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  • Articles  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 45 (1993), S. 13-14 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 38 (1985), S. 7-22 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Strömungsdaten von 7 Verankerungen, die im nordöstlichen Atlantik über mehrere Jahre ausgelegt waren, wurden im Hinblick auf halbtägige barotrope und barokline sowie eintägige barotrope Gezeiten analysiert. Bei den halbtägigen Tiden M2 und S2 dominiert normalerweise die Energie der barotropen Eigenfunktion, nur in wenigen Fällen enthält die barokline Welle 1. Ordnung höhere Energie. Die Ellipsenorientierungen für die barotropen Komponenten entsprechen früheren Ergebnissen von Tiefseepegeln in diesem Gebiet. Es gibt jedoch signifikante Abweichungen bei den Amplituden. Die Gezeiten in diesem Gebiet sind fast ausschließlich fortschreitende Wellen, in einigen wenigen Fällen jedoch vom gemischten Typ. Die räumliche Änderung der Strömungsellipsen entspricht weitgehend den Ergebnissen, die Cartwright, Edden, Spencer et al. [1980] indirekt aus Pegelbeobachtungen erhielten.
    Abstract: Résumé Les mesures de courants provenant de 7 mouillages sur plusieurs années en Atlantique Nord-Est ont été analysées en ce qui concerne les marées semi-diurnes barotropes et baroclines et les marées diurnes barotropes. Pour les marées semi-diurnes M2 et S2 la répartition de l'énergie est généralement dominée par le mode barotrope; dans peu de cas seulement, le mode barocline de premier ordre renferme la plus haute énergie. Les orientations de l'ellipse relevant de la marée barotrope sont en accord avec les résultats d'observations marégraphiques antérieures dans cette région. Des écarts significatifs apparaissent toutefois en amplitude. Les résultats concernant la composante Ki sont également présentés. A quelques exceptions près, les marées, dans cette région, se sont trouvées être des ondes progressives. Le type d'ellipse des courants est semblable aux résultats obtenus indirectement par Cartwright, Edden, Spencer et al. [1980] à partir des observations marégraphiques.
    Notes: Summary Current data obtained from 7 moorings in the Northeast Atlantic in the course of many years are analysed with respect to semi-diurnal barotropic and baroclinic tides and diurnal barotropic tides. For semi-diurnal tides M2 and S2 the energy distribution is usually dominated by the barotropic mode; only in a few cases does the first-order baroclinic mode contain higher energy. Barotropic tidal ellipse orientations are found to be consistent with results from earlier tide gauge observations in this area. Significant deviations occur, however, in amplitudes. Results for the diurnal component K1 are also presented. With few exceptions, tides are found to be progressive waves in this area. The current ellipse pattern is similar to results obtained indirectly by Cartwright, Edden, Spencer et al. [1980] from tide gauge observations.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 36 (1983), S. 61-77 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary Ever since construction has altered the estuary of the Weser River to make it more navigable, regular water samples were collected at several stations along the river (Fig. 1). Salinities were determined in order to assess possible changes as a consequence of the engineering activities. For almost 100 years the sampling scheme remained unaltered. Today this unique data set (Fig. 3) is of more than local interest. Whereas drastic changes of tidal phenomena are obvious from tidal gauge measurements (Fig. 2), natural fluctuations of salinity hide respective changes of the salinity distribution. We have tried to separate the natural from the man-made fluctuation of salinity using two simple models to eliminate known causes of natural fluctuations. Difficulties encountered were the incompleteness of the data set and the absence of data averaged over cross sections. Nevertheless it was possible to eliminate, approximately, the influence of the catchment area and salinity variations of the adjacent sea. Salinity variations as a consequence of the engineering works depend on the quantity $$K = H^2 /(\bar A \cdot \zeta _0 )$$ , whereH is the depth of a cross-section with area $$\bar A$$ averaged over the tides, and 2 $$\zeta _0 $$ is the tidal elevation. Because of long-term changes of the tides in the North Sea, it was not possible to isolate the influence of the engineering works. Conclusions include consequences for modern sampling strategies to determine trends of water quality.
