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  • Elsevier  (5)
  • Kiel : Inst. für Meereskunde  (3)
  • Pergamon Press  (3)
  • Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel  (2)
  • 1
    Online Resource
    Online Resource
    BMBF-Verbundvorhaben "RACE - Beobachtungen, Simulation und Synthese (multi-)dekadischer Schwankungen der Atlantikzirkulation" : Abschlussbericht der Teilprojekte am GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel : TP 1.1 Die Rolle des tropischen Atlantiks für Klimaschwankungen im atlantischen Raum, TP 1.4 Mechanismen für Zirkulationsschwankungen im Nordatlantik in gekoppelten Ozean-Atmosphäre Modellen, TP 2.2 Die veränderliche Ozeanzirkulation am Westrand des subpolaren Nordatlantiks, TP 3.1 Veränderungen der atlantischen Zirkulationssysteme in hochauflösenden Ozeanmodellen: Ursachen und regionale Auswirkungen (2016)
    Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (31 Seiten, 8,99 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb16/875667473.pdf
    URL: https://doi.org/10.2314/GBV:875667473
    DOI: 10.2314/GBV:875667473
    Language: German
    Note: Förderkennzeichen BMBF 03F065B. - Verbund-Nummer 01071018 , "Autor(en): Biastoch, Arne; Böning, Claus; Brandt, Peter; Dengler, Marcus; Fischer, Jürgen; Karstensen, Johannes; Latif, Mojib, Visbeck, Martin" - Berichtsblatt , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Mit deutscher und englischer Zusammenfassung
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  • 2
    Online Resource
    Online Resource
    North Atlantic Summer 1983 : NOA '83 (2017)
    Kiel : Inst. für Meereskunde
    Details Availability
    Type of Medium: Online Resource
    Pages: Online-Ressource (99 Seiten, 3,3 MB) , Diagramme
    Series Statement: SEA ROVER : data report / Institut für Meereskunde (IfM), Christian-Albrechts-Universität, Kiel 2
    URL: https://oceanrep.geomar.de/22458/
    URL: http://dx.doi.org/10.3289/IFM_BER_175
    DOI: 10.3289/IFM_BER_175
    Language: English
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  • 3
    Online Resource
    Online Resource
    BMBF-Verbundvorhaben "MIKLIP" : Abschlussbericht des Teilprojekt OCEANOBS am GEOMAR : verification of ensembles and initialization fields for decadal climate predictions via ocean observation systems (2016)
    Kiel : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
    Details Availability
    Keywords: Forschungsbericht ; Klima ; Modell ; Meeresströmung
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (15 Seiten, 1,65 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb17/892789085.pdf
    URL: https://doi.org/10.2314/GBV:892789085
    DOI: 10.2314/GBV:892789085
    Language: German
    Note: Förderkennzeichen BMBF 01LP1114A , Autoren und durchführende Institution dem Berichtsblatt entnommen , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Mit deutscher und englischer Zusammenfassung
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  • 4
    Online Resource
    Online Resource
    Struktur und Dynamik einer mesoskaligen Front im Wirbelfeld des nordatlantischen Stromes : = Structure and dynamics of a mesoscale front in the eddy field of the north Atlantic current (1987)
    Kiel : Inst. für Meereskunde
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressoursce (188 Seiten, 5 MB) , Diagramme
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 164
    URL: https://oceanrep.geomar.de/22124/
    URL: http://dx.doi.org/10.3289/ifm_ber_164
    DOI: 10.3289/ifm_ber_164
    Language: German
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 5
    Online Resource
    Online Resource
    North Atlantic Summer 1981 : NOA '81 (2017)
    Kiel : Inst. für Meereskunde
    Details Availability
    Type of Medium: Online Resource
    Pages: Online-Ressource (159 Seiten, 4 MB) , Diagramme
    Series Statement: SEA ROVER : data report / Institut für Meereskunde (IfM), Christian-Albrechts-Universität, Kiel 1
    URL: https://oceanrep.geomar.de/21472/
    URL: http://dx.doi.org/10.3289/ifm_ber_143
    DOI: 10.3289/ifm_ber_143
    Language: English
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  • 6
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    Intra-seasonal variability of the DWBC in the western subpolar North Atlantic (2015)
    Elsevier
    In:  Progress in Oceanography, 132 . pp. 233-249.
