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Ansong, J.K.; Arbic, B.K.; Simmons, H.L.; Alford, M.H.; Buijsman, M.C.; Timko, P.G.; Richman, J.G.; Shriver, J.F.; Wallcraft, A.J. | ||||
| Title | Geographical Distribution of Diurnal and Semidiurnal Parametric Subharmonic Instability in a Global Ocean Circulation Model | Type | $loc['typeJournal Article'] | ||
| Year | 2018 | Publication | Journal of Physical Oceanography | Abbreviated Journal | J. Phys. Oceanogr. |
| Volume | 48 | Issue | 6 | Pages | 1409-1431 |
| Keywords | Baroclinic flows; Internal waves; Nonlinear dynamics; Ocean dynamics; Baroclinic models; Ocean models | ||||
| Abstract | The evidence for, baroclinic energetics of, and geographic distribution of parametric subharmonic instability (PSI) arising from both diurnal and semidiurnal tides in a global ocean general circulation model is investigated using 1/12.5° and 1/25° simulations that are forced by both atmospheric analysis fields and the astronomical tidal potential. The paper examines whether PSI occurs in the model, and whether it accounts for a significant fraction of the tidal baroclinic energy loss. Using energy transfer calculations and bispectral analyses, evidence is found for PSI around the critical latitudes of the tides. The intensity of both diurnal and semidiurnal PSI in the simulations is greatest in the upper ocean, consistent with previous results from idealized simulations, and quickly drops off about 5° from the critical latitudes. The sign of energy transfer depends on location; the transfer is positive (from the tides to subharmonic waves) in some locations and negative in others. The net globally integrated energy transfer is positive in all simulations and is 0.5%�10% of the amount of energy required to close the baroclinic energy budget in the model. The net amount of energy transfer is about an order of magnitude larger in the 1/25° semidiurnal simulation than the 1/12.5° one, implying the dependence of the rate of energy transfer on model resolution. | ||||
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| ISSN | 0022-3670 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ user @ | Serial | 976 | ||
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| Author |
Buijsman, M.C.; Ansong, J.K.; Arbic, B.K.; Richman, J.G.; Shriver, J.F.; Timko, P.G.; Wallcraft, A.J.; Whalen, C.B.; Zhao, Z.X. | ||||
| Title | Impact of Parameterized Internal Wave Drag on the Semidiurnal Energy Balance in a Global Ocean Circulation Model | Type | $loc['typeJournal Article'] | ||
| Year | 2016 | Publication | Journal of Physical Oceanography | Abbreviated Journal | J. Phys. Oceanogr. |
| Volume | 46 | Issue | 5 | Pages | 1399-1419 |
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| ISSN | 0022-3670 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 31 | ||
| 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. | ||||
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| 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 | 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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| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ user @ | Serial | 1036 | ||
| 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 | |
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| ISSN | 1463-5003 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ user @ | Serial | 1035 | ||
| Permanent link to this record | |||||
| Author |
MacKinnon, J.A.; Alford, M.H.; Ansong, J.K.; Arbic, B.K.; Barna, A.; Briegleb, B.P.; Bryan, F.O.; Buijsman, M.C.; Chassignet, E.P.; Danabasoglu, G.; Diggs, S.; Griffies, S.M.; Hallberg, R.W.; Jayne, S.R.; Jochum, M.; Klymak, J.M.; Kunze, E.; Large, W.G.; Legg, S.; Mater, B.; Melet, A.V.; Merchant, L.M.; Musgrave, R.; Nash, J.D.; Norton, N.J.; Pickering, A.; Pinkel, R.; Polzin, K.; Simmons, H.L.; St. Laurent, L.C.; Sun, O.M.; Trossman, D.S.; Waterhouse, A.F.; Whalen, C.B.; Zhao, Z. | ||||
| Title | Climate Process Team on Internal-Wave Driven Ocean Mixing | Type | $loc['typeJournal Article'] | ||
| Year | 2017 | Publication | Bulletin of the American Meteorological Society | Abbreviated Journal | Bull. Amer. Meteor. Soc. |
| Volume | 98 | Issue | 11 | Pages | 2429-2454 |
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0003-0007 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 66 | ||
| Permanent link to this record | |||||
| Author |
Nelson, A.D.; Arbic, B.K.; Zaron, E.D.; Savage, A.C.; Richman, J.G.; Buijsman, M.C.; Shriver, J.F. | ||||
| Title | Toward Realistic Nonstationarity of Semidiurnal Baroclinic Tides in a Hydrodynamic Model | Type | $loc['typeJournal Article'] | ||
| Year | 2019 | Publication | Journal of Geophysical Research: Oceans | Abbreviated Journal | J. Geophys. Res. Oceans |
| Volume | 124 | Issue | 9 | Pages | 6632-6641 |
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| Abstract | Semidiurnal baroclinic tide sea surface height (SSH) variance and semidiurnal nonstationary variance fraction (SNVF) are compared between a hydrodynamic model and altimetry for the low- to middle-latitude global ocean. Tidal frequencies are aliased by similar to 10-day altimeter sampling, which makes it impossible to unambiguously identify nonstationary tidal signals from the observations. In order to better understand altimeter sampling artifacts, the model was analyzed using its native hourly outputs and by subsampling it in the same manner as altimeters. Different estimates of the semidiurnal nonstationary and total SSH variance are obtained with the model depending on whether they are identified in the frequency domain or wave number domain and depending on the temporal sampling of the model output. Five sources of ambiguity in the interpretation of the altimetry are identified and briefly discussed. When the model and altimetry are analyzed in the same manner, they display qualitatively similar spatial patterns of semidiurnal baroclinic tides. The SNVF typically correlates above 80% at all latitudes between the different analysis methods and above 60% between the model and altimetry. The choice of analysis methodology was found to have a profound effect on estimates of the semidiurnal baroclinic SSH variance with the wave number domain methodology underestimating the semidiurnal nonstationary and total SSH variances by 68% and 66%, respectively. These results produce a SNVF estimate from altimetry that is biased low by a factor of 0.92. This bias is primarily a consequence of the ambiguity in the separation of tidal and mesoscale signals in the wave number domain. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 2169-9275 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ user @ | Serial | 1086 | ||
| Permanent link to this record | |||||
| Author |
Savage, A.C.; Arbic, B.K.; Richman, J.G.; Shriver, J.F.; Alford, M.H.; Buijsman, M.C.; Thomas Farrar, J.; Sharma, H.; Voet, G.; Wallcraft, A.J.; Zamudio, L. | ||||
| Title | Frequency content of sea surface height variability from internal gravity waves to mesoscale eddies | Type | $loc['typeJournal Article'] | ||
| Year | 2017 | Publication | Journal of Geophysical Research: Oceans | Abbreviated Journal | J. Geophys. Res. Oceans |
| Volume | 122 | Issue | 3 | Pages | 2519-2538 |
| Keywords | internal gravity waves; internal tides; spectral density | ||||
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| ISSN | 2169-9275 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 14 | ||
| Permanent link to this record | |||||
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