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  • 1
    Online Resource
    Online Resource
    Eddy-induced meridional heat transport in the ocean
    American Geophysical Union (AGU) ; 2008
    In:  Geophysical Research Letters Vol. 35, No. 20 ( 2008-10-16)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 35, No. 20 ( 2008-10-16)
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2008GL035490
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Mechanisms of Interannual Variations of the Meridional Overturning Circulation of the North Atlantic Ocean
    American Meteorological Society ; 2008
    In:  Journal of Physical Oceanography Vol. 38, No. 2 ( 2008-02-01), p. 467-480
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 38, No. 2 ( 2008-02-01), p. 467-480
    Abstract: The authors investigate the nature of the interannual variability of the meridional overturning circulation (MOC) of the North Atlantic Ocean using an Estimating the Circulation and Climate of the Ocean (ECCO) assimilation product for the period of 1993–2003. The time series of the first empirical orthogonal function of the MOC is found to be correlated with the North Atlantic Oscillation (NAO) index, while the associated circulation anomalies correspond to cells extending over the full ocean depth. Model sensitivity experiments suggest that the wind is responsible for most of this interannual variability, at least south of 40°N. A dynamical decomposition of the meridional streamfunction allows a further look into the mechanisms. In particular, the contributions associated with 1) the Ekman flow and its depth-independent compensation, 2) the vertical shear flow, and 3) the barotropic gyre flowing over zonally varying topography are examined. Ekman processes are found to dominate the shorter time scales (1.5–3 yr), while for longer time scales (3–10 yr) the MOC variations associated with vertical shear flow are of greater importance. The latter is primarily caused by heaving of the pycnocline in the western subtropics associated with the stronger wind forcing. Finally, how these changes in the MOC affect the meridional heat transport (MHT) is examined. It is found that overall, Ekman processes explain a larger part of interannual variability (3–10 yr) for MHT (57%) than for the MOC (33%).
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/2007JPO3726.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2008
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  • 3
    Online Resource
    Online Resource
    Carl Wunsch Special Issue
    American Meteorological Society ; 2007
    In:  Journal of Physical Oceanography Vol. 37, No. 2 ( 2007-02-01), p. 133-134
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 37, No. 2 ( 2007-02-01), p. 133-134
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/JPO9030.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2007
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  • 4
    Online Resource
    Online Resource
    Interaction of Mesoscale Variability with Large-Scale Waves in the Argentine Basin
    American Meteorological Society ; 2007
    In:  Journal of Physical Oceanography Vol. 37, No. 3 ( 2007-03-01), p. 787-793
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 37, No. 3 ( 2007-03-01), p. 787-793
    Abstract: The Argentine Basin of the South Atlantic Ocean is a region of complicated ocean dynamics involving a wide range of spatial and temporal scales. Previous studies reported the existence of a basin mode of topographic barotropic Rossby waves with a period close to 25 days in the region. Using observations of sea level anomalies from satellite altimeter measurements, the present study provides evidence of interaction between the large-scale 25-day waves and the energetic mesoscale variability of the region. The amplitude of the 25-day waves is highly intermittent with dominant periods in the range of 110–150 days. Within this period band, the wave amplitude is coherent with the energy level of the mesoscale variability: when the mesoscale energy level goes down, the wave amplitude goes up, and vice versa, suggesting an exchange of energy between the two scales. This coherence is linked to the first three empirical orthogonal functions (EOFs) of the sea level anomalies. The spatial patterns of these EOFs are characterized by eddies and meanders associated with the Brazil–Malvinas Confluence. The findings of the study suggest a mechanism of energy exchange at work between the mesoscale variability and the large-scale waves in the Argentine Basin.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/JPO2991.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2007
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  • 5
    Online Resource
    Online Resource
    Pathways of eddies in the South Atlantic Ocean revealed from satellite altimeter observations
    American Geophysical Union (AGU) ; 2006
    In:  Geophysical Research Letters Vol. 33, No. 14 ( 2006)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 33, No. 14 ( 2006)
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2006GL026245
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2006
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    The role of vorticity fluxes in the dynamics of the Zapiola Anticyclone
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113, No. C11 ( 2008-11-18)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113, No. C11 ( 2008-11-18)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2008JC004841
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Wunsch receives 2006 William Bowie medal
    American Geophysical Union (AGU) ; 2007
    In:  Eos, Transactions American Geophysical Union Vol. 88, No. 2 ( 2007-01-09), p. 16-16
