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  • American Geophysical Union (AGU)  (6)
  • 1
    Online-Ressource
    Online-Ressource
    Seasonal changes in the tropical Atlantic circulation: Observation and simulation of the Guinea Dome
    American Geophysical Union (AGU) ; 1992
    In:  Journal of Geophysical Research: Oceans Vol. 97, No. C1 ( 1992-01-15), p. 703-715
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 97, No. C1 ( 1992-01-15), p. 703-715
    Kurzfassung: The Guinea Dome is a permanent, quasi‐stationary feature on the eastern side of the thermal ridge extending zonally across the tropical North Atlantic. The dome is a part of the large‐scale near‐surface flow fields associated with the North Equatorial Current, the North Equatorial Countercurrent and the North Equatorial Undercurrent. In the present study, historical and recently obtained hydrographic data are combined to investigate the thermohaline structure and geostrophic flow field in the vicinity of the dome. It is shown that the Guinea Dome exists throughout the year both in subthermocline and thermocline layers, that it has a corresponding cyclonic geostrophic flow, and that seasonal changes occur with respect to its vertical structure, horizontal extent, and position. The observational results are then compared with simulations from a general circulation model of the tropical Atlantic. A seven‐year simulation forced by observed monthly winds is run to compute a monthly climatology. The model adequately simulates the Guinea Dome with respect to its structure, flow field, and seasonal variability.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JC02501
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1992
    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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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Data-driven simulations of synoptic circulation and transports in the Tunisia-Sardinia-Sicily region
    American Geophysical Union (AGU) ; 2003
    In:  Journal of Geophysical Research Vol. 108, No. C9 ( 2003)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 108, No. C9 ( 2003)
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2002JC001348
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2003
    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
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Double diffusion in the Mediterranean Sea: Observation and parameterization of salt finger convection
    American Geophysical Union (AGU) ; 2003
    In:  Journal of Geophysical Research Vol. 108, No. C9 ( 2003)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 108, No. C9 ( 2003)
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2002JC001349
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2003
    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
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Energy conversion in the Cape Verde Frontal Zone
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Oceans Vol. 103, No. C10 ( 1998-09-15), p. 21469-21479
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 103, No. C10 ( 1998-09-15), p. 21469-21479
    Kurzfassung: Mechanical energy terms are calculated from moored current meter data in the Cape Verde Frontal Zone (about 20°N, 25°W) and compared with those derived from a mesoscale model of this frontal region. The model is of the Bleck and Boudra [1981] type with isopycnal coordinates. An initially zonal jet, representing the Canary Current, is allowed to develop under the influence of baroclinic and barotropic instability processes. We find reasonable agreement in magnitudes, somewhat smaller in the model, and similar distributions in the vertical. This leads to the conclusion that the energy transfer terms from the model can be expected to be sufficiently close to reality. Determination of the transfer terms confirms that the energy transfer in the zone is dominated by baroclinic instability processes while barotropic instability is of minor importance. Average baroclinic instability energy transfer terms reach values of 2–3 μW m −3 in the pycnocline. Peak layer mean values are of the order 10 μW m −3 . It is shown that the spatial distribution of active transfer regions is closely related to the structure of the transient eddy field in the frontal zone and that strong instability processes are restricted to the pycnocline.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JC01887
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1998
    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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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Multiscale Observations of Deep Convection in the Northwestern Mediterranean Sea During Winter 2012–2013 Using Multiple Platforms
    American Geophysical Union (AGU) ; 2018
    In:  Journal of Geophysical Research: Oceans Vol. 123, No. 3 ( 2018-03), p. 1745-1776
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 123, No. 3 ( 2018-03), p. 1745-1776
    Kurzfassung: We study deep convection and subsequent bloom in the northwestern Mediterranean Sea based on modern observation techniques We provide estimates of mass and energy fluxes over a period of a year in the deep convection area and deep water formation rates We highlight small‐scale circulation features that are important for deep convection and subsequent bloom and introduce this special issue
    Materialart: Online-Ressource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrc.v123.3
    DOI: 10.1002/2016JC012671
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2018
    ZDB Id: 2016804-4
    ZDB Id: 161667-5
    ZDB Id: 3094219-6
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Seasonal variability of flow instabilities in the Strait of Sicily
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Oceans Vol. 103, No. C11 ( 1998-10-15), p. 24799-24820
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 103, No. C11 ( 1998-10-15), p. 24799-24820
    Kurzfassung: The eastern and western Mediterranean Seas are connected by the Strait of Sicily. The mean flow conditions comprise a near‐surface flow of Atlantic Water (AW) into the eastern Mediterranean and an outflow of Levantine Intermediate Water (LIW) below. We present results of a numerical model investigating the stability of currents in the Strait. The model is nonlinear and uses a hybrid (quasi‐isopycnic) vertical coordinate. The model domain is a periodic channel with horizontal dimensions of 400 × 200 km and different bathymetries. As initial conditions, we use seasonal climatological density fields varying only in cross‐channel direction. External forcing is not applied. Combining three different bathymetries with both summer and winter climatological data, we show the results of six model integrations. In all cases the flow is baroclinically unstable, the most unstable waves being 100 and 133 km wavelength in summer and 67 km in winter. A cross‐channel parabolic bottom profile instead of a flat bottom stabilizes the flow in the north (on the Sicilian side of the Strait) but causes further destabilization in the south (on the African side). Further modification of the bathymetry in terms of shallow shelf sea areas to the south of Sicily leads to a deflection of the summer flow in both the AW and the LIW range and to the generation of stationary eddies. In agreement with observations the final kinetic and eddy kinetic energies of the model are higher in winter than in summer in all model runs. From an inspection of satellite images, evidence was found for unstable waves of similar wavelength as predicted by the model. Records from moored current meters support enhanced flow instability on the African side of the Strait. The position and circulation sense of the stationary eddies in the AW range are found to be consistent with climatology and previously known patches of low sea surface temperature.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JC00891
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1998
    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
    BibTip Andere fanden auch interessant ...
    Online-Ressource
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