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  • 1
    Online-Ressource
    Online-Ressource
    Influence of the Agulhas Current on Summer Rainfall along the Southeast Coast of South Africa
    American Meteorological Society ; 1993
    In:  Journal of Applied Meteorology Vol. 32, No. 7 ( 1993-07), p. 1282-1287
    Details
    In: Journal of Applied Meteorology, American Meteorological Society, Vol. 32, No. 7 ( 1993-07), p. 1282-1287
    Materialart: Online-Ressource
    ISSN: 0894-8763 , 1520-0450
    URL: Article
    DOI: 10.1175/1520-0450(1993)032〈1282:IOTACO〉2.0.CO;2
    Sprache: Englisch
    Verlag: American Meteorological Society
    Publikationsdatum: 1993
    ZDB Id: 242493-9
    ZDB Id: 2027356-3
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    On the influence of submarine ridges on translation and stability of Agulhas rings
    American Geophysical Union (AGU) ; 1999
    In:  Journal of Geophysical Research: Oceans Vol. 104, No. C4 ( 1999-04-15), p. 7897-7906
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 104, No. C4 ( 1999-04-15), p. 7897-7906
    Kurzfassung: A series of experiments with a quasi‐geostrophic model have been carried out to investigate the influence of topographic obstacles on the translatory movement of Agulhas rings. The rings were initialized as Gaussian‐shaped anomalies in the stream function field of a two‐layer ocean at rest. Bottom topography consisted of a meridional ridge of constant height in the middle of the quadratic model domain. The vertical ring structure, the initial ring position, and the height of the ridge were varied. The general northwestward movement of the model eddies has been shown to be modified toward a more equatorward direction by encountering the upslope of the ridge. Sufficient topographic heights and strong slopes can even block the eddies and force them toward a pure meridional movement. During their translation the eddies lose their vertical coherence. After about 150 days the eddy can only be detected by the surface signal, while the lower layer eddy is dispersed by the radiation of Rossby waves. The passage of “young” (regarding the time between their initialization and their contact with the ridge) and energetic eddies is accompanied by the observation of along‐slope currents of significant strength. These may be due to the rectification of radiated Rossby waves at the topographic slope. Only eddies with a significant dynamic signal in the lower layer are influenced by the bottom topography. Strong, shallow eddies over deep lower layers can cross the ridge without strong modification of their translatory movement.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/1998JC900127
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1999
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
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  • 3
    Online-Ressource
    Online-Ressource
    Natal pulses and the formation of Agulhas rings
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Oceans Vol. 105, No. C3 ( 2000-03-15), p. 6425-6436
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 105, No. C3 ( 2000-03-15), p. 6425-6436
    Kurzfassung: Large solitary meanders form on the Agulhas Current at irregular intervals as it travels along the east coast of South Africa. These so‐called Natal pulses are thought to have a significant effect on the shedding of Agulhas rings downstream at the Agulhas Retroflection and thereby on the exchange of water properties between the Indian and the Atlantic Ocean. Data from the Geosat, ERS 1, and TOPEX/Poseidon satellite altimeters and Advanced Very High Resolution Radiometer (AVHRR) infrared imagery from the Pathfinder project are analyzed and show that this intuitive idea seems to be correct. Close to the coast, individual altimeter tracks are used to identify the cyclonic Natal pulses as depressions in the sea‐surface topography. Using different tracks, the pulses can then be followed from close to Durban to the Agulhas Bank. They show that each shedding of an Agulhas ring is preceded by the appearance of a Natal pulse close to Durban. A significant correlation is found with a time lag of 165 days. Interpolated topography maps are used to follow pulses along the Agulhas Bank to the ring‐shedding area. They indicate that sometimes pulses trigger ring shedding by themselves or by merging with Rossby wave‐like meanders in the Agulhas Return Current. Infrared imagery supports these interpretations.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/1999JC900196
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2000
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
    Online-Ressource
    The source of Benguela Niños in the South Atlantic Ocean : SOURCE OF BENGUELA NIÑOS
    American Geophysical Union (AGU) ; 2003
    In:  Geophysical Research Letters Vol. 30, No. 10 ( 2003-05-15), p. n/a-n/a
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 30, No. 10 ( 2003-05-15), p. n/a-n/a
    Materialart: Online-Ressource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2003GL017172
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2003
    ZDB Id: 2021599-X
    ZDB Id: 7403-2
    SSG: 16,13
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  • 5
    Online-Ressource
    Online-Ressource
    Translation, decay and splitting of Agulhas rings in the southeastern Atlantic Ocean
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Oceans Vol. 105, No. C9 ( 2000-09-15), p. 21913-21925
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 105, No. C9 ( 2000-09-15), p. 21913-21925
