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Author
LaCasce, J.H. ; Escartin, J. ; Chassignet, E.P. ; Xu, X.
Title
Jet instability over smooth, corrugated and realistic bathymetry
Type
$loc['typeJournal Article']
Year
2018
Publication
Journal of Physical Oceanography
Abbreviated Journal
J. Phys. Oceanogr.
Volume
Issue
Pages
Keywords
Abstract
The stability of a horizontally- and vertically-sheared surface jet is examined, with a focus on the vertical structure of the resultant eddies. Over a flat bottom, the instability is mixed baroclinic/barotropic, producing strong eddies at depth which are characteristically shifted downstream relative to the surface eddies. Baroclinic instability is suppressed over a large slope for retrograde jets (with a flow anti-parallel to topographic wave propagation), and to a lesser extent for prograde jets (with flow parallel to topographic wave propagation), as seen previously. In such cases, barotropic (lateral) instability dominates if the jet is sufficiently narrow. This yields surface eddies whose size is independent of the slope but proportional to the jet width. Deep eddies still form, forced by interfacial motion associated with the surface eddies, but they are weaker than under baroclinic instability and are vertically aligned with the surface eddies. A sinusoidal ridge acts similarly, suppressing baroclinic instability and favoring lateral instability in the upper layer. A ridge with a 1 km wavelength and an amplitude of roughly 10 m is sufficient to suppress baroclinic instability. Surveys of bottom roughness from bathymetry acquired with shipboard multibeam echosounding reveal that such heights are common, beneath the Kuroshio, the Antarctic Circumpolar Current and, to a lesser extent, the Gulf Stream. Consistent with this, vorticity and velocity cross sections from a 1/50° HYCOM simulation suggest that Gulf Stream eddies are vertically aligned, as in the linear stability calculations with strong topography. Thus lateral instability may be more common than previously thought, due to topography hindering vertical energy transfer.
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 @ user @
Serial
998
Permanent link to this record
Author
Robinson, W. ; Speich, S. ; Chassignet, E.
Title
Exploring the Interplay Between Ocean Eddies and the Atmosphere
Type
$loc['typeJournal Article']
Year
2018
Publication
Eos
Abbreviated Journal
Eos
Volume
99
Issue
Pages
Keywords
Mesoscale ; Climate ; Variability ; Atmospheric
Abstract
Climate models, for the first time, have sufficient resolution to capture mesoscale ocean eddies and their interactions with the atmosphere.New model results suggest that the atmosphere, at weather scales or larger, responds to cumulative effects of the much smaller ocean eddies. Intriguing new model results presented at the workshop suggested that the atmosphere, at weather scales or larger.
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Corporate Author
Thesis
Publisher
Place of Publication
Editor
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Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
2324-9250
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ rl18 @
Serial
988
Permanent link to this record
Author
Xu, X. ; Chassignet, E.P., Wang, F.
Title
On the variability of the Atlantic meridional overturning circulation transports in coupled CMIP5 simulations
Type
$loc['typeJournal Article']
Year
2018
Publication
Climate Dynamics
Abbreviated Journal
Clim Dyn.
Volume
51
Issue
11
Pages
6511-6531
Keywords
NAO-AMOC ; CMIP5 ; NAO index ; AMOC index ; meridional pressure gradient ; magnitude ; structure change of the NAO.
Abstract
The Atlantic meridional overturning circulation (AMOC) plays a fundamental role in the climate system, and long-term climate simulations are used to understand the AMOC variability and to assess its impact. This study examines the basic characteristics of the AMOC variability in 44 CMIP5 (Phase 5 of the Coupled Model Inter-comparison Project) simulations, using the 18 atmospherically-forced CORE-II (Phase 2 of the Coordinated Ocean-ice Reference Experiment) simulations as a reference. The analysis shows that on interannual and decadal timescales, the AMOC variability in the CMIP5 exhibits a similar magnitude and meridional coherence as in the CORE-II simulations, indicating that the modeled atmospheric variability responsible for AMOC variability in the CMIP5 is in reasonable agreement with the CORE-II forcing. On multidecadal timescales, however, the AMOC variability is weaker by a factor of more than 2 and meridionally less coherent in the CMIP5 than in the CORE-II simulations. The CMIP5 simulations also exhibit a weaker long-term atmospheric variability in the North Atlantic Oscillation (NAO). However, one cannot fully attribute the weaker AMOC variability to the weaker variability in NAO because, unlike the CORE-II simulations, the CMIP5 simulations do not exhibit a robust NAO-AMOC linkage. While the variability of the wintertime heat flux and mixed layer depth in the western subpolar North Atlantic is strongly linked to the AMOC variability, the NAO variability is not.
