A state-space model for ocean drifter motions dominated by inertial oscillations
Coincident ocean drifter position and surface wind time series observed on hourly timescales are used to estimate upper ocean dissipation and atmosphere-ocean coupling coefficients in the Labrador Sea. A discrete-process model based on finite differences is used to regress ocean accelerations on oce...
Published in: | Journal of Geophysical Research |
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Language: | English |
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American Geophysical Union
2005
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-012-293 https://doi.org/10.1029/2004JC002850 |
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ftncar:oai:drupal-site.org:articles_9451 2023-07-30T04:04:43+02:00 A state-space model for ocean drifter motions dominated by inertial oscillations Bengtsson, T. (author) Milliff, R. (author) Jones, R. (author) Nychka, Doug (author) Niiler, P. (author) 2005-10-14 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-012-293 https://doi.org/10.1029/2004JC002850 en eng American Geophysical Union Journal of Geophysical Research-Oceans http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-012-293 doi:10.1029/2004JC002850 ISI:000232688300003 ark:/85065/d761114x Copyright 2005 American Geophysical Union. Text article 2005 ftncar https://doi.org/10.1029/2004JC002850 2023-07-17T18:29:11Z Coincident ocean drifter position and surface wind time series observed on hourly timescales are used to estimate upper ocean dissipation and atmosphere-ocean coupling coefficients in the Labrador Sea. A discrete-process model based on finite differences is used to regress ocean accelerations on ocean velocity estimates but fails because errors in the discrete approximations for the ocean velocities are biased and accumulate over time. Model identification is achieved by fitting a stochastic differential equation model based on classical upper ocean physics to the drifter data via the Kalman filter. Ocean parameters are shown to be nonidentifiable in a direct application to the Labrador Sea data when the known Coriolis parameter is not identified by the model. To address this, the ocean parameters are estimated in an empirical sequence. Data from the Ocean Storms experiment are used to estimate ocean dissipation in isolation from complexities introduced by strong and variable winds. Given a realistic estimate of the ocean dissipation, a second application in the Labrador Sea successfully estimates atmosphere-ocean coupling coefficients and reproduces the Coriolis parameter. Model assessments demonstrate the robustness of the parameter estimates. The model parameter estimates are discussed in comparison with Ekman theory and results from analyses of the global ocean surface drifter data set. Article in Journal/Newspaper Labrador Sea OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Journal of Geophysical Research 110 C10 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Coincident ocean drifter position and surface wind time series observed on hourly timescales are used to estimate upper ocean dissipation and atmosphere-ocean coupling coefficients in the Labrador Sea. A discrete-process model based on finite differences is used to regress ocean accelerations on ocean velocity estimates but fails because errors in the discrete approximations for the ocean velocities are biased and accumulate over time. Model identification is achieved by fitting a stochastic differential equation model based on classical upper ocean physics to the drifter data via the Kalman filter. Ocean parameters are shown to be nonidentifiable in a direct application to the Labrador Sea data when the known Coriolis parameter is not identified by the model. To address this, the ocean parameters are estimated in an empirical sequence. Data from the Ocean Storms experiment are used to estimate ocean dissipation in isolation from complexities introduced by strong and variable winds. Given a realistic estimate of the ocean dissipation, a second application in the Labrador Sea successfully estimates atmosphere-ocean coupling coefficients and reproduces the Coriolis parameter. Model assessments demonstrate the robustness of the parameter estimates. The model parameter estimates are discussed in comparison with Ekman theory and results from analyses of the global ocean surface drifter data set. |
author2 |
Bengtsson, T. (author) Milliff, R. (author) Jones, R. (author) Nychka, Doug (author) Niiler, P. (author) |
format |
Article in Journal/Newspaper |
title |
A state-space model for ocean drifter motions dominated by inertial oscillations |
spellingShingle |
A state-space model for ocean drifter motions dominated by inertial oscillations |
title_short |
A state-space model for ocean drifter motions dominated by inertial oscillations |
title_full |
A state-space model for ocean drifter motions dominated by inertial oscillations |
title_fullStr |
A state-space model for ocean drifter motions dominated by inertial oscillations |
title_full_unstemmed |
A state-space model for ocean drifter motions dominated by inertial oscillations |
title_sort |
state-space model for ocean drifter motions dominated by inertial oscillations |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-012-293 https://doi.org/10.1029/2004JC002850 |
genre |
Labrador Sea |
genre_facet |
Labrador Sea |
op_relation |
Journal of Geophysical Research-Oceans http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-012-293 doi:10.1029/2004JC002850 ISI:000232688300003 ark:/85065/d761114x |
op_rights |
Copyright 2005 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2004JC002850 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
C10 |
_version_ |
1772816288522960896 |