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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.
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
1001
Permanent link to this record
Author
Aretxabaleta, A. ; Blanton, B.O. ; Seim, H.E. ; Werner, F.E. ; Nelson, J.R. ; Chassignet, E.P.
Title
Cold event in the South Atlantic Bight during summer of 2003: Model simulations and implications
Type
$loc['typeJournal Article']
Year
2007
Publication
Journal of Geophysical Research
Abbreviated Journal
J. Geophys. Res.
Volume
112
Issue
C5
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
0148-0227
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
427
Permanent link to this record
Author
Bozec, A. ; Lozier, M.S. ; Chassignet, E.P. ; Halliwell, G.R.
Title
On the variability of the Mediterranean Outflow Water in the North Atlantic from 1948 to 2006
Type
$loc['typeJournal Article']
Year
2011
Publication
Journal of Geophysical Research
Abbreviated Journal
J. Geophys. Res.
Volume
116
Issue
C9
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
0148-0227
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
290
Permanent link to this record
Author
Chassignet, E.P. ; Xu, X.
Title
Impact of Horizontal Resolution (1/12° to 1/50°) on Gulf Stream Separation, Penetration, and Variability
Type
$loc['typeJournal Article']
Year
2017
Publication
Journal of Physical Oceanography
Abbreviated Journal
J. Phys. Oceanogr.
Volume
47
Issue
8
Pages
1999-2021
Keywords
Ocean ; Boundary currents ; Eddies ; Mesoscale processes ; Ocean circulation ; Ocean dynamics
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
0022-3670
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
17
Permanent link to this record
Author
Coleman, F.C. ; Chanton, J.P. ; Chassignet, E.P.
Title
Ecological Connectivity in Northeastern Gulf of Mexico – The Deep-C Initiative
Type
$loc['typeConference Article']
Year
2014
Publication
International Oil Spill Conference Proceedings
Abbreviated Journal
International Oil Spill Conference Proceedings
Volume
2014
Issue
1
Pages
1972-1984
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
2169-3366
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
158
Permanent link to this record
Author
Davidson, F. ; Alvera-Azcárate, A. ; Barth, A. ; Brassington, G.B. ; Chassignet, E.P. ; Clementi, E. ; De Mey-Frémaux, P. ; Divakaran, P. ; Harris, C. ; Hernandez, F. ; Hogan, P. ; Hole, L.R. ; Holt, J. ; Liu, G. ; Lu, Y. ; Lorente, P. ; Maksymczuk, J. ; Martin, M. ; Mehra, A. ; Melsom, A. ; Mo, H. ; Moore, A. ; Oddo, P. ; Pascual, A. ; Pequignet, A.-C. ; Kourafalou, V. ; Ryan, A. ; Siddorn, J. ; Smith, G. ; Spindler, D. ; Spindler, T. ; Stanev, E.V. ; Staneva, J. ; Storto, A. ; Tanajura, C. ; Vinayachandran, P.N. ; Wan, L. ; Wang, H. ; Zhang, Y. ; Zhu, X. ; Zu, Z.
Title
Synergies in Operational Oceanography: The Intrinsic Need for Sustained Ocean Observations
Type
$loc['typeJournal Article']
Year
2019
Publication
Frontiers in Marine Science
Abbreviated Journal
Front. Mar. Sci.
Volume
6
Issue
Pages
Keywords
Abstract
Operational oceanography can be described as the provision of routine oceanographic information needed for decision-making purposes. It is dependent upon sustained research and development through the end-to-end framework of an operational service, from observation collection to delivery mechanisms. The core components of operational oceanographic systems are a multi-platform observation network, a data management system, a data assimilative prediction system, and a dissemination/accessibility system. These are interdependent, necessitating communication and exchange between them, and together provide the mechanism through which a clear picture of ocean conditions, in the past, present, and future, can be seen. Ocean observations play a critical role in all aspects of operational oceanography, not only for assimilation but as part of the research cycle, and for verification and validation of products. Data assimilative prediction systems are advancing at a fast pace, in tandem with improved science and the growth in computing power. To make best use of the system capability these advances would be matched by equivalent advances in operational observation coverage. This synergy between the prediction and observation systems underpins the quality of products available to stakeholders, and justifies the need for sustained ocean observations. In this white paper, the components of an operational oceanographic system are described, highlighting the critical role of ocean observations, and how the operational systems will evolve over the next decade to improve the characterization of ocean conditions, including at finer spatial and temporal scales.
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
2296-7745
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1083
Permanent link to this record
Author
Deremble, B. ; Dewar, W.K. ; Chassignet, E.P.
Title
Vorticity dynamics near sharp topographic features
Type
$loc['typeJournal Article']
Year
2016
Publication
Journal of Marine Research
Abbreviated Journal
J Mar Res
Volume
74
Issue
6
Pages
249-276
Keywords
vorticity conservation ; point vortex ; vortex sheet ; singularities
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
0022-2402
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
231
Permanent link to this record
Author
Dukhovskoy, D.S. ; Leben, R.R. ; Chassignet, E.P. ; Hall, C.A. ; Morey, S.L. ; Nedbor-Gross, R.
