Records |
Author |
Deremble, B.; Dewar, W.K.; Chassignet, E.P. |
Title |
Vorticity dynamics near sharp topographic features |
Type |
$loc['typeJournal Article'] |
Year |
2016 |
Publication |
Journal of Marine Research |
Abbreviated Journal |
J Mar Res |
Volume |
74 |
Issue |
6 |
Pages |
249-276 |
Keywords |
vorticity conservation; point vortex; vortex sheet; singularities |
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0022-2402 |
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$loc['no'] |
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COAPS @ mfield @ |
Serial |
231 |
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Author |
Jones, C.S.; Cenedese, C.; Chassignet, E.P.; Linden, P. F.; Sutherland, B.R. |
Title |
Gravity current propagation up a valley |
Type |
$loc['typeJournal Article'] |
Year |
2015 |
Publication |
Journal of Fluid Mechanics |
Abbreviated Journal |
J. Fluid Mech. |
Volume |
762 |
Issue |
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Pages |
417-434 |
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0022-1120 |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
104 |
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Author |
Ji, F.; Wu, Z.; Huang, J.; Chassignet, E.P. |
Title |
Evolution of land surface air temperature trend |
Type |
$loc['typeJournal Article'] |
Year |
2014 |
Publication |
Nature Climate Change |
Abbreviated Journal |
Nature Climate change |
Volume |
4 |
Issue |
6 |
Pages |
462-466 |
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1758-678X |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
131 |
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Author |
Wu, Z.; Chassignet, E.P.; Ji, F.; Huang, J. |
Title |
Reply to 'Spatiotemporal patterns of warming' |
Type |
$loc['typeJournal Article'] |
Year |
2014 |
Publication |
Nature Climate Change |
Abbreviated Journal |
Nature Climate change |
Volume |
4 |
Issue |
10 |
Pages |
846-848 |
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1758-678X |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
151 |
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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 |
$loc['typeJournal Article'] |
Year |
2015 |
Publication |
Journal of Operational Oceanography |
Abbreviated Journal |
Journal of Operational Oceanography |
Volume |
8 |
Issue |
sup2 |
Pages |
s239-s258 |
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1755-876X |
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$loc['no'] |
Call Number |
COAPS @ mfield @ |
Serial |
96 |
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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 |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Journal of Geophysical Research: Oceans |
Abbreviated Journal |
J. Geophys. Res. Oceans |
Volume |
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Issue |
8 |
Pages |
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Abstract |
Observations show that the westward transport of the Iceland‐Scotland overflow water (ISOW) through the Charlie‐Gibbs Fracture Zone (CGFZ) is highly variable. This study examines (a) where this variability comes from and (b) how it is related to the variability of ISOW transport at upstream locations in the Iceland Basin and other ISOW flow pathways. The analyses are based on a 35‐year 1/12° eddying Atlantic simulation that represents well the main features of the observed ISOW in the area of interest, in particular, the transport variability through the CGFZ. The results show that (a) the variability of the ISOW transport is closely correlated with that of the barotropic transports in the CGFZ associated with the meridional displacement of the North Atlantic Current front and is possibly induced by fluctuations of large‐scale zonal wind stress in the Western European Basin east of the CGFZ; (b) the variability of the ISOW transport is increased by a factor of 3 from the northern part of the Iceland Basin to the CGFZ region and transport time series at these two locations are not correlated, further suggesting that the variability at the CGFZ does not come from the upstream source; and (c) the variability of the ISOW transport at the CGFZ is strongly anticorrelated to that of the southward ISOW transport along the eastern flank of the Mid‐Atlantic Ridge, suggesting an out‐of‐phase covarying transport between these two ISOW pathways. |
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ISSN |
2169-9275 |
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$loc['no'] |
Call Number |
COAPS @ user @ |
Serial |
1023 |
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Author |
Xu, X.; Chassignet, E.P., Wang, F. |
Title |
On the variability of the Atlantic meridional overturning circulation transports in coupled CMIP5 simulations |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Climate Dynamics |
Abbreviated Journal |
Clim Dyn. |
Volume |
51 |
Issue |
11 |
Pages |
6511-6531 |
Keywords |
NAO-AMOC; CMIP5; NAO index; AMOC index; meridional pressure gradient; magnitude; structure change of the NAO. |
Abstract |
The Atlantic meridional overturning circulation (AMOC) plays a fundamental role in the climate system, and long-term climate simulations are used to understand the AMOC variability and to assess its impact. This study examines the basic characteristics of the AMOC variability in 44 CMIP5 (Phase 5 of the Coupled Model Inter-comparison Project) simulations, using the 18 atmospherically-forced CORE-II (Phase 2 of the Coordinated Ocean-ice Reference Experiment) simulations as a reference. The analysis shows that on interannual and decadal timescales, the AMOC variability in the CMIP5 exhibits a similar magnitude and meridional coherence as in the CORE-II simulations, indicating that the modeled atmospheric variability responsible for AMOC variability in the CMIP5 is in reasonable agreement with the CORE-II forcing. On multidecadal timescales, however, the AMOC variability is weaker by a factor of more than 2 and meridionally less coherent in the CMIP5 than in the CORE-II simulations. The CMIP5 simulations also exhibit a weaker long-term atmospheric variability in the North Atlantic Oscillation (NAO). However, one cannot fully attribute the weaker AMOC variability to the weaker variability in NAO because, unlike the CORE-II simulations, the CMIP5 simulations do not exhibit a robust NAO-AMOC linkage. While the variability of the wintertime heat flux and mixed layer depth in the western subpolar North Atlantic is strongly linked to the AMOC variability, the NAO variability is not. |
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$loc['no'] |
Call Number |
COAPS @ rl18 @ |
Serial |
981 |
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Author |
Robinson, W.; Speich, S.; Chassignet, E. |
Title |
Exploring the Interplay Between Ocean Eddies and the Atmosphere |
Type |
$loc['typeJournal Article'] |
Year |
2018 |
Publication |
Eos |
Abbreviated Journal |
Eos |
Volume |
99 |
Issue |
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Pages |
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Keywords |
Mesoscale; Climate; Variability; Atmospheric |
Abstract |
Climate models, for the first time, have sufficient resolution to capture mesoscale ocean eddies and their interactions with the atmosphere.New model results suggest that the atmosphere, at weather scales or larger, responds to cumulative effects of the much smaller ocean eddies. Intriguing new model results presented at the workshop suggested that the atmosphere, at weather scales or larger. |
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2324-9250 |
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$loc['no'] |
Call Number |
COAPS @ rl18 @ |
Serial |
988 |
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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. |
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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. |
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0022-3670 |
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$loc['no'] |
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COAPS @ user @ |
Serial |
998 |
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Author |
Vinayachandran, P. N.; Davidson, Fraser; Chassignet, E. P. |
Title |
Towards joint assessments, modern capabilities and new links for ocean prediction systems |
Type |
$loc['typeJournal Article'] |
Year |
2020 |
Publication |
Bulletin of the American Meteorological Society |
Abbreviated Journal |
Bull. Amer. Meteor. Soc. |
Volume |
101 |
Issue |
4 |
Pages |
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Abstract |
Approximately 260 individuals from forecasting centers, research laboratories, academia, and industry representing 40 countries met to discuss recent developments in operational oceanography and brainstorm about the future directions of ocean prediction services. |
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$loc['no'] |
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COAPS @ user @ |
Serial |
1091 |
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