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Author
Ali, A. ; Christensen, K.H. ; Breivik, Ø. ; Malila, M. ; Raj, R.P. ; Bertino, L. ; Chassignet, E.P. ; Bakhoday-Paskyabi, M.
Title
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans
Type
$loc['typeJournal Article']
Year
2019
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
137
Issue
Pages
76-97
Keywords
Langmuir mixing parameterization Mixed layer depth Sea surface temperature Ocean heat content Stokes penetration depth
Abstract
Five different parameterizations of Langmuir turbulence (LT) effect are investigated in a realistic model of the North Atlantic and Arctic using realistic wave forcing from a global wave hindcast. The parameterizations mainly apply an enhancement to the turbulence velocity scale, and/or to the entrainment buoyancy flux in the surface boundary layer. An additional run is also performed with other wave effects to assess the relative importance of Langmuir turbulence, namely the Coriolis-Stokes forcing, Stokes tracer advection and wave-modified momentum fluxes. The default model (without wave effects) underestimates the mixed layer depth in summer and overestimates it at high latitudes in the winter. The results show that adding LT mixing reduces shallow mixed layer depth (MLD) biases, particularly in the subtropics all year-around, and in the Nordic Seas in summer. There is overall a stronger relative impact on the MLD during winter than during summer. In particular, the parameterization with the most vigorous LT effect causes winter MLD increases by more than 50% relative to a control run without Langmuir mixing. On the contrary, the parameterization which assumes LT effects on the entrainment buoyancy flux and accounts for the Stokes penetration depth is able to enhance the mixing in summer more than in winter. This parametrization is also distinct from the others because it restrains the LT mixing in regions of deep MLD biases, so it is the preferred choice for our purpose. The different parameterizations do not change the amplitude or phase of the seasonal cycle of heat content but do influence its long-term trend, which means that the LT can influence the drift of ocean models. The combined impact on water mass properties from the Coriolis-Stokes force, the Stokes drift tracer advection, and the wave-dependent momentum fluxes is negligible compared to the effect from the parameterized Langmuir turbulence.
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Series Editor
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Series Issue
Edition
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1463-5003
ISBN
Medium
Area
Expedition
Conference
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Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1001
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Author
Jeon, C.-H. ; Buijsman, M.C. ; Wallcraft, A.J. ; Shriver, J.F. ; Arbic, B.K. ; Richman, J.G. ; Hogan, P.J.
Title
Improving surface tidal accuracy through two-way nesting in a global ocean model
Type
$loc['typeJournal Article']
Year
2019
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
137
Issue
Pages
98-113
Keywords
Two-way nesting ; HYCOM ; Barotropic tides ; OASIS3-MCT ; FES2014 ; TPXO9-atlas
Abstract
In global ocean simulations, forward (non-data-assimilative) tide models generally feature large sea-surface-height errors near Hudson Strait in the North Atlantic Ocean with respect to altimetry-constrained tidal solutions. These errors may be associated with tidal resonances that are not well resolved by the complex coastal-shelf bathymetry in low-resolution simulations. An online two-way nesting framework has been implemented to improve global surface tides in the HYbrid Coordinate Ocean Model (HYCOM). In this framework, a high-resolution child domain, covering Hudson Strait, is coupled with a relatively low-resolution parent domain for computational efficiency. Data such as barotropic pressure and velocity are exchanged between the child and parent domains with the external coupler OASIS3-MCT. The developed nesting framework is validated with semi-idealized basin-scale model simulations. The M2 sea-surface heights show very good accuracy in the one-way and two-way nesting simulations in Hudson Strait, where large tidal elevations are observed. In addition, the mass and tidal energy flux are not adversely impacted at the nesting boundaries in the semi-idealized simulations. In a next step, the nesting framework is applied to a realistic global tide simulation. In this simulation, the resolution of the child domain (1/75°) is three times as fine as that of the parent domain (1/25°). The M2 sea-surface-height root-mean-square errors with tide gauge data and the altimetry-constrained global FES2014 and TPXO9-atlas tidal solutions are evaluated for the nesting and no-nesting solutions. The better resolved coastal bathymetry and the finer grid in the child domain improve the local tides in Hudson Strait and Bay, and the back-effect of the coastal tides induces an improvement of the barotropic tides in the open ocean of the Atlantic.
