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  • AGU (American Geophysical Union)  (2)
  • 2005-2009  (2)
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  • 1
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    Decadal variability of subpolar gyre transport and its reveberation in the North Atlantic overturning. (2006)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 33 (L21S01).
    Details
    Publication Date: 2018-02-19
    Description: Analyses of sea surface height (SSH) records based on satellite altimeter data and hydrographic properties have suggested a considerable weakening of the North Atlantic subpolar gyre during the 1990s. Here we report hindcast simulations with high-resolution ocean circulation models that demonstrate a close correspondence of the SSH changes with the volume transport of the boundary current system in the Labrador Sea. The 1990s-decline, of about 15% of the long-term mean, appears as part of a decadal variability of the gyre transport driven by changes in both heat flux and wind stress associated with the North Atlantic Oscillation (NAO). The changes in the subpolar gyre, as manifested in the deep western boundary current off Labrador, reverberate in the strength of the meridional overturning circulation (MOC) in the subtropical North Atlantic, suggesting the potential of a subpolar transport index as an element of a MOC monitoring system.
    Type: Article , PeerReviewed
    DOI: 10.1029/2006GL026906
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Mesoscale perturbations control inter-ocean exchange south of Africa (2008)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 35 (L20602).
    Details
    Publication Date: 2017-11-08
    Description: The quantification of inter-ocean leakage from the South Indian to the South Atlantic Ocean is an important measure for the role of the Agulhas system in the global thermohaline circulation. To explore the specific role of mesoscale variability (such as Agulhas rings and Mozambique eddies) in this process a high-resolution model (based on NEMO-ORCA) for the Agulhas region has been set up. It is nested into a global coarse-resolution model. The high-resolution nest captures all salient features of the greater Agulhas region, including the upstream perturbations of the Agulhas Current and Natal Pulses along the African coast. A comparison of the inter-ocean exchange in the high-resolution nest with its coarse resolution counterpart reveals that the latter significantly over-estimates the amount of water flowing into the Atlantic Ocean, demonstrating the need to explicitly simulate the mesoscale features. A sensitivity experiment that excludes the upstream perturbations revealed no difference in the amount of inter-ocean exchange. However, the realistic representation of Agulhas rings and their drift path into the South Atlantic depends on the simulation of those upstream perturbations.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: image
    Format: video
    DOI: 10.1029/2008GL035132
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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