    Kurzfassung: All Agulhas rings that were spawned at the Agulhas retroflection between 1993 and 1996 (a total of 21 rings) have been monitored using TOPEX/Poseidon satellite altimetry and followed as they moved through the southeastern Atlantic Ocean, decayed, interacted with bottom topography and each other, or dissipated completely. Rings preferentially crossed the Walvis Ridge at its deepest parts. After having crossed this ridge they have lower translational speeds, and their decay rate decreases markedly. Half the decay of long‐lived rings takes place in the first 5 months of their lifetimes. In addition to the strong decay of rings in the Cape Basin, about one third of the observed rings do not seem to leave this region at all but totally disintegrate here. The interaction of rings with bottom topography, in particular with the Vema Seamount, is shown frequently to cause splitting of rings. This will enhance mixing of the rings' Indian Ocean water into that of the southern Atlantic. This localized mixing may well provide a considerable source of warm and salty Indian Ocean water into the Atlantic overturning circulation.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/1999JC000046
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2000
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
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  • 6
    Online-Ressource
    Online-Ressource
    Direct observations of eddy turbulence at a ridge in the Southern Ocean : EDDY TURBULENCE IN THE SOUTHERN OCEAN
    American Geophysical Union (AGU) ; 2005
    In:  Geophysical Research Letters Vol. 32, No. 14 ( 2005-07-28), p. n/a-n/a
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 32, No. 14 ( 2005-07-28), p. n/a-n/a
    Materialart: Online-Ressource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2005GL022588
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2005
    ZDB Id: 2021599-X
    ZDB Id: 7403-2
    SSG: 16,13
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  • 7
    Online-Ressource
    Online-Ressource
    Observations of the flow in the Mozambique Channel : OBSERVATIONS IN THE MOZAMBIQUE CHANNEL
    American Geophysical Union (AGU) ; 2002
    In:  Geophysical Research Letters Vol. 29, No. 10 ( 2002-05-15), p. 140-1-140-3
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 29, No. 10 ( 2002-05-15), p. 140-1-140-3
    Materialart: Online-Ressource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2001GL013714
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2002
    ZDB Id: 2021599-X
    ZDB Id: 7403-2
    SSG: 16,13
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  • 8
    Online-Ressource
    Online-Ressource
    A Quantitative Assessment of Year-to-Year Variability in Water Movement in the South-west Indian Ocean
    Springer Science and Business Media LLC ; 1972
    In:  Nature Physical Science Vol. 239, No. 91 ( 1972-9), p. 59-61
    Details
    In: Nature Physical Science, Springer Science and Business Media LLC, Vol. 239, No. 91 ( 1972-9), p. 59-61
    Materialart: Online-Ressource
    ISSN: 0300-8746 , 2058-1106
    URL: Article
    DOI: 10.1038/physci239059a0
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 1972
    ZDB Id: 2590711-6
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  • 9
    Online-Ressource
    Online-Ressource
    Generation and Evolution of Natal Pulses: Solitary Meanders in the Agulhas Current
    American Meteorological Society ; 1999
    In:  Journal of Physical Oceanography Vol. 29, No. 12 ( 1999-12), p. 3043-3055
    Details
    In: Journal of Physical Oceanography, American Meteorological Society, Vol. 29, No. 12 ( 1999-12), p. 3043-3055
    Materialart: Online-Ressource
    ISSN: 0022-3670 , 1520-0485
    URL: Article
    DOI: 10.1175/1520-0485(1999)029〈3043:GAEONP〉2.0.CO;2
    Sprache: Englisch
    Verlag: American Meteorological Society
    Publikationsdatum: 1999
    ZDB Id: 2042184-9
    ZDB Id: 184162-2
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  • 10
    Online-Ressource
    Online-Ressource
    Eddy fluxes of heat and salt from the southwest Indian Ocean into the southeast Atlantic Ocean: A case study
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Oceans Vol. 99, No. C7 ( 1994-07-15), p. 14053-14070
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 99, No. C7 ( 1994-07-15), p. 14053-14070
    Kurzfassung: Hydrographic data collected during a dedicated research cruise in the Agulhas Retroflection region in February/March 1987 are analyzed in conjunction with Geosat altimetry from December 1986 to December 1988. Estimates of the heat and salt anomalies of eddies and rings observed in this hydrographic survey, are combined with the altimetric tracking of these features to provide insight into and quantification of the climatically important interbasin exchanges occurring in this region. Over the 2‐year period a total of 14 anticyclonic eddies were generated by the Agulhas Current, approximately 50% of these were observed in the satellite altimetry analysis not to migrate farther than 1500 km west or northwest of the Agulhas Retroflection region. Altimetry data show a number of eddies being shed south of the Agulhas Retroflection; all were observed ultimately to move westward rather than southward across the Subtropical Convergence. The estimated net heat fluxes (300 W m −2 ) and evaporative losses (1 cm day −1 ) to the atmosphere from eddies within the Agulhas Retroflection region in February–March 1987 were appreciably larger than the austral summer climatological means (25 to 100 W m −2 and 0.6 cm day −1 , respectively) for this region. From the combined altimetric and hydrographic analyses, the volume flux of Indian Ocean water warmer than 10°C into the South Atlantic Ocean via the Agulhas eddy field is estimated to be 6.3 Sv (1 Sv = 10 6 m 3 s −1 ) and 7.3 Sv for water warmer than 8°C. Similarly, estimated fluxes of heat and salt into the Atlantic Ocean via the Agulhas eddy field are 0.045 PW and 78×10 12 kg per annum, respectively.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/94JC00383
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1994
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
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