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Author (up) Thoppil, P.G.; Metzger, E.J.; Hurlburt, H.E.; Smedstad, O.M.; Ichikawa, H.
Title The current system east of the Ryukyu Islands as revealed by a global ocean reanalysis Type $loc['typeJournal Article']
Year 2016 Publication Progress in Oceanography Abbreviated Journal Progress in Oceanography
Volume 141 Issue Pages 239-258
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0079-6611 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 54
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Author (up) Tilburg, C.E.; Hurlburt, H.E.; O'Brien, J.J.; Shriver, J.F.
Title Remote Topographic Forcing of a Baroclinic Western Boundary Current: An Explanation for the Southland Current and the Pathway of the Subtropical Front East of New Zealand* Type $loc['typeJournal Article']
Year 2002 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 32 Issue 11 Pages 3216-3232
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Abstract
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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 492
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Author (up) Tilburg, C.E.; Hurlburt, H.E.; O'Brien, J.J.; Shriver, J.F.
Title The Dynamics of the East Australian Current System: The Tasman Front, the East Auckland Current, and the East Cape Current Type $loc['typeJournal Article']
Year 2001 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 31 Issue 10 Pages 2917-2943
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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 513
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Author (up) Trossman, D.S.; Arbic, B.K.; Straub, D.N.; Richman, J.G.; Chassignet, E.P.; Wallcraft, A.J.; Xu, X.
Title The Role of Rough Topography in Mediating Impacts of Bottom Drag in Eddying Ocean Circulation Models Type $loc['typeJournal Article']
Year 2017 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 47 Issue 8 Pages 1941-1959
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Abstract
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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 230
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Author (up) Xiaobiao Xu, Eric Chassignet
Title Subpolar-Subtropical Connectivity of the North Atlantic Circulation Type $loc['typeMiscellaneous']
Year 2019 Publication PHYSICAL OCEANOGRAPHY Abbreviated Journal
Volume Issue Pages
Keywords Warming, hydrographic, subtropical gyres, sub-basins, passive tracers
Abstract The ocean, through its large capacity to store heat, plays a critical role in Earth's climate and climate variability. Warming of the world's oceans since 1955 accounts for approximately 93% of the warming of the Earth system. However, this warming is neither spatially uniform nor temporally constant. Superimposed on the global long-term trend is climate variability on inter-annual to inter-decadal time scales and regional to basin scales. Satellite altimeters and hydrographic observations show that the North Atlantic, including the sub-polar region, has rapidly become warmer and saltier since the early 1990s. An emerging picture is that the most recent 20 years or so of warming in the North Atlantic represents, in part, a transition of the Atlantic multi-decadal variability pattern from a cold to a warm phase. These decadal climate transitions involve changes both laterally in the sub-tropical and sub-polar gyres of the North Atlantic and vertically in the Atlantic Meridional Overturning Circulation (AMOC), a key component of the global heat and freshwater circulation system. This study of the North Atlantic circulation concentrates on a transition region around the Grand Banks of Newfoundland, where the effects of boundary currents and jets, recirculations, and mesoscale eddies (length scales typically less than 100 km) are dominant. Strong interactions occur in this transition region, laterally between the subpolar and subtropical gyres and vertically between the cold and warm limbs of the Atlantic Meridional Circulation (AMOC). There is evidence that this relatively compact region plays a key role in altering and even modulating the AMOC over a much larger scale and thus is important for the long-term, decadal variability of the Atlantic Ocean. Yet, despite many observational field programs, the dynamics and impacts of this region are not well understood. The project will contribute to understanding the variability of the AMOC by addressing the connectivity of the sub-polar and the sub-tropical gyres. The results of this model-data synthesis will be of particular significance to coupled climate models, which are central to understanding and predicting global climate change. The educational/outreach components of this project will be focused on cultivating scientific literacy with regards to ocean climate research in K-12 schools, at the university level, and in the local community through a variety of online resources/interactive tools for educators, the Florida State University Young Scholars program for high school students, and the “Scientists in the Schools” program. Finally, the requested funding will support a junior faculty member and a graduate student who will be trained in ocean modeling, data analysis and interpretation.

