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The impact of high-frequency current variability on dispersion off the eastern Antarctic Peninsula

Trasviña, A.; Heywood, Karen J.; Renner, A.H.H.; Thorpe, S.E.; Thompson, A.F.; Zamudio, L.. 2011 The impact of high-frequency current variability on dispersion off the eastern Antarctic Peninsula. Journal of Geophysical Research, 116 (C11), C11024. 13, pp. 10.1029/2011JC007003

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Abstract/Summary

We present observations of high-frequency current variability on the continental shelf and the slope of the Antarctic Peninsula using Lagrangian surface drifters deployed as part of the Antarctic Drifter Experiment: Links to Isobaths and Ecosystems (ADELIE) project. Here we focus on high-frequency processes such as tides and inertial oscillations that are typically smoothed out of large-scale spatially averaged, and/or temporally averaged, observed current fields. We investigate the role that this class of motion plays in the transport of physical or biogeochemical properties. Lateral displacements on the shelf and slope are found to be larger than displacements in deeper waters where tidal currents are negligible. We apply this result in a parameterization of the lateral dispersion during an off-line drifter modeling study. The outcome is an improvement on the modeling of Lagrangian drifting particles compared with a standard random walk scheme.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2011JC007003
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
BAS Programmes > Antarctic Funding Initiative Projects
ISSN: 0148-0227
NORA Subject Terms: Marine Sciences
Date made live: 10 Jan 2012 09:17
URI: http://nora.nerc.ac.uk/id/eprint/16317

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