    Details
    Publication Date: 2017-04-13
    Description: Highlights: • A joint analysis of deep current meter records in the western North Atlantic. • Intra-seasonal variability dominates the deep boundary current. • Topographic waves near 10d periods trapped over steep topography. • Basin centers are showing longer periods (50d) caused by the eddy field. • Observed variability characteristics compared to high resolution model simulation. Abstract The Deep Western Boundary Current (DWBC) along the western margin of the subpolar North Atlantic is an important component of the deep limb of the Meridional Overturning near its northern origins. A network of moored arrays from Denmark Strait to the tail of the Grand Banks has been installed for almost two decades to observe the boundary currents and transports of North Atlantic Deep Water as part of an internationally coordinated observatory for the Atlantic Meridional Overturning Circulation. The dominant variability in all of the moored velocity time series is in the week-to-month period range. While the temporal characteristics of this variability change only gradually between Denmark Strait and Flemish Cap, a broad band of longer term variability is present farther along the path of the DWBC at the Grand Banks and in the interior basins (Labrador and Irminger Seas). The vigorous intra-seasonal variability may well mask possible interannual to decadal variability that is typically an order of magnitude smaller than the high-frequency fluctuations. Here, the intra-seasonal variability is quantified at key positions along the DWBC path using both, observations and high resolution model data. The results are used to evaluate the model circulation, and in turn the model is used to relate the discrete measurements to the overall pattern of the subpolar circulation. Topographic waves are found to be trapped by the steep topography all around the western basins, the Labrador and Irminger Seas. In the Labrador Sea, the high intra-seasonal variability of the boundary current regime is separated by a region of extremely low variability in narrow recirculation cells from the basin interior. There, the variability is also on intra-seasonal timescales, but at much longer periods around 50 days.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    DOI: 10.1016/j.pocean.2014.04.002
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    The North Brazil Undercurrent (1995)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 42 (5). pp. 773-795.
    Details
    Publication Date: 2018-03-02
    Description: The flow field in the area of what was thought to be the source region of the North Brazil Current (NBC) off the northeast coast of Brazil between 5 degrees 30'S and 10 degrees S was investigated in austral spring during November 1992 and compared with observations in October 1990. The data were taken with several different instruments, including vessel-mounted ADCP, lowered-ADCP, Pegasus, CTD and XBTs. The flow was found off the coast at 5 degrees 30'S as well as at 10 degrees S as an undercurrent, the North Brazil Undercurrent (NBUC). The NBUC shows a subsurface core at about 200 m depth with velocities of up to 90.0 cm s(-1), resulting in large northward transports of more than 22 Sv in the upper 1000 m. The transport is about the same at 5 degrees 30'S and 10 degrees S, hence no net inflow from the east is required to feed the NBUC. The climatological Ekman transport is to the south between 5 degrees 30'S and 10 degrees S, and in consequence the northward flow near the surface was reduced and might be one reason for the existence of the undercurrent. The flow near the coast was to the north at 10 degrees S, therefore the Brazil Current had to start as a coastal current south of 10 degrees S. For the zonal sections at 5 degrees 30'S and 10 degrees S the geostrophic computations relative to the density surface sigma(1) = 32.15 kg m(-3) (about 1150 m depth) resulted in transports comparable to those obtained from direct measurements. The results further show that the choice of a correct level of no motion can be supported by the direct observations. A shallower reference based on water mass boundaries alone would reduce the NBUC transport to almost zero. Computations with data from the historical data base for austral fall resulted in a weaker NBUC of less than 20 Sv near 10 degrees S, indicating a possible seasonal signal in the NBUC with a stronger NBUC in austral spring.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0637(95)00014-W
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Winter and summer monsoon water mass, heat and freshwater transport changes in the Arabian Sea near 8°N (2002)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 49 . pp. 1173-1195.
