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  • AGU (American Geophysical Union)  (14)
  • Kiel : Inst. für Meereskunde, Abt. Meeresphysik  (4)
  • Technische Universität Clausthal Arbeitsgruppe Meerestechnik und Marine Mineralrohstoffe  (3)
  • Hamburg : Leitstelle Meteor, Inst. für Meereskunde der Univ. Hamburg  (2)
  • Marine Technology Society  (2)
Document type
Keywords
Publisher
Language
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  • 11
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    On the Origin of the Azores Current (1989)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 94 (C5). pp. 6159-6168.
    Details
    Publication Date: 2017-09-26
    Description: The Azores Current, south of the Azores Archipelago, is part of the subtropical North Atlantic gyre. Using an international hydrographic data set, we analyze mean and seasonal geostrophic transport fields in the upper 800 m of the ocean in order to determine the origin of the Azores Current in the western basin and seasonal changes in the related flow. Geostrophic currents are obtained by using the method applied by Stramma (1984) in the eastern basin. The Azores Current is found to originate in the area of the Southwest Newfoundland Rise (Figure 10). In winter an almost uniform current connects this region of origin with the Azores Current, while a branching into two current bands is observed in summer, with the southern band forming a marked cyclonic loop. Within the upper 800 m, all of the transport in the northern band and about 70% of the transport in the southern band recirculates in the eastern basin. Additionally, expendable bathythermograph data from the Azores Current region indicate an increase of eddy potential energy from winter to summer.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/JC094iC05p06159
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 12
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    Barotropic and Baroclinic Tidal Currents in the Eastern Basins of the North Atlantic (1991)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 96 (C12). pp. 22259-22271.
    Details
    Publication Date: 2017-09-26
    Description: Data from a large-scale moored array in the Iberian and Canary basins are used to determine the energies of barotropic and baroclinic M2 and S2 tides. An analysis of time-varying dynamical modes is performed. The results for barotropic modes confirm the global surface tide model results of Schwiderski (1980) for this region. The barotropic modes dominate in the deep basins, but increased baroclinic contributions are usually found over rough topography. At three locations near the continental slope in the southern Canary Basin the baroclinic modes dominate the barotropic mode. Results from an array of three moorings at the northern part of the Cape Verde Rise show an inverse behavior of barotropic and baroclinic energies, such that the baroclinic energy is steadily enhanced while the barotropic energy is reduced towards the continental margin. The increase in baroclinic energy is consistent with a generation of internal tides close to the shelf by surface tidal forcing over topography. Further evidence for this process is provided by the 2-week periodicity of the first-order baroclinic mode at the slope, corresponding to the spring-neap cycle of the barotropic tide.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/91JC02319
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 13
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    Energy conversion in the Cape Verde Frontal Zone (1998)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 103 (C10). 21,469-21,479.
    Details
    Publication Date: 2018-04-30
    Description: 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.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/98JC01887
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 14
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    Mooring systems used in the Eastern Atlantic (1967)
    Marine Technology Society
    In:  Transactions of the International Buoy Technology Symposium, 1967 . pp. 77-83.
    Details
    Publication Date: 2017-06-26
    Type: Article , NonPeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - without review
  • 15
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    Path of the North Atlantic Deep Water in the Brazil Basin (1998)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 103 (C3). pp. 5419-5428.
    Details
    Publication Date: 2018-04-30
    Description: Recent hydrographic sections and high-quality historical data sets are used to determine geostrophic currents at subtropical latitudes in the western basin of the South Atlantic. Levels of no motion are determined from water mass information and a mass balance constraint to obtain the transport field of North Atlantic Deep Water (NADW) in this region. The incoming NADW transport of about 20 Sv from the north at 19 degrees S appears to be balanced by only one third of this transport leaving in the south and two thirds leaving to the east or northeast at the Mid-Atlantic Ridge. A simple model is proposed to determine the cause of the NADW branching. It is shown that potential vorticity preservation in the presence of topographic changes leads to a similar flow pattern as observed, with branching near the Vitoria-Trindade-Ridge and also an eastward turning of the southward western boundary current at about 28 degrees S, the latitude where a balance of planetary vorticity change and stretching can be expected.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/97JC03287
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 16
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    On the Variability of Southern Ocean Front Locations Between Southern Brazil and the Antarctic Peninsula (1989)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 94 (C4). pp. 4757-4762.
    Details
    Publication Date: 2019-02-27
    Description: A 4-year expendable bathythermograph data set (1984–1987) from the area between southern Brazil and the Antarctic Peninsula provides information on the interannual variability of front locations. Two boundaries of subtropical water at different depths are identified north and south of the Brazil Current-Falkland (Malvinas) Current confluence zone. The northern Subtropical Front is displaced over a large part of the Argentine Basin from one observational period to the other. The shallow southern Subtropical Front appears fixed to the Falkland Escarpment. The Polar Front and Subantarctic Front locations do not vary much, except for one case where a cold core eddy in the Polar Frontal Zone causes a large northward displacement of the Subantarctic Front.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/JC094iC04p04757
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 17
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    An anchored vertically moving instrument and its application as parameter follower (1964)
    Marine Technology Society
    In:  Transactions of the International Buoy Technology Symposium, 1964 . pp. 483-488.
    Details
    Publication Date: 2016-05-24
    Type: Article , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 18
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    Physikalische Eigenschaften des Meerwassers (1971)
    Technische Universität Clausthal Arbeitsgruppe Meerestechnik und Marine Mineralrohstoffe
    In:  Beiträge zur Meerestechnik, 1 . pp. 1-22.
    Details
    Publication Date: 2016-09-06
    Type: Article , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 19
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    Physikalische Messmethoden II (1971)
    Technische Universität Clausthal Arbeitsgruppe Meerestechnik und Marine Mineralrohstoffe
    In:  Beiträge zur Meerestechnik, 1 . pp. 219-239.
    Details
    Publication Date: 2016-09-06
    Type: Article , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 20
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    Gezeiten (1971)
    Technische Universität Clausthal Arbeitsgruppe Meerestechnik und Marine Mineralrohstoffe
    In:  Beiträge zur Meerestechnik, 1 . pp. 123-138.
    Details
    Publication Date: 2016-09-06
    Type: Article , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
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