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Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
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Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1036
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Author
Rahaman, H. ; Srinivasu, U. ; Panickal, S. ; Durgadoo, J.V. ; Griffies, S.M. ; Ravichandran, M. ; Bozec, A. ; Cherchi, A. ; Voldoire, A. ; Sidorenko, D.. ; Chassignet, E.P. ; Danabasoglu, G. ; Tsujino, H. ; Getzlaff, K. ; Ilicak, M. ; Bentsen, M. ; Long, M.C. ; Fogli, P.G. ; Farneti, R. ; Danilov, S. ; Marsland, S.J. ; Valcke, S. ; Yeager, S.G. ; Wang, Q.
Title
An assessment of the Indian Ocean mean state and seasonal cycle in a suite of interannual CORE-II simulations
Type
$loc['typeJournal Article']
Year
2020
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
145
Issue
Pages
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1087
Permanent link to this record
Author
Timko, P.G. ; Arbic, B.K. ; Hyder, P. ; Richman, J.G. ; Zamudio, L. ; O'Dea, E. ; Wallcraft, A.J. ; Shriver, J.F.
Title
Assessment of shelf sea tides and tidal mixing fronts in a global ocean model
Type
$loc['typeJournal Article']
Year
2019
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
136
Issue
Pages
66-84
Keywords
HYCOM ; tides ; seasonal tidal mixing
Abstract
Tidal mixing fronts, which represent boundaries between stratified and tidally mixed waters, are locations of enhanced biological activity. They occur in summer shelf seas when, in the presence of strong tidal currents, mixing due to bottom friction balances buoyancy production due to seasonal heat flux. In this paper we examine the occurrence and fidelity of tidal mixing fronts in shelf seas generated within a global 3-dimensional simulation of the HYbrid Coordinate Ocean Model (HYCOM) that is simultaneously forced by atmospheric fields and the astronomical tidal potential. We perform a first order assessment of shelf sea tides in global HYCOM through comparison of sea surface temperature, sea surface tidal elevations, and tidal currents with observations. HYCOM was tuned to minimize errors in M2 sea surface heights in deep water. Over the global coastal and shelf seas (depths <200 m) the area-weighted root mean square error of the M2 sea surface amplitude in HYCOM represents 35% of the 50 cm root mean squared M2 sea surface amplitude when compared to satellite constrained models TPXO8 and FES2014. HYCOM and the altimeter constrained tidal models TPXO8 and FES2014 exhibit similar skill in reproducing barotropic tidal currents estimated from in-situ current meter observations. Through comparison of a global HYCOM simulation with tidal forcing to a global HYCOM simulation with no tides, and also to previous regional studies of tidal mixing fronts in shelf seas, we demonstrate that HYCOM with embedded tides exhibits quite high skill in reproducing known tidal mixing fronts in shelf seas. Our results indicate that the amount of variability in the location of the tidal mixing fronts in HYCOM, estimated using the Simpson-Hunter parameter, is consistent with previous studies when the differences in the net downward heat flux, on a global scale, are taken into account. We also provide evidence of tidal mixing fronts on the North West Australian Shelf for which we have been unable to find references in the existing scientific literature.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1032
Permanent link to this record
Author
Jeon, C.-H. ; Buijsman, M.C. ; Wallcraft, A.J. ; Shriver, J.F. ; Arbic, B.K. ; Richman, J.G. ; Hogan, P.J.
