

Anke Friederici, Habib Toye Mahamadou Kele, Ibrahim Hoteit, Tino Weinkauf, Holger Theisel and Markus Hadwiger

IEEE Scientific Visualization 2018 Short Papers, pp. 52-56 , 2018

Mesoscale ocean eddies play a major role for both the intermixing of water and the transport of biological mass. This makes the identification and tracking of their shape, location and deformation over time highly important for a number of applications. While eddies maintain a roughly circular shape in the free ocean, the narrow basins of the Red Sea and Gulf of Aden lead to the formation of irregular eddy shapes that existing methods struggle to identify. We propose the following model: Inside an eddy, particles rotate around a common core and thereby remain at a constant distance under a certain parametrization. The transition to the more unpredictable flow on the outside can thus be identified as the eddy boundary. We apply this algorithm on a realistic simulation of the Red Sea circulation, where we are able to identify the shape of irregular eddies robustly and more coherently than previous methods. We visualize the eddies as tubes in space-time to enable the analysis of their movement and deformation over several weeks.

@inproceedings{Friederici2018RedSeaEddies,
  title = {A Lagrangian Method for Extracting Eddy Boundaries in the Red Sea and the Gulf of Aden},
  author = {Friedrici, Anke and Toye Mahamadou Kele, Habib and Hoteit, Ibrahim and Weinkauf, Tino and Theisel, Holger and Hadwiger, Markus},
  booktitle = {IEEE Scientific Visualization 2018 Short Papers},
  year = {2018},
  pages = {52--56}
}