Eddy-Induced Particle Dispersion in the Near-Surface North AtlanticSource: Journal of Physical Oceanography:;2012:;Volume( 042 ):;issue: 012::page 2206DOI: 10.1175/JPO-D-11-0191.1Publisher: American Meteorological Society
Abstract: his study investigates the anisotropic properties of the eddy-induced material transport in the near-surface North Atlantic from two independent datasets, one simulated from the sea surface height altimetry and one derived from real-ocean surface drifters, and systematically examines the interactions between the mean- and eddy-induced material transport in the region. The Lagrangian particle dispersion, which is widely used to characterize the eddy-induced tracer fluxes, is quantified by constructing the ?spreading ellipses.? The analysis consistently demonstrates that this dispersion is spatially inhomogeneous and strongly anisotropic. The spreading is larger and more anisotropic in the subtropical than in the subpolar gyre, and the largest ellipses occur in the Gulf Stream vicinity. Even at times longer than half a year, the spreading exhibits significant nondiffusive behavior in some parts of the domain. The eddies in this study are defined as deviations from the long-term time-mean. The contributions from the climatological annual cycle, interannual, and subannual (shorter than one year) variability are investigated, and the latter is shown to have the strongest effect on the anisotropy of particle spreading. The influence of the mean advection on the eddy-induced particle spreading is investigated using the ?eddy-following-full-trajectories? technique and is found to be significant. The role of the Ekman advection is, however, secondary. The pronounced anisotropy of particle dispersion is expected to have important implications for distributing oceanic tracers, and for parameterizing eddy-induced tracer transfer in non-eddy-resolving models.
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contributor author | Rypina, Irina I. | |
contributor author | Kamenkovich, Igor | |
contributor author | Berloff, Pavel | |
contributor author | Pratt, Lawrence J. | |
date accessioned | 2017-06-09T17:19:08Z | |
date available | 2017-06-09T17:19:08Z | |
date copyright | 2012/12/01 | |
date issued | 2012 | |
identifier issn | 0022-3670 | |
identifier other | ams-83094.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4226281 | |
description abstract | his study investigates the anisotropic properties of the eddy-induced material transport in the near-surface North Atlantic from two independent datasets, one simulated from the sea surface height altimetry and one derived from real-ocean surface drifters, and systematically examines the interactions between the mean- and eddy-induced material transport in the region. The Lagrangian particle dispersion, which is widely used to characterize the eddy-induced tracer fluxes, is quantified by constructing the ?spreading ellipses.? The analysis consistently demonstrates that this dispersion is spatially inhomogeneous and strongly anisotropic. The spreading is larger and more anisotropic in the subtropical than in the subpolar gyre, and the largest ellipses occur in the Gulf Stream vicinity. Even at times longer than half a year, the spreading exhibits significant nondiffusive behavior in some parts of the domain. The eddies in this study are defined as deviations from the long-term time-mean. The contributions from the climatological annual cycle, interannual, and subannual (shorter than one year) variability are investigated, and the latter is shown to have the strongest effect on the anisotropy of particle spreading. The influence of the mean advection on the eddy-induced particle spreading is investigated using the ?eddy-following-full-trajectories? technique and is found to be significant. The role of the Ekman advection is, however, secondary. The pronounced anisotropy of particle dispersion is expected to have important implications for distributing oceanic tracers, and for parameterizing eddy-induced tracer transfer in non-eddy-resolving models. | |
publisher | American Meteorological Society | |
title | Eddy-Induced Particle Dispersion in the Near-Surface North Atlantic | |
type | Journal Paper | |
journal volume | 42 | |
journal issue | 12 | |
journal title | Journal of Physical Oceanography | |
identifier doi | 10.1175/JPO-D-11-0191.1 | |
journal fristpage | 2206 | |
journal lastpage | 2228 | |
tree | Journal of Physical Oceanography:;2012:;Volume( 042 ):;issue: 012 | |
contenttype | Fulltext |