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  • 2005-2009  (8)
  • 2009  (8)
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  • 2005-2009  (8)
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  • 1
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    The Agulhas system as a key region of the global oceanic circulation (2009)
    IFM-GEOMAR
    In:  IFM-GEOMAR Annual Report, 2008 . pp. 12-13.
    Details
    Publication Date: 2018-10-16
    Description: The Agulhas system transports warm and salty waters from the Indian to the Atlantic Ocean and therefore acts as a key element in the global oceanic circulation. Studies have shown that mesoscale processes are not only important for the correct description of the circulation around South Africa itself but also for its impact on the Gulf Stream system in the North Atlantic.
    Type: Article , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 2
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    On the connection between Benguela Ninos and Equatorial Atlantic Ninos (2009)
    In:  [Talk] In: Tropical Atlantic Variability Meeting, 04.02.2009, Toulouse, France .
    Details
    Publication Date: 2014-03-11
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 3
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    Agulhas Leakage: The Neglected Player in the Variability of the Atlantic Meridional Overturning Circulation (2009)
    In:  [Talk] In: Seminar Institute for Marine and Atmospheric research Utrecht (IMAU), 26.10, Utrecht, Netherlands .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 4
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    The Agulhas System as a Prime Example for the Use of Nesting Capabilities in Ocean Modelling (2009)
    Springer
    In:  In: High Performance Computing on Vector Systems 2009. , ed. by Resch, M., Roller, S., Benkert, K., Galle, M., Bez, W. and Kobayashi, H. Springer, Berlin, pp. 191-198. ISBN 978-3642039126
    Details
    Publication Date: 2012-07-05
    Type: Book chapter , PeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Book chapter
  • 5
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    Interior pathways of the North Atlantic meridional overturning circulation (2009)
    Nature Publishing Group
    In:  Nature, 459 . pp. 243-248.
    Details
    Publication Date: 2017-03-06
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/nature07979
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    On the spreading of South Atlantic water into the northern Hemisphere (2009)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 114 . C05019.
    Details
    Publication Date: 2018-04-25
    Description: The upper branch of the meridional overturning circulation in the North Atlantic is fed by cross‐equatorial transport of various water masses from the Southern Hemisphere. Here, we study the large‐scale spreading of South Atlantic Water (SAW) into the western tropical North Atlantic from the equator to 25°N. The fractions of SAW in the upper ocean water masses are quantified using a water mass analysis applied on a data set of conductivity‐temperature‐depth data from the Hydrobase project and the Argo float program. To fill gaps in the data coverage and to gain insight into the mechanisms involved, the observations are complemented with results from the high‐resolution Family of Linked Atlantic Model Experiments model (equation image°), which has been shown to realistically simulate the inflow of SAW into the Caribbean. The analysis reveals the mean SAW propagation pathways in the North Atlantic and identifies the regions of largest variability. High SAW fractions in the thermocline and central water layers are limited to the region south of 10°N, where the water body consists of 80%–90% SAW. Thus, the zonal currents in the equatorial gyre are mainly formed of SAW. The weaker currents in the intermediate layer combined with a northward excursion of the North Equatorial Current allow the SAW in this layer to intrude farther north compared to the layers above. The transition into North Atlantic Water occurs gradually from 12°N to 20°N in the intermediate layer.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2008JC005165
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Increase in Agulhas leakage due to poleward shift of Southern Hemisphere westerlies (2009)
    Nature Publishing Group
    In:  Nature, 462 . pp. 495-498.
    Details
    Publication Date: 2019-09-23
    Description: The transport of warm and salty Indian Ocean waters into the Atlantic Ocean—the Agulhas leakage—has a crucial role in the global oceanic circulation1 and thus the evolution of future climate. At present these waters provide the main source of heat and salt for the surface branch of the Atlantic meridional overturning circulation (MOC)2. There is evidence from past glacial-to-interglacial variations in foraminiferal assemblages3 and model studies4 that the amount of Agulhas leakage and its corresponding effect on the MOC has been subject to substantial change, potentially linked to latitudinal shifts in the Southern Hemisphere westerlies5. A progressive poleward migration of the westerlies has been observed during the past two to three decades and linked to anthropogenic forcing6, but because of the sparse observational records it has not been possible to determine whether there has been a concomitant response of Agulhas leakage. Here we present the results of a high-resolution ocean general circulation model7, 8 to show that the transport of Indian Ocean waters into the South Atlantic via the Agulhas leakage has increased during the past decades in response to the change in wind forcing. The increased leakage has contributed to the observed salinification9 of South Atlantic thermocline waters. Both model and historic measurements off South America suggest that the additional Indian Ocean waters have begun to invade the North Atlantic, with potential implications for the future evolution of the MOC.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/nature08519
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Coordinated Ocean-ice Reference Experiments (COREs) (2009)
    Elsevier
    In:  Ocean Modelling, 26 . pp. 1-46.
    Details
    Publication Date: 2019-09-23
    Description: Coordinated Ocean-ice Reference Experiments (COREs) are presented as a tool to explore the behaviour of global ocean-ice models under forcing from a common atmospheric dataset. We highlight issues arising when designing coupled global ocean and sea ice experiments, such as difficulties formulating a consistent forcing methodology and experimental protocol. Particular focus is given to the hydrological forcing, the details of which are key to realizing simulations with stable meridional overturning circulations. The atmospheric forcing from [Large, W., Yeager, S., 2004. Diurnal to decadal global forcing for ocean and sea-ice models: the data sets and flux climatologies. NCAR Technical Note: NCAR/TN-460+STR. CGD Division of the National Center for Atmospheric Research] was developed for coupled-ocean and sea ice models. We found it to be suitable for our purposes, even though its evaluation originally focussed more on the ocean than on the sea-ice. Simulations with this atmospheric forcing are presented from seven global ocean-ice models using the CORE-I design (repeating annual cycle of atmospheric forcing for 500 years). These simulations test the hypothesis that global ocean-ice models run under the same atmospheric state produce qualitatively similar simulations. The validity of this hypothesis is shown to depend on the chosen diagnostic. The CORE simulations provide feedback to the fidelity of the atmospheric forcing and model configuration, with identification of biases promoting avenues for forcing dataset and/or model development.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.ocemod.2008.08.007
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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