Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories
Mixing by mesoscale eddies in the ocean plays a major role in setting the distribution of oceanic tracers, with important implications for physical and biochemical systems at local to global scales. Roach et al. (2016; https://doi.org/10.1002/2015JC011440) demonstrated that a two-particle analysis o...
Published in: | Journal of Geophysical Research: Oceans |
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ftfloridastunidc:oai:fsu.digital.flvc.org:fsu_608774 2023-05-15T14:04:18+02:00 Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories Roach, Christopher J. (authoraut) Balwada, Dhruv (authoraut) Speer, Kevin (authoraut) 1 online resource computer application/pdf https://doi.org/10.1029/2018JC013750 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000441888200008 http://fsu.digital.flvc.org/islandora/object/fsu%3A608774/datastream/TN/view/Global%20Observations%20Of%20Horizontal%20Mixing%20From%20Argo%20Float%20And%20Surface%20Drifter%20Trajectories.jpg English eng eng Journal of Geophysical Research-Oceans--2169-9275 Text journal article ftfloridastunidc https://doi.org/10.1029/2018JC013750 2020-08-10T18:35:04Z Mixing by mesoscale eddies in the ocean plays a major role in setting the distribution of oceanic tracers, with important implications for physical and biochemical systems at local to global scales. Roach et al. (2016; https://doi.org/10.1002/2015JC011440) demonstrated that a two-particle analysis of Argo trajectories produces robust estimates of horizontal mixing in the Southern Ocean. Here we extend this analysis to produce global 1 degrees x1 degrees maps of eddy diffusivity at the nominal Argo parking depth of 1,000 m. We also applied this methodology to estimate surface eddy diffusivities from Global Drifter Program (GDP) surface drifters. The global mean eddy diffusivity was 543 +/- 155 m(2)/s at 1,000m and 2637 +/- 311 m(2)/s at the surface, with elevated diffusivities in regions of enhanced eddy kinetic energy, such as western boundary currents and along the Antarctic Circumpolar Current. The eddy kinetic energy at the equator is high at both the surface and depth, but the eddy diffusivity is only enhanced near the surface. At depth the eddy diffusivity is strongly suppressed due to the presence of mean flow. We used our observational estimates to test the validity of an eddy diffusivity parameterization that accounts for mixing suppression in the presence of zonal mean flows. Our results indicated that this parameterization generally agrees with the directly observed eddy diffusivities in the midlatitude and high-latitude oceans. variability, parameterization, north-atlantic, pacific-ocean, southern-ocean, overturning circulation, Argo floats, drifters, isopycnal mixing, Lagrangian methods, lateral eddy diffusivity, ocean circulation models, relative dispersion, tracer The publisher’s version of record is available at https://doi.org/10.1029/2018JC013750 Article in Journal/Newspaper Antarc* Antarctic North Atlantic Southern Ocean Florida State University Digital Library (FSUDL) Antarctic Pacific Southern Ocean The Antarctic Journal of Geophysical Research: Oceans 123 7 4560 4575 |
institution |
Open Polar |
collection |
Florida State University Digital Library (FSUDL) |
op_collection_id |
ftfloridastunidc |
language |
English |
description |
Mixing by mesoscale eddies in the ocean plays a major role in setting the distribution of oceanic tracers, with important implications for physical and biochemical systems at local to global scales. Roach et al. (2016; https://doi.org/10.1002/2015JC011440) demonstrated that a two-particle analysis of Argo trajectories produces robust estimates of horizontal mixing in the Southern Ocean. Here we extend this analysis to produce global 1 degrees x1 degrees maps of eddy diffusivity at the nominal Argo parking depth of 1,000 m. We also applied this methodology to estimate surface eddy diffusivities from Global Drifter Program (GDP) surface drifters. The global mean eddy diffusivity was 543 +/- 155 m(2)/s at 1,000m and 2637 +/- 311 m(2)/s at the surface, with elevated diffusivities in regions of enhanced eddy kinetic energy, such as western boundary currents and along the Antarctic Circumpolar Current. The eddy kinetic energy at the equator is high at both the surface and depth, but the eddy diffusivity is only enhanced near the surface. At depth the eddy diffusivity is strongly suppressed due to the presence of mean flow. We used our observational estimates to test the validity of an eddy diffusivity parameterization that accounts for mixing suppression in the presence of zonal mean flows. Our results indicated that this parameterization generally agrees with the directly observed eddy diffusivities in the midlatitude and high-latitude oceans. variability, parameterization, north-atlantic, pacific-ocean, southern-ocean, overturning circulation, Argo floats, drifters, isopycnal mixing, Lagrangian methods, lateral eddy diffusivity, ocean circulation models, relative dispersion, tracer The publisher’s version of record is available at https://doi.org/10.1029/2018JC013750 |
author2 |
Roach, Christopher J. (authoraut) Balwada, Dhruv (authoraut) Speer, Kevin (authoraut) |
format |
Article in Journal/Newspaper |
title |
Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories |
spellingShingle |
Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories |
title_short |
Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories |
title_full |
Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories |
title_fullStr |
Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories |
title_full_unstemmed |
Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories |
title_sort |
global observations of horizontal mixing from argo float and surface drifter trajectories |
url |
https://doi.org/10.1029/2018JC013750 http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000441888200008 http://fsu.digital.flvc.org/islandora/object/fsu%3A608774/datastream/TN/view/Global%20Observations%20Of%20Horizontal%20Mixing%20From%20Argo%20Float%20And%20Surface%20Drifter%20Trajectories.jpg |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Southern Ocean |
op_relation |
Journal of Geophysical Research-Oceans--2169-9275 |
op_doi |
https://doi.org/10.1029/2018JC013750 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
7 |
container_start_page |
4560 |
op_container_end_page |
4575 |
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1766275333296750592 |