Through ongoing major observation programs in the sub-polar and sub-tropical North Atlantic Ocean, oceanographers are making great strides toward a better understanding of the structure and variability of the AMOC within these sub-basins. The work proposed here complements these observations by focusing on key questions pertaining to what controls the circulation in between and how much the sub-polar to sub-tropical connectivity modulates the larger scale AMOC. This project aims to elucidate the physical dynamics that controls circulation in the transition region, especially the relative importance of the eddies and the deep western boundary current, and document the role and impact of the transition region on the larger scale circulation, especially the variability of the AMOC and water properties in the sub-polar and sub-tropical North Atlantic from inter-annual to decadal and longer time scales. The interaction of eddies and time mean circulations represents one of the greatest challenges to prediction of global climate variability, and it can be studied with the fine-grid resolution model included in this project. These objectives will be met by performing a detailed model-data synthesis study, combining numerical results from a suite of high-resolution Atlantic simulations using the HYbrid Coordinate Ocean Model (HYCOM) and existing observations (satellite altimetry, drifters/floats, hydrography, tracers, and mooring arrays). The three-dimensional Atlantic circulation will be quantified by performing analysis of water mass transport and transformation, passive tracers, and potential vorticity and momentum fluxes. It has been demonstrated that the eddy-resolving HYCOM represents the basic circulation features in the transition region and larger scale North Atlantic Ocean, including both time mean structure and temporal variability.
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Publisher Place of Publication Editor
Language Summary Language Original Title
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Funding Approved $loc['no']
Call Number COAPS @ user @ Serial 1018
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Author (up) Xu, X.; Rhines, P.B.; Chassignet, E.P.
Title On Mapping the Diapycnal Water Mass Transformation of the Upper North Atlantic Ocean Type $loc['typeJournal Article']
Year 2018 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 48 Issue 10 Pages 2233-2258
Keywords Atmosphere-ocean interaction; Boundary currents; Diapycnal mixing; Fronts; Thermocline circulation
Abstract Diapycnal water mass transformation is the essence behind the Atlantic meridional overturning circulation (AMOC) and the associated heat/freshwater transports. Existing studies have mostly focused on the transformation that is forced by surface buoyancy fluxes, and the role of interior mixing is much less known. This study maps the three-dimensional structure of the diapycnal transformation, both surface forced and mixing induced, using results of a high-resolution numerical model that have been shown to represent the large-scale structure of the AMOC and the North Atlantic subpolar/subtropical gyres well. The analyses show that 1) annual mean transformation takes place seamlessly from the subtropical to the subpolar North Atlantic following the surface buoyancy loss along the northward-flowing upper AMOC limb; 2) mixing, including wintertime convection and warm-season restratification by mesoscale eddies in the mixed layer and submixed layer diapycnal mixing, drives transformations of (i) Subtropical Mode Water in the southern part of the subtropical gyre and (ii) Labrador Sea Water in the Labrador Sea and on its southward path in the western Newfoundland Basin; and 3) patterns of diapycnal transformations toward lighter and denser water do not align zonally�the net three-dimensional transformation is significantly stronger than the zonally integrated, two-dimensional AMOC streamfunction (50% in the southern subtropical North Atlantic and 60% in the western subpolar North Atlantic).
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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 951
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Author (up) Xu, X.; Rhines, P.B.; Chassignet, E.P.; Schmitz Jr., W.J.
Title Spreading of Denmark Strait Overflow Water in the Western Subpolar North Atlantic: Insights from Eddy-Resolving Simulations with a Passive Tracer Type $loc['typeJournal Article']
Year 2015 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 45 Issue 12 Pages 2913-2932
Keywords Circulation/ Dynamics; Abyssal circulation; Boundary currents; Ocean circulation; Ocean dynamics; Potential vorticity; Topographic effects
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 116
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Author (up) Yan, Y.; Chassignet, E.P.; Qi, Y.; Dewar, W.K.
Title Freshening of Subsurface Waters in the Northwest Pacific Subtropical Gyre: Observations and Dynamics Type $loc['typeJournal Article']
Year 2013 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 43 Issue 12 Pages 2733-2751
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 0022-3670 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 178
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Author (up) Zavala-Hidalgo, J.; Morey, S.L.; O'Brien, J.J.
Title Cyclonic Eddies Northeast of the Campeche Bank from Altimetry Data Type $loc['typeJournal Article']
Year 2003 Publication Journal of Physical Oceanography Abbreviated Journal J. Phys. Oceanogr.
Volume 33 Issue 3 Pages 623-629
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
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ISSN 0022-3670 ISBN Medium
Area Expedition Conference
Funding ONR, NOAA, NASA Approved $loc['no']
Call Number COAPS @ mfield @ Serial 483
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Author (up) Özgökmen, T.; Chassignet, E.; Dawson, C.; Dukhovskoy, D.; Jacobs, G.; Ledwell, J.; Garcia-Pineda, O.; MadDonald, I.; Morey, S.; Olascoaga, M.; Poje, A.; Reed, M.; Skancke, J.
Title Over What Area Did the Oil and Gas Spread During the 2010 Deepwater Horizon Oil Spill? Type $loc['typeJournal Article']
Year 2016 Publication Oceanography Abbreviated Journal Oceanog
Volume 29 Issue 3 Pages 96-107
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1042-8275 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 87
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