    Details
    Publication Date: 2020-08-05
    Description: The differences in the water mass distributions and transports in the Arabian Sea between the summer monsoon of August 1993 and the winter monsoon of January 1998 are investigated, based on two hydrographic sections along approximately 8°N. At the western end the sections were closed by a northward leg towards the African continent at about 55°E. In the central basin along 8°N the monsoon anomalies of the temperature and density below the surface-mixed layer were dominated by annual Rossby waves propagating westward across the Arabian Sea. In the northwestern part of the basin the annual Rossby waves have much smaller impact, and the density anomalies observed there were mostly associated with the Socotra Gyre. Salinity and oxygen differences along the section reflect local processes such as the spreading of water masses originating in the Bay of Bengal, northward transport of Indian Central Water, or slightly stronger southward spreading of Red Sea Water in August than in January. The anomalous wind conditions of 1997/98 influenced only the upper 50–100 m with warmer surface waters in January 1998, and Bay of Bengal Water covered the surface layer of the section in the eastern Arabian Sea. Estimates of the overturning circulation of the Arabian Sea were carried out despite the fact that many uncertainties are involved. For both cruises a vertical overturning cell of about 4–6 Sv was determined, with inflow below 2500 m and outflow between about 300 and 2500 m. In the upper 300–450 m a seasonally reversing shallow meridional overturning cell appears to exist in which the Ekman transport is balanced by a geostrophic transport. The heat flux across 8°N is dominated by the Ekman transport, yielding about –0.6 PW for August 1993, and 0.24 PW for January 1998. These values are comparable to climatological and model derived heat flux estimates. Freshwater fluxes across 8°N also were computed, yielding northward freshwater fluxes of 0.07 Sv in January 1998 and 0.43 Sv in August 1993. From climatological salinities the stronger freshwater flux in August was found to be caused by the seasonal change of salinity storage in the Arabian Sea north of 8°N. The near-surface circulation follows complex pathways, with generally cyclonic-circulation in January 1998 affected at the eastern side by the Laccadive High, and anticyclonic circulation in August 1993.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(01)00169-2
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  • 9
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    Circulation, variability and near equatorial meridional flow in the central tropical Atlantic (2003)
    Elsevier
    In:  In: Interhemispheric Water Exchange in the Atlantic Ocean. , ed. by Goni, G. and Malanotte-Rizzoli, P. Elsevier Oceanography Series, 68 . Elsevier, Amsterdam, Netherlands, pp. 1-22.
    Details
    Publication Date: 2019-08-16
    Description: Observations in the central tropical Atlantic are used to investigate the circulation, the variability, and the near-equatorial meridional flow in this oceanic region. Meridional sections confirm that the southern band of the South Equatorial Current is a broad sluggish flow transporting subtropical water northwestward toward the western boundary. Variability in the South Equatorial Current is weak with an annual signal of about 2 cm/s. Recent equatorial flow observations agree with the previously proposed mean flow field, indicating that a permanent tropical circulation exists that is composed of several zonal current and countercurrent bands of small vertical and meridional extent compared to the subtropical gyres. However, wave phenomena superimpose on the mean flow field. On seasonal time scales the variability in the zonal flow field near the equator is dominated by the semiannual cycle in the central and eastern part while the annual cycle dominates in the western part. This seasonal variability is caused by the propagation of equatorial Rossby and Kelvin waves generated mainly by the zonal wind anomaly at the equator. Despite the observations of instantaneous cross-equatorial velocities and of floats crossing the equator it remains unclear whether there is a net cross-equatorial flow in the central tropical Atlantic in addition to cross-equatorial exchanges via thermocline convergence, upwelling and Ekman divergence. Three floats deployed at 200 m and 400 m depth either leave their deployment region at the equator to join the North Equatorial Undercurrent and progress further northward or in two cases have been deployed in the southern hemisphere and drift towards the equator.
    Type: Book chapter , PeerReviewed
    Format: text
    DOI: 10.1016/S0422-9894(03)80141-1
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    OceanRep: Book chapter
  • 10
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    Seasonal variation of the daily zooplankton migration in the Greenland sea (1993)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 40 (8). pp. 1547-1557.
    Details
    Publication Date: 2016-10-19
    Description: Moored Acoustic Doppler Current Profilers (ADCPs) were used to analyse the daily vertical zooplankton migration and its seasonality. One-year records of vertical velocity and acoustic backscatter were obtained at four stations in the Greenland Sea. Both parameters exhibited a diurnal cycle typical for vertically migrating zooplankton. Upward and downward migration occured in short periods approximately 5 h long, and peak migration velocities were around 1.5 cm s−1. Similar structures were observed at all four mooring sites in the 200–300 m depth range. Farther down, between 1000 and 1400 m, no daily migration was observed. Strong seasonal variations are evident, and both the phase and intensity of the migration pattern change with daylight as the season progresses. In summer and during the polar night the migration became very weak and was only detectable in the displacement of scattering layers. When the day/ night contrast was large, intense upward or downward motion was accompanied by sloping backscatter isopleths. We observed two main scattering layers, a deep layer that varies in depth with season and an almost invariable shallow scattering layer at about 150 m depth. The deep layer was interpreted as the “resting depth” of the migrating plankter, and the latter as their “feeding horizon”. Changes in the “resting depth” from about 400 m in autumn and spring to about 200 m in winter lead to seasonal variations in the migration distance. This behaviour is discussed with respect to environmental conditions.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0967-0637(93)90015-U
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