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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 2
Nonlin. Processes Geophys., 24, 189–202, 2017
https://doi.org/10.5194/npg-24-189-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Current perspectives in modelling, monitoring, and predicting...

Nonlin. Processes Geophys., 24, 189–202, 2017
https://doi.org/10.5194/npg-24-189-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 03 May 2017

Research article | 03 May 2017

Trajectory encounter volume as a diagnostic of mixing potential in fluid flows

Irina I. Rypina and Lawrence J. Pratt
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Cited articles  
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AVISO: Ssalto/Duacs delayed-time global gridded maps of absolute geostrophic velocities (1∕4°  ×  1∕4° on a Cartesian grid), available at: http://www.aviso.altimetry.fr/en/data/products/sea-surface-height-products/global.html, last access: 24 April 2017.
Bejan, A.: Convection Heat Transfer, Wiley, New York, USA, 1995.
Beron-Vera, F. J., Wang, Y., Olascoaga, M. J., Goni, J. G., and Haller, G.: Objective detection of oceanic eddies and the Agulhas leakage, J. Phys. Oceanogr., 43, 1426–1438, 2013.
Budisic, M. and Mezic, I.: Geometry of the ergodic quotient reveals coherent structures in flows, Physica D, 241, 1255–1269, 2012.
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Short summary
Fluid parcels exchange water properties when coming into contact with each other, leading to mixing. The trajectory encounter volume, defined here as the volume of fluid that passes close to a reference trajectory over a finite time interval, is introduced as a measure of the mixing potential of a flow. Regions with a low encounter volume (the cores of coherent eddies) have a low mixing potential. Regions with a large encounter volume (turbulent or chaotic regions) have a high mixing potential.
Fluid parcels exchange water properties when coming into contact with each other, leading to...
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