Title
Characterization of the uncertainty of loop current metrics using a multidecadal numerical simulation and altimeter observations
Type
$loc['typeJournal Article']
Year
2015
Publication
Deep Sea Research Part I: Oceanographic Research Papers
Abbreviated Journal
Deep Sea Research Part I: Oceanographic Research Papers
Volume
100
Issue
Pages
140-158
Keywords
Eddies and mesoscale processes ; Gulf of Mexico ; Loop Current ; Satellite altimetry ; Ocean modeling ; Ocean front detection
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
0967-0637
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
100
Permanent link to this record
Author
Dukhovskoy, D.S. ; Yashayaev, I. ; Proshutinsky, A. ; Bamber, J.L. ; Bashmachnikov, I.L. ; Chassignet, E.P. ; Lee, C.M. ; Tedstone, A.J.
Title
Role of Greenland Freshwater Anomaly in the Recent Freshening of the Subpolar North Atlantic
Type
$loc['typeJournal Article']
Year
2019
Publication
Journal of Geophysical Research: Oceans
Abbreviated Journal
J. Geophys. Res. Oceans
Volume
124
Issue
5
Pages
3333-3360
Keywords
Greenland ice sheet melting ; freshwater anomaly ; subpolar North Atlantic ; subpolar gyre ; passive tracer numerical experiment ; freshwater budget
Abstract
The cumulative Greenland freshwater flux anomaly has exceeded 5000 km3 since the 1990s. The volume of this surplus fresh water is expected to cause substantial freshening in the North Atlantic. Analysis of hydrographic observations in the subpolar seas reveal freshening signals in the 2010s. The sources of this freshening are yet to be determined. In this study, the relationship between the surplus Greenland freshwater flux and this freshening is tested by analyzing the propagation of the Greenland freshwater anomaly and its impact on salinity in the subpolar North Atlantic based on observational data and numerical experiments with and without the Greenland runoff. A passive tracer is continuously released during the simulations at freshwater sources along the coast of Greenland to track the Greenland freshwater anomaly. Tracer budget analysis shows that 44% of the volume of the Greenland freshwater anomaly is retained in the subpolar North Atlantic by the end of the simulation. This volume is sufficient to cause strong freshening in the subpolar seas if it stays in the upper 50�100 m. However, in the model the anomaly is mixed down to several hundred meters of the water column resulting in smaller magnitudes of freshening compared to the observations. Therefore, the simulations suggest that the accelerated Greenland melting would not be sufficient to cause the observed freshening in the subpolar seas and other sources of fresh water have contributed to the freshening. Impacts on salinity in the subpolar seas of the freshwater transport through Fram Strait and precipitation are discussed.
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
2169-9275
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1029
Permanent link to this record
Author
Fox-Kemper, B. ; Adcroft, A. ; Böning, C.W. ; Chassignet, E.P. ; Curchitser, E. ; Danabasoglu, G. ; Eden, C. ; England, M.H. ; Gerdes, R. ; Greatbatch, R.J. ; Griffies, S.M. ; Hallberg, R.W. ; Hanert, E. ; Heimbach, P. ; Hewitt, H.T. ; Hill, C.N. ; Komuro, Y. ; Legg, S. ; Le Sommer, J. ; Masina, S. ; Marsland, S.J. ; Penny, S.G. ; Qiao, F. ; Ringler, T.D. ; Treguier, A.M. ; Tsujino, H. ; Uotila, P. ; Yeager, S.G.
Title
Challenges and Prospects in Ocean Circulation Models
Type
$loc['typeJournal Article']
Year
2019
Publication
Frontiers in Marine Science
Abbreviated Journal
Front. Mar. Sci.
Volume
6
Issue
Pages
Keywords
Southern Ocean ; Overturning Circulation: Regional sea level ; submesoscale ; ice shelves ; turbulence
Abstract
We revisit the challenges and prospects for ocean circulation models following Griffies et al. (2010). Over the past decade, ocean circulation models evolved through improved understanding, numerics, spatial discretization, grid configurations, parameterizations, data assimilation, environmental monitoring, and process-level observations and modeling. Important large scale applications over the last decade are simulations of the Southern Ocean, the Meridional Overturning Circulation and its variability, and regional sea level change. Submesoscale variability is now routinely resolved in process models and permitted in a few global models, and submesoscale effects are parameterized in most global models. The scales where nonhydrostatic effects become important are beginning to be resolved in regional and process models. Coupling to sea ice, ice shelves, and high-resolution atmospheric models has stimulated new ideas and driven improvements in numerics. Observations have provided insight into turbulence and mixing around the globe and its consequences are assessed through perturbed physics models. Relatedly, parameterizations of the mixing and overturning processes in boundary layers and the ocean interior have improved. New diagnostics being used for evaluating models alongside present and novel observations are briefly referenced. The overall goal is summarizing new developments in ocean modeling, including how new and existing observations can be used, what modeling challenges remain, and how simulations can be used to support observations.
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
2296-7745
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ user @
Serial
1011
Permanent link to this record