    Abstract: Résumé Des séries de mesures effectuées depuis une centaine d'années ont permis d'examiner les variations sur une longue période du taux de salinité du cours inférieur de la Weser et leurs causes possibles. Cette étude s'est efforcé de distinguer les effets naturels des effets anthropogènes sur le taux de salinité. Malgré les données incomplètes, l'influence du bassin de drainage et des variations de salinité des zones maritimes limitrophes a pratiquement pu être éliminée. En raison des modifications du régime des marées en Mer du Nord sur une longue période, il n'a pas été possible de formuler des commentaires précis quant à l'impact sur la salinité des travaux de construction entrepris ces 100 dernières années du cours inférieur de la Weser. Les résultats de nos études fournissent des indications utiles pour la mise en place de réseaux modernes de mesure destinés à déterminer la qualité de l'eau.
    Notes: Zusammenfassung Anhand hundertjähriger Meßreihen wurden langfristige Salzgehaltsänderungen in der Unterweser und ihre möglichen Ursachen untersucht. Dabei wurde angestrebt, die natürlichen und die anthropogenen Einflüsse auf den Salzgehalt zu trennen. Trotz des unvollständigen Datensatzes konnten der Einfluß des Einzugsgebietes und Salzgehaltsschwankungen des angrenzenden Meeresgebietes nahezu eliminiert werden. Wegen der langzeitigen Änderungen der Gezeiten in der Nordsee waren genaue Aussagen über die Auswirkung der in den letzten hundert Jahren in der Unterweser durchgeführten Baumaßnahmen auf den Salzgehalt nicht möglich. Unsere Ergebnisse geben Hinweise für moderne Meßnetze zur Bestimmung der Wasserqualität.
    Type of Medium: Electronic Resource
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  • 4
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    PANGAEA
    In:  EPIC3WOCE., Bremerhaven, PANGAEA
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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  • 5
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    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2023-03-16
    Keywords: ANT-IV/1b; Calculated; Course; CT; DATE/TIME; LATITUDE; LONGITUDE; Polarstern; PS08; PS08/1b-track; Speed; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 110 data points
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  • 6
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    PANGAEA
    In:  IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University
    Publication Date: 2023-03-10
    Keywords: Canarias Sea; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Latitude of event; Longitude of event; M6/1; M6/1_798; M6/1_799; M6/1_800; M6/1_802; M6/1_803; M6/1_803-2; M6/1_805; M6/1_807; M6/1_811; M6/1_812; M6/1_812-2; met006_006; Meteor (1986); Pressure, water; Salinity; South Atlantic Ocean; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 167355 data points
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  • 7
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    PANGAEA
    In:  Supplement to: Zenk, Walter; Siedler, Gerold; Ishida, Akio; Holfort, Jürgen; Kashino, Yuji; Kuroda, Yoshifumi; Miyama, Toru; Müller, Thomas J (2005): Pathways and variability of the Antarctic Intermediate Water in the western equatorial Pacific Ocean. Progress in Oceanography, 67(1-2), 245-281, https://doi.org/10.1016/j.pocean.2005.05.003
    Publication Date: 2023-05-12
    Description: In the western equatorial Pacific the low-salinity core of Antarctic Intermediate Water (AAIW) is found at about 800 m depth between potential density levels Sigma-theta = 27.2 and 27.3. The pathways of AAIW and the degradation of its core are studied, from the Bismarck Sea to the Caroline Basins and into the zonal equatorial current system. Both historical and new observational data, and results from numerical circulation model runs are used. The observations include hydrographic stations from German and Japanese research vessels, and Eulerian and Lagrangian current measurements. The model is the JAMSTEC high-resolution numerical model based on the Modular Ocean Model (MOM 2). The general agreement between results from the observations and from the model enables us to diagnose properties and to provide new information on the AAIW. The analysis confirms the paramount influence of topography on the spreading of the