Total kinetic energy in four global eddying ocean circulation models and over 5000 current meter records

Handle URI:
http://hdl.handle.net/10754/600039
Title:
Total kinetic energy in four global eddying ocean circulation models and over 5000 current meter records
Authors:
Scott, Robert B.; Arbic, Brian K.; Chassignet, Eric P.; Coward, Andrew C.; Maltrud, Mathew; Merryfield, William J.; Srinivasan, Ashwanth; Varghese, Anson
Abstract:
We compare the total kinetic energy (TKE) in four global eddying ocean circulation simulations with a global dataset of over 5000, quality controlled, moored current meter records. At individual mooring sites, there was considerable scatter between models and observations that was greater than estimated statistical uncertainty. Averaging over all current meter records in various depth ranges, all four models had mean TKE within a factor of two of observations above 3500. m, and within a factor of three below 3500. m. With the exception of observations between 20 and 100. m, the models tended to straddle the observations. However, individual models had clear biases. The free running (no data assimilation) model biases were largest below 2000. m. Idealized simulations revealed that the parameterized bottom boundary layer tidal currents were not likely the source of the problem, but that reducing quadratic bottom drag coefficient may improve the fit with deep observations. Data assimilation clearly improved the model-observation comparison, especially below 2000. m, despite assimilated data existing mostly above this depth and only south of 47°N. Different diagnostics revealed different aspects of the comparison, though in general the models appeared to be in an eddying-regime with TKE that compared reasonably well with observations. © 2010 Elsevier Ltd.
Citation:
Scott RB, Arbic BK, Chassignet EP, Coward AC, Maltrud M, et al. (2010) Total kinetic energy in four global eddying ocean circulation models and over 5000 current meter records. Ocean Modelling 32: 157–169. Available: http://dx.doi.org/10.1016/j.ocemod.2010.01.005.
Publisher:
Elsevier BV
Journal:
Ocean Modelling
Issue Date:
Jan-2010
DOI:
10.1016/j.ocemod.2010.01.005
Type:
Article
ISSN:
1463-5003
Sponsors:
We benefitted from conversations with Carl Wunsch. Two anonymous reviews helped improve the manuscript. We are grateful to Carl Wunsch for contributing generously to our CMA, and to the Buoy Group at Oregon State University for maintaining their Deep Water Archive (OSU DWA).R.B.S. thanks the National Oceanography Centre, Southampton (NOCS) for hosting an extended visit. The authors acknowledge the Texas Advanced Computing Center (TACC) at The University of Texas at Austin for providing High-Performance Computing (HPC) resources that have contributed to the research results reported within this paper, http://www.tacc.utexas.edu. R.B.S. was supported by National Science Foundation (NSF) grants OCE-0526412 and OCE-0851457, a grant from King Abdullah University of Science and Technology (KAUST), and NOCS. B.K.A. and A.V. were supported by NSF grant OCE-0623159 and a Jackson School of Geosciences Development Grant. M.M. was supported by the DOE Office of Science Climate Change Prediction Program. This is UTIG contribution #2182.This paper is dedicated to the memory of the great physical oceanographer and journal editor Peter Killworth.
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Full metadata record

DC FieldValue Language
dc.contributor.authorScott, Robert B.en
dc.contributor.authorArbic, Brian K.en
dc.contributor.authorChassignet, Eric P.en
dc.contributor.authorCoward, Andrew C.en
dc.contributor.authorMaltrud, Mathewen
dc.contributor.authorMerryfield, William J.en
dc.contributor.authorSrinivasan, Ashwanthen
dc.contributor.authorVarghese, Ansonen
dc.date.accessioned2016-02-28T06:34:50Zen
dc.date.available2016-02-28T06:34:50Zen
dc.date.issued2010-01en
dc.identifier.citationScott RB, Arbic BK, Chassignet EP, Coward AC, Maltrud M, et al. (2010) Total kinetic energy in four global eddying ocean circulation models and over 5000 current meter records. Ocean Modelling 32: 157–169. Available: http://dx.doi.org/10.1016/j.ocemod.2010.01.005.en
dc.identifier.issn1463-5003en
dc.identifier.doi10.1016/j.ocemod.2010.01.005en
dc.identifier.urihttp://hdl.handle.net/10754/600039en
dc.description.abstractWe compare the total kinetic energy (TKE) in four global eddying ocean circulation simulations with a global dataset of over 5000, quality controlled, moored current meter records. At individual mooring sites, there was considerable scatter between models and observations that was greater than estimated statistical uncertainty. Averaging over all current meter records in various depth ranges, all four models had mean TKE within a factor of two of observations above 3500. m, and within a factor of three below 3500. m. With the exception of observations between 20 and 100. m, the models tended to straddle the observations. However, individual models had clear biases. The free running (no data assimilation) model biases were largest below 2000. m. Idealized simulations revealed that the parameterized bottom boundary layer tidal currents were not likely the source of the problem, but that reducing quadratic bottom drag coefficient may improve the fit with deep observations. Data assimilation clearly improved the model-observation comparison, especially below 2000. m, despite assimilated data existing mostly above this depth and only south of 47°N. Different diagnostics revealed different aspects of the comparison, though in general the models appeared to be in an eddying-regime with TKE that compared reasonably well with observations. © 2010 Elsevier Ltd.en
dc.description.sponsorshipWe benefitted from conversations with Carl Wunsch. Two anonymous reviews helped improve the manuscript. We are grateful to Carl Wunsch for contributing generously to our CMA, and to the Buoy Group at Oregon State University for maintaining their Deep Water Archive (OSU DWA).R.B.S. thanks the National Oceanography Centre, Southampton (NOCS) for hosting an extended visit. The authors acknowledge the Texas Advanced Computing Center (TACC) at The University of Texas at Austin for providing High-Performance Computing (HPC) resources that have contributed to the research results reported within this paper, http://www.tacc.utexas.edu. R.B.S. was supported by National Science Foundation (NSF) grants OCE-0526412 and OCE-0851457, a grant from King Abdullah University of Science and Technology (KAUST), and NOCS. B.K.A. and A.V. were supported by NSF grant OCE-0623159 and a Jackson School of Geosciences Development Grant. M.M. was supported by the DOE Office of Science Climate Change Prediction Program. This is UTIG contribution #2182.This paper is dedicated to the memory of the great physical oceanographer and journal editor Peter Killworth.en
dc.publisherElsevier BVen
dc.subjectEddying OGCMen
dc.subjectKinetic energyen
dc.subjectModel intercomparisonen
dc.subjectModel validationen
dc.subjectMoored current metersen
dc.titleTotal kinetic energy in four global eddying ocean circulation models and over 5000 current meter recordsen
dc.typeArticleen
dc.identifier.journalOcean Modellingen
dc.contributor.institutionUniversity of Texas at Austin, Austin, United Statesen
dc.contributor.institutionFlorida State University, Tallahassee, United Statesen
dc.contributor.institutionNational Oceanography Centre Southampton, Southampton, United Kingdomen
dc.contributor.institutionLos Alamos National Laboratory, Los Alamos, United Statesen
dc.contributor.institutionUniversity of Victoria, Victoria, Canadaen
dc.contributor.institutionRosenstiel School of Marine and Atmospheric Science, Miami, United Statesen
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