Title
Improving surface tidal accuracy through two-way nesting in a global ocean model
Type
$loc['typeJournal Article']
Year
2019
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
137
Issue
Pages
98-113
Keywords
Two-way nesting ; HYCOM ; Barotropic tides ; OASIS3-MCT ; FES2014 ; TPXO9-atlas
Abstract
In global ocean simulations, forward (non-data-assimilative) tide models generally feature large sea-surface-height errors near Hudson Strait in the North Atlantic Ocean with respect to altimetry-constrained tidal solutions. These errors may be associated with tidal resonances that are not well resolved by the complex coastal-shelf bathymetry in low-resolution simulations. An online two-way nesting framework has been implemented to improve global surface tides in the HYbrid Coordinate Ocean Model (HYCOM). In this framework, a high-resolution child domain, covering Hudson Strait, is coupled with a relatively low-resolution parent domain for computational efficiency. Data such as barotropic pressure and velocity are exchanged between the child and parent domains with the external coupler OASIS3-MCT. The developed nesting framework is validated with semi-idealized basin-scale model simulations. The M2 sea-surface heights show very good accuracy in the one-way and two-way nesting simulations in Hudson Strait, where large tidal elevations are observed. In addition, the mass and tidal energy flux are not adversely impacted at the nesting boundaries in the semi-idealized simulations. In a next step, the nesting framework is applied to a realistic global tide simulation. In this simulation, the resolution of the child domain (1/75°) is three times as fine as that of the parent domain (1/25°). The M2 sea-surface-height root-mean-square errors with tide gauge data and the altimetry-constrained global FES2014 and TPXO9-atlas tidal solutions are evaluated for the nesting and no-nesting solutions. The better resolved coastal bathymetry and the finer grid in the child domain improve the local tides in Hudson Strait and Bay, and the back-effect of the coastal tides induces an improvement of the barotropic tides in the open ocean of the Atlantic.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1034
Permanent link to this record
Author
Jeon, C.-H. ; Buijsman, M.C. ; Wallcraft, A.J. ; Shriver, J.F. ; Arbic, B.K. ; Richman, J.G. ; Hogan, P.J.
Title
Improving surface tidal accuracy through two-way nesting in a global ocean model
Type
$loc['typeJournal Article']
Year
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
Issue
Pages
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1035
Permanent link to this record
Author
van Sebille, E. ; Griffies, S.M. ; Abernathey, R. ; Adams, T.P. ; Berloff, P. ; Biastoch, A. ; Blanke, B. ; Chassignet, E.P. ; Cheng, Y. ; Cotter, C.J. ; Deleersnijder, E. ; Döös, K. ; Drake, H.F. ; Drijfhout, S. ; Gary, S.F. ; Heemink, A.W. ; Kjellsson, J. ; Koszalka, I.M. ; Lange, M. ; Lique, C. ; MacGilchrist, G.A. ; Marsh, R. ; Mayorga Adame, C.G. ; McAdam, R. ; Nencioli, F. ; Paris, C.B. ; Piggott, M.D. ; Polton, J.A. ; Rühs, S. ; Shah, S.H.A.M. ; Thomas, M.D. ; Wang, J. ; Wolfram, P.J. ; Zanna, L. ; Zika, J.D.
Title
Lagrangian ocean analysis: Fundamentals and practices
Type
$loc['typeJournal Article']
Year
2018
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
121
Issue
Pages
49-75
Keywords
Ocean circulation ; Lagrangian analysis ; Connectivity ; Particle tracking ; Future modelling
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
466
Permanent link to this record
Author
Tseng, Y.-heng ; Lin, H. ; Chen, H.-ching ; Thompson, K. ; Bentsen, M. ; Böning, C.W. ; Bozec, A. ; Cassou, C. ; Chassignet, E. ; Chow, C.H. ; Danabasoglu, G. ; Danilov, S. ; Farneti, R. ; Fogli, P.G. ; Fujii, Y. ; Griffies, S.M. ; Ilicak, M. ; Jung, T. ; Masina, S. ; Navarra, A. ; Patara, L. ; Samuels, B.L. ; Scheinert, M. ; Sidorenko, D. ; Sui, C.-H. ; Tsujino, H. ; Valcke, S. ; Voldoire, A. ; Wang, Q. ; Yeager, S.G.
