Records
Author
Ajayi, A. ; Le Sommer, J. ; Chassignet, E. ; Molines, J.-M. ; Xu, X. ; Albert, A. ; Cosme, E.
Title
Spatial and Temporal Variability of the North Atlantic Eddy Field From Two Kilometric-Resolution Ocean Models
Type
$loc['typeJournal Article']
Year
2020
Publication
Journal of Geophysical Research: Oceans
Abbreviated Journal
J. Geophys. Res. Oceans
Volume
125
Issue
5
Pages
Keywords
submesoscales ; fine‐ ; scales ; enstrophy ; eddies ; SWOT
Abstract
Ocean circulation is dominated by turbulent geostrophic eddy fields with typical scales ranging from 10 to 300 km. At mesoscales (>50 km), the size of eddy structures varies regionally following the Rossby radius of deformation. The variability of the scale of smaller eddies is not well known due to the limitations in existing numerical simulations and satellite capability. Nevertheless, it is well established that oceanic flows (<50 km) generally exhibit strong seasonality. In this study, we present a basin‐scale analysis of coherent structures down to 10 km in the North Atlantic Ocean using two submesoscale‐permitting ocean models, a NEMO‐based North Atlantic simulation with a horizontal resolution of 1/60 (NATL60) and an HYCOM‐based Atlantic simulation with a horizontal resolution of 1/50 (HYCOM50). We investigate the spatial and temporal variability of the scale of eddy structures with a particular focus on eddies with scales of 10 to 100 km, and examine the impact of the seasonality of submesoscale energy on the seasonality and distribution of coherent structures in the North Atlantic. Our results show an overall good agreement between the two models in terms of surface wave number spectra and seasonal variability. The key findings of the paper are that (i) the mean size of ocean eddies show strong seasonality; (ii) this seasonality is associated with an increased population of submesoscale eddies (10�50 km) in winter; and (iii) the net release of available potential energy associated with mixed layer instability is responsible for the emergence of the increased population of submesoscale eddies in wintertime.
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
1104
Permanent link to this record
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
Arruda, W. ; Zharkov, V. ; Deremble, B. ; Nof, D. ; Chassignet, E.
Title
A New Model of Current Retroflection Applied to the Westward Protrusion of the Agulhas Current
Type
$loc['typeJournal Article']
Year
2014
Publication
Journal of Physical Oceanography
Abbreviated Journal
J. Phys. Oceanogr.
Volume
44
Issue
12
Pages
3118-3138
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
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Series Volume
Series Issue
Edition
ISSN
0022-3670
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
122
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
Brassington, G.B. ; Martin, M.J. ; Tolman, H.L. ; Akella, S. ; Balmeseda, M. ; Chambers, C.R.S. ; Chassignet, E. ; Cummings, J.A. ; Drillet, Y. ; Jansen, P.A.E.M. ; Laloyaux, P. ; Lea, D. ; Mehra, A. ; Mirouze, I. ; Ritchie, H. ; Samson, G. ; Sandery, P.A. ; Smith, G.C. ; Suarez, M. ; Todling, R.
Title
Progress and challenges in short- to medium-range coupled prediction
Type
$loc['typeJournal Article']
Year
2015
Publication
Journal of Operational Oceanography
Abbreviated Journal
Journal of Operational Oceanography
Volume
8
Issue
sup2
Pages
s239-s258
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
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Summary Language
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Series Editor
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Series Volume
Series Issue
Edition
ISSN
1755-876X
ISBN
Medium
Area
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Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
96
Permanent link to this record
Author
Chassignet, E. ; Cenedese, E. ; Verron, J.
Title
Buoyancy-Drivenn Flows
Type
$loc['typeBook Whole']
Year
2012
Publication
Abbreviated Journal
Volume
Issue
Pages
Keywords
Abstract
Address
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Thesis
Publisher
Cambridge University Press
Place of Publication
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Summary Language
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Series Editor
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ISBN
Medium
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Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
264
Permanent link to this record
Author
Chassignet, E. ; Hurlburt, H. ; Metzger, E.J. ; Smedstad, O. ; Cummings, J. ; Halliwell, G. ; Bleck, R. ; Baraille, R. ; Wallcraft, A. ; Lozano, C. ; Tolman, H. ; Srinivasan, A. ; Hankin, S. ; Cornillon, P. ; Weisberg, R. ; Barth, A. ; He, R. ; Werner, F. ; Wilkin, J.
Title
US GODAE: Global Ocean Prediction with the HYbrid Coordinate Ocean Model (HYCOM)
Type
$loc['typeJournal Article']
Year
2009
Publication
Oceanography
Abbreviated Journal
Oceanog.
Volume
22
Issue
2
Pages
64-75
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
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Series Volume
Series Issue
Edition
ISSN
1042-8275
ISBN
Medium
Area
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Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
390
Permanent link to this record
Author
Chassignet, E. P. ; Marshall, D. P.
Title
Gulf Stream Separation in Numerical Ocean Models
Type
$loc['typeBook Chapter']
Year
2008
Publication
Ocean Modeling in an Eddying Regime
Abbreviated Journal
Volume
Issue
Pages
Keywords
Abstract
Address
Corporate Author
Thesis
Publisher
American Geophysical Union
Place of Publication
Washington, DC
Editor
Hecht, M. W.; Hasumi, H.
Language
Summary Language
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Series Editor
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ISSN
ISBN
Medium
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Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
695
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