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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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    Springer
    In:  Deutsche Hydrographische Zeitschrift, 38 (1). pp. 7-22.
    Publication Date: 2016-11-02
    Description: 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: Article , PeerReviewed
    Format: text
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  • 5
    Publication Date: 2019-01-21
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Germany, pp. 83-104. ISBN 3-540-62079-6
    Publication Date: 2019-09-03
    Description: The data from six zonal sections in the World Ocean Circulation Experiment (WOCE) in the tropical and southem Atlantic are used to describe the distribution of water masses. Due to the high spatial resolution, the structure oftemperature, salinity, oxygen, silicate and nitrate displays details related to transport and mixing in this region. Temperature-salinity diagrams are also presented which indicate the effects ofbranching and recirculation loops in the water mass flow.
    Type: Book chapter , PeerReviewed
    Format: text
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  • 7
    facet.materialart.
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    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Germany, pp. 355-361.
    Publication Date: 2013-01-15
    Type: Book chapter , NonPeerReviewed
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  • 8
    facet.materialart.
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    Springer
    In:  In: Landolt-Börnstein Zahlenwerte und Funktionen aus Naturwissenschaften und Technik: Neue Serie = Numerical data and functional relationships in science and technology: new series / Ed.-in-chief: O. Madelung Gruppe 5, Geophysik und Weltraumforschung = Geophysics and space research Bd. 3, Ozeanographie = Oceanography, Teilband a. Springer, Berlin, Germany, pp. 233-264. ISBN 3-540-15092-7
    Publication Date: 2020-03-05
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 9
    facet.materialart.
    Unknown
    Springer
    In:  Deutsche Hydrographische Zeitschrift, 36 (2). pp. 61-77.
    Publication Date: 2016-11-02
    Description: 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: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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  • 10
    facet.materialart.
    Unknown
    Springer
    In:  In: The South Atlantic: Present and Past Circulation. , ed. by Wefer, G., Berger, W. H., Siedler, G. and Webb, D. J. Springer, Berlin, Heidelberg, pp. 105-120. ISBN 3-540-62079-6
    Publication Date: 2020-04-03
    Description: Hydrographic data along 11°S occupied in 1983 by the R.V. OCEANUS are used together with various wind climatologies to estimate the annual average transport of heat at this latitude. Some motivation for expecting fairly well-defined estimates at this latitude compared to others comes from the absence of a strong western boundary current. Results include flow in four layers representing the thermocline, Antarctic Intermediate Water, North Atlantic Deep Water, and Antarctic Bottom Water, using zero velocity reference level choices based on property distributions. The annual average heat transport is estimated to be 0.6 ± 0.17 x 1015 W. Previous estimates of the transport at 8–16°S range from 0.2 PW to greater than 1 PW. Interannual variability from the wind field alone leads to interannual heat transport variability of about 0.05 PW. Comparisons with other recent studies at 45–30°S and 11°N are made.
    Type: Book chapter , NonPeerReviewed
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