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 88, No. 2 ( 2007-01-09), p. 16-16
    Abstract: Carl Wunsch was awarded the 2006 William Bowie Medal at the AGU Fall Meeting Honors Ceremony, which was held on 13 December 2006, in San Francisco, Calif. The medal recognizes outstanding contributions to fundamental geophysics and for unselfish cooperation in research. Carl Wunsch is a visionary in the study of the ocean and its roles in climate change. Through the impact of research, vision, leadership, and unselfish cooperation, he has shaped the landscape of modern oceanography.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2007EO020005
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2007
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    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Impact of Atmospheric Intraseasonal Oscillations on the Indian Ocean Dipole during the 1990s*
    American Meteorological Society ; 2006
    In:  Journal of Physical Oceanography Vol. 36, No. 4 ( 2006-04-01), p. 670-690
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 36, No. 4 ( 2006-04-01), p. 670-690
    Abstract: Effects of atmospheric intraseasonal oscillations (ISOs) on the Indian Ocean zonal dipole mode (IOZDM) are investigated by analyzing available observations and a suite of solutions to an ocean general circulation model, namely, the Hybrid Coordinate Ocean Model (HYCOM). Data and model solutions for the period 1991–2000 are analyzed, a period that includes two strong IOZDM events, during 1994 and 1997, and a weak one, in 1991. Both the data analysis and model results suggest that atmospheric ISOs play a significant role in causing irregularity of the two strong IOZDM events and the premature termination of the weak one. Of particular interest is a basinwide, wind-driven oceanic resonance with a period near 90 days, involving the propagation of equatorial Kelvin and first-meridional-mode Rossby waves across the basin. Before the onset of the strong 1997 dipole, wind variability had significant power near 90 days, and the resonance was strongly excited. Associated with the resonance was a deepened thermocline in the eastern basin during August and early September, which reduced the upwelling in the eastern antinode region of the IOZDM, thereby delaying the reversal of the equatorial zonal SST gradient—an important indicator of a strong IOZDM—by over a month. A similar deepened thermocline in the eastern basin also contributed to the premature termination of the weak 1991 dipole. During the 1994 IOZDM, the winds had little power near 90 days, and the resonant mode was not prominent. The ISOs influenced the IOZDM through both surface fluxes and thermocline variability. They enhanced warming in the western antinode region during October, the peak phase of the IOZDM, intensifying its strength. During November, strong winds significantly cooled the western and central basin through upwelling and surface fluxes, cooling SST there and contributing to the early and quick termination of the 1994 event.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/JPO2892.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2006
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    detail.hit.zdb_id: 184162-2
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  • 9
    Online Resource
    Online Resource
    The 25-Day-Period Large-Scale Oscillations in the Argentine Basin Revisited
    American Meteorological Society ; 2005
    In:  Journal of Physical Oceanography Vol. 35, No. 8 ( 2005-08-01), p. 1473-1479
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 35, No. 8 ( 2005-08-01), p. 1473-1479
    Abstract: From sea surface height measurements made by the Ocean Topography Experiment (TOPEX)/Poseidon satellite, Fu et al. found and described large-scale oscillations at the period of 25 days in the Argentine Basin of the South Atlantic Ocean. These oscillations were previously hinted at by in situ observations. Only the extensive space–time sampling capability of TOPEX/Poseidon, however, was able to give a complete description of the phenomenon as a counterclockwise-rotating dipole centered at 45°S, 317°E over the Zapiola Rise. Fu et al. also undertook theoretical and numerical studies to suggest that the phenomenon is a resonantly excited barotropic normal mode of the locally closed f/H contour. In a simulation study, however, they also found that the space–time smoothing scheme employed would probably lower the amplitude of the estimated phenomenon by 30%–40%. By reprocessing the data using a different method and showing the amplitude to be almost 2 times as large, in this note it is confirmed that this is indeed the case. The original 5-yr study has also been extended to nearly 10 yr, demonstrating that the same phenomenon has persisted for almost 10 yr.
    Type of Medium: Online Resource
    ISSN: 1520-0485 , 0022-3670
    URL: Article
    DOI: 10.1175/JPO2766.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2005
    detail.hit.zdb_id: 2042184-9
    detail.hit.zdb_id: 184162-2
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  • 10
    Online Resource
    Online Resource
    Editorial
    Springer Science and Business Media LLC ; 2006
    In:  Ocean Dynamics Vol. 56, No. 5-6 ( 2006-12-3), p. 377-378
    Details
    In: Ocean Dynamics, Springer Science and Business Media LLC, Vol. 56, No. 5-6 ( 2006-12-3), p. 377-378
    Type of Medium: Online Resource
    ISSN: 1616-7341 , 1616-7228
    URL: Article
    DOI: 10.1007/s10236-006-0090-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2006
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    detail.hit.zdb_id: 201122-0
    SSG: 14
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