Title
North and equatorial Pacific Ocean circulation in the CORE-II hindcast simulations
Type
$loc['typeJournal Article']
Year
2016
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
104
Issue
Pages
143-170
Keywords
CORE global ocean-ice simulations ; Kuroshio ; Mode water ; Subtropical cell ; North Pacific simulations
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
55
Permanent link to this record
Author
Ilicak, M. ; Drange, H. ; Wang, Q. ; Gerdes, R. ; Aksenov, Y. ; Bailey, D. ; Bentsen, M. ; Biastoch, A. ; Bozec, A. ; Böning, C. ; Cassou, C. ; Chassignet, E. ; Coward, A.C. ; Curry, B. ; Danabasoglu, G. ; Danilov, S. ; Fernandez, E. ; Fogli, P.G. ; Fujii, Y. ; Griffies, S.M. ; Iovino, D. ; Jahn, A. ; Jung, T. ; Large, W.G. ; Lee, C. ; Lique, C. ; Lu, J. ; Masina, S. ; George Nurser, A.J. ; Roth, C. ; Salas y Mélia, D. ; Samuels, B.L. ; Spence, P. ; Tsujino, H. ; Valcke, S. ; Voldoire, A. ; Wang, X. ; Yeager, S.G.
Title
An assessment of the Arctic Ocean in a suite of interannual CORE-II simulations. Part III: Hydrography and fluxes
Type
$loc['typeJournal Article']
Year
2016
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
100
Issue
Pages
141-161
Keywords
Arctic Ocean ; Atlantic Water ; St. Anna Trough ; Density currents ; CORE-II atmospheric forcing
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
80
Permanent link to this record
Author
Danabasoglu, G. ; Yeager, S.G. ; Kim, W.M. ; Behrens, E. ; Bentsen, M. ; Bi, D. ; Biastoch, A. ; Bleck, R. ; Böning, C. ; Bozec, A. ; Canuto, V.M. ; Cassou, C. ; Chassignet, E. ; Coward, A.C. ; Danilov, S. ; Diansky, N. ; Drange, H. ; Farneti, R. ; Fernandez, E. ; Fogli, P.G. ; Forget, G. ; Fujii, Y. ; Griffies, S.M. ; Gusev, A. ; Heimbach, P. ; Howard, A. ; Ilicak, M. ; Jung, T. ; Karspeck, A.R. ; Kelley, M. ; Large, W.G. ; Leboissetier, A. ; Lu, J. ; Madec, G. ; Marsland, S.J. ; Masina, S. ; Navarra, A. ; Nurser, A.J.G. ; Pirani, A. ; Romanou, A. ; Salas y Mélia, D. ; Samuels, B.L. ; Scheinert, M. ; Sidorenko, D. ; Sun, S. ; Treguier, A.-M. ; Tsujino, H. ; Uotila, P. ; Valcke, S. ; Voldoire, A. ; Wang, Q. ; Yashayaev, I.
Title
North Atlantic simulations in Coordinated Ocean-ice Reference Experiments phase II (CORE-II). Part II: Inter-annual to decadal variability
Type
$loc['typeJournal Article']
Year
2016
Publication
Ocean Modelling
Abbreviated Journal
Ocean Modelling
Volume
97
Issue
Pages
65-90
Keywords
Global ocean – sea-ice modelling ; Ocean model comparisons ; Atmospheric forcing ; Inter-annual to decadal variability and mechanisms ; Atlantic meridional overturning circulation variability ; Variability in the North Atlantic
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1463-5003
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
34
Permanent link to this record