AAIW tongue north of New Guinea. Two cores of AAIW are found in the eastern Bismarck Sea. One core originates from Vitiaz Strait and one from St. George's Channel, probably arriving on a cyclonic pathway. They merge in the western Bismarck Sea without much change in their total salt content, and the uniform core then increases considerably in salt content when subjected to mixing in the Caroline Basins. Hydrographic and moored current observations as well as model results show a distinct annual signal in salinity and velocity in the AAIW core off New Guinea. It appears to be related to the monsoonal change that is typically found in the near-surface waters in the region. Lagrangian data are used to investigate the structure of the deep New Guinea Coastal Undercurrent, the related cross-equatorial flow and eddy-structure, and the embedment in the zonal equatorial current system. Results from 17 neutrally buoyant RAFOS floats, ballasted to drift in the AAIW core layer, are compared with a numerical tracking experiment. In the model 73 particles are released at five-day intervals from Station J (2.5°N, 142°E), simulating currents at a moored time series station north of New Guinea. Observed and model track patterns are fairly consistent in space and season. Floats cross the equator preferably north of Cenderawasih Bay, with a maximum range in eddy-motion in this region north of New Guinea. The northward route at 135°E is also reflected in a low-salinity tongue reaching up to 3°N. At that longitude the floats seem to ignore the zonally aligned equatorial undercurrents. Farther to the east (139?145°E), however, the float observations are consistent with low-latitude bands of intermediate currents.
    Keywords: WOCE; World Ocean Circulation Experiment
    Type: Dataset
    Format: application/zip, 14 datasets
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  • 8
    Publication Date: 2023-02-28
    Keywords: Carbon dioxide in the Atlantic Ocean; CARINA; CT; DATE/TIME; Date/Time of event; DEPTH, water; Fugacity of carbon dioxide (air, 100% humidity); Fugacity of carbon dioxide in seawater; LATITUDE; LONGITUDE; NDIR-based seawater-air equilibration technique; Pressure, atmospheric; Salinity; Ship based meteorological sensor; SO113/1; SO113/1-track; Sonne; Temperature, water; Thermosalinograph; TROPAC; TSG; Underway cruise track measurements; Volume fraction of carbon dioxide in dry air; West Pacific; Wind direction; Wind speed
    Type: Dataset
    Format: text/tab-separated-values, 122542 data points
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  • 9
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    PANGAEA
    In:  Supplement to: Meincke, Jens; Siedler, Gerold; Zenk, Walter (1975): Some current near the continental slope off Portugal. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A16, 15-22
    Publication Date: 2023-05-12
    Description: Some current meter data obtained from a mooring at 2450 m water depth near the continental slope off Portugal are presented. The mean currents at five levels with observations are northward. Mean speeds in the core of the Mediterranean Water exceed speeds at shallower levels by 2 to 3 cm/sec, indicating advection connected to this specific water mass. The current variability is dominated by semi-diurnal tidal components. Normal mode analysis reveals a predominant mode of order 2, representing 48% of the total kinetic tidal energy. Results for the barotropic tidal component are in good agreement with earlier predictions for this area. The motion at higher frequencies w in the internal gravity wave band can be well described by a w**-2 power law for the energy density spectrum. This result is consistent with earlier observations in other parts of the ocean.
    Keywords: Atlantische Kuppenfahrten 1967/1-3; M8; M8_026; Meteor (1964); MOOR; Mooring; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
    Publication Date: 2024-02-03
    Keywords: Atlantische Kuppenfahrten 1967/1-3; Current direction; Current velocity, horizontal; Date/time end; Date/time start; DEPTH, water; GIK/IfG; Institute for Geosciences, Christian Albrechts University, Kiel; M8; M8_026; Meteor (1964); MOOR; Mooring; Sample code/label; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 160 data points
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