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ISSN
ISBN
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Approved
$loc['no']
Call Number
COAPS @ rl18 @
Serial
981
Permanent link to this record
Author
Xu, X. ; Bower, A. ; Furey, H. ; Chassignet, E.P.
Title
Variability of the Iceland-Scotland Overflow Water Transport Through the Charlie-Gibbs Fracture Zone: Results From an Eddying Simulation and Observations
Type
$loc['typeJournal Article']
Year
2018
Publication
Journal of Geophysical Research: Oceans
Abbreviated Journal
J. Geophys. Res. Oceans
Volume
Issue
8
Pages
Keywords
Abstract
Observations show that the westward transport of the Iceland‐Scotland overflow water (ISOW) through the Charlie‐Gibbs Fracture Zone (CGFZ) is highly variable. This study examines (a) where this variability comes from and (b) how it is related to the variability of ISOW transport at upstream locations in the Iceland Basin and other ISOW flow pathways. The analyses are based on a 35‐year 1/12° eddying Atlantic simulation that represents well the main features of the observed ISOW in the area of interest, in particular, the transport variability through the CGFZ. The results show that (a) the variability of the ISOW transport is closely correlated with that of the barotropic transports in the CGFZ associated with the meridional displacement of the North Atlantic Current front and is possibly induced by fluctuations of large‐scale zonal wind stress in the Western European Basin east of the CGFZ; (b) the variability of the ISOW transport is increased by a factor of 3 from the northern part of the Iceland Basin to the CGFZ region and transport time series at these two locations are not correlated, further suggesting that the variability at the CGFZ does not come from the upstream source; and (c) the variability of the ISOW transport at the CGFZ is strongly anticorrelated to that of the southward ISOW transport along the eastern flank of the Mid‐Atlantic Ridge, suggesting an out‐of‐phase covarying transport between these two ISOW pathways.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
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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
1023
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
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
1755-876X
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
96
Permanent link to this record
Author
Wu, Z. ; Chassignet, E.P. ; Ji, F. ; Huang, J.
Title
Reply to 'Spatiotemporal patterns of warming'
Type
$loc['typeJournal Article']
Year
2014
Publication
Nature Climate Change
Abbreviated Journal
Nature Climate change
Volume
4
Issue
10
Pages
846-848
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
1758-678X
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
151
Permanent link to this record
Author
Ji, F. ; Wu, Z. ; Huang, J. ; Chassignet, E.P.
Title
Evolution of land surface air temperature trend
Type
$loc['typeJournal Article']
Year
2014
Publication
Nature Climate Change
Abbreviated Journal
Nature Climate change
Volume
4
Issue
6
Pages
462-466
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
1758-678X
ISBN
Medium
Area
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Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
131
Permanent link to this record
Author
Jones, C.S. ; Cenedese, C. ; Chassignet, E.P. ; Linden, P. F. ; Sutherland, B.R.
Title
Gravity current propagation up a valley
Type
$loc['typeJournal Article']
Year
2015
Publication
Journal of Fluid Mechanics
Abbreviated Journal
J. Fluid Mech.
Volume
762
Issue
Pages
417-434
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
0022-1120
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
104
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
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Summary Language
Original Title
Series Editor
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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
Nof, D. ; Zharkov, V. ; Ortiz, J. ; Paldor, N. ; Arruda, W. ; Chassignet, E.
Title
The arrested Agulhas retroflection
Type
$loc['typeJournal Article']
Year
2011
Publication
Journal of Marine Research
Abbreviated Journal
J Mar Res
Volume
69
Issue
4
Pages
659-691
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
0022-2402
ISBN
Medium
Area
Expedition
Conference
Funding
Approved
$loc['no']
Call Number
COAPS @ mfield @
Serial
301
Permanent link to this record