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...
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ftfloridasu:oai:diginole.lib.fsu.edu:fsu_608774 2024-06-09T07:39:59+00:00 Global Observations Of Horizontal Mixing From Argo Float And Surface Drifter Trajectories Roach, Christopher J. (authoraut) Balwada, Dhruv (authoraut) Speer, Kevin (authoraut) 2018-07-01 1 online resource computer https://diginole.lib.fsu.edu/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 fsu:608774 (IID) FSU_libsubv1_wos_000441888200008 (DOI) 10.1029/2018JC013750 https://diginole.lib.fsu.edu/islandora/object/fsu%3A608774/datastream/TN/view/Global%20Observations%20Of%20Horizontal%20Mixing%20From%20Argo%20Float%20And%20Surface%20Drifter%20Trajectories.jpg Text journal article 2018 ftfloridasu 2024-05-10T08:08:10Z 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. Keywords: 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 Publication Note: 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: DigiNole Commons Antarctic Pacific Southern Ocean The Antarctic |
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Open Polar |
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Florida State University: DigiNole Commons |
op_collection_id |
ftfloridasu |
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. Keywords: 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 Publication Note: 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 |
publishDate |
2018 |
url |
https://diginole.lib.fsu.edu/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 fsu:608774 (IID) FSU_libsubv1_wos_000441888200008 (DOI) 10.1029/2018JC013750 https://diginole.lib.fsu.edu/islandora/object/fsu%3A608774/datastream/TN/view/Global%20Observations%20Of%20Horizontal%20Mixing%20From%20Argo%20Float%20And%20Surface%20Drifter%20Trajectories.jpg |
_version_ |
1801383501372588032 |