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  • 2015-2019  (2)
  • 1985-1989  (2)
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  • 1
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Die mit zwei landgestützten Radarstationen (im Dekameterbereich) gemessenen Oberflächenströmungen werden dargestellt. Das Experiment in der Lübecker Bucht (westliche Ostsee) dauerte vom 14. bis 23. April 1983. Karten der zweidimensionalen Strömungen liegen alle 2 Stunden vor. Die Diskussion der Datenverarbeitung konzentriert sich auf eine Methode, die die Bestimmung horizontaler Ableitungen zuläßt. Es werden sowohl Karten der Strömungsvektoren als auch Zeitserien gezeigt, die mit Daten von Strommessern aus verschiedenen Tiefen verglichen werden. Das Verhältnis von Strömungs- zu Windgeschwindigkeit wird für die beiden horizontalen Komponenten an verschiedenen Orten des Meßgebietes berechnet. Divergenz und Rotation werden als Zeitserien dargestellt, und es werden die Beträge der linearen (lokalen) und nichtlinearen (advektiven) Beschleunigung verglichen.
    Abstract: Résumé Les résultats de mesures de courants par 2 stations radar (haute fréquence) installées à terre sont présentés. L'expérimentation fut menée dans la Lübecker Bucht (ouest de la Baltique) du 14 au 23 avril 1983. Des champs 2D de courants furent établis toutes les 2 heures. La discussion sur le traitement des données se concentre sur une méthode permettant la détermination des dérives horizontales. Les cartes de vitesses de courants mesurées à l'aide des radars présentées sous forme de séries temporelles (time séries) sont comparées avec des mesures de courants par courantomètres obtenues à différentes profondeurs. Le rapport courant/vitesse du vent est déterminé en différents points de la zone de mesure pour les deux composantes horizontales. Des séries temporelles donnant la divergence et le rotationnel sont présentées et on donne également une comparaison entre les accélérations linéaires et non linéaires.
    Notes: Summary Surface currents, as measured by two land-based HF (high frequency) radar stations, are presented. The experiment was performed in the Lübecker Bucht (western Baltic Sea) from April 14 to 23, 1983. Maps of two-dimensional currents were obtained every 2 h. The data processing is discussed with emphasis to a method allowing the determination of horizontal derivatives. Maps of the remotely measured current velocities are shown as well as time series, which are compared with data from current meters at different depths. The ratio of current-to-wind speed is determined for both horizontal components at different positions within the measuring area. Time series of divergence and curl are presented, and the magnitude of the linear (local) and nonlinear (advective) acceleration are compared.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2017-07-19
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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  • 3
    Publication Date: 2015-02-01
    Description: An observation network operating three Wellen Radars (WERAs) in the German Bight, which are part of the Coastal Observing System for Northern and Arctic Seas (COSYNA), is presented in detail. Major consideration is given to expanding the patchy observations over the entire German Bight on a 1-km grid and producing state estimates at intratidal scales, and 6- and 12-h forecasts. This was achieved with the help of the proposed spatiotemporal optimal interpolation (STOI) method, which efficiently uses observations and simulations from a free model run within an analysis window of one or two tidal cycles. In this way the method maximizes the use of available observations and can be considered as a step toward the “best surface current estimate.” The performance of the analysis was investigated based on the achieved reduction of the misfit between model and observations. The complex dynamics of the study domain was illustrated based on the spatial and temporal changes of tidal ellipses for the M2 and M4 constituents from HF radar observations. It was demonstrated that blending observations and numerical modeling facilitates physical interpretation of processes such as the nonlinear distortion of the Kelvin wave in the coastal zone and in particular in front of the Elbe and Weser estuaries. Comparisons with in situ data acquired outside the area covered by the HF radar demonstrated that the analysis method is able to propagate the HF radar information to larger spatial scales.
    Print ISSN: 0739-0572
    Electronic ISSN: 1520-0426
    Topics: Geography , Geosciences , Physics
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  • 4
    Publication Date: 1988-03-01
    Print ISSN: 0012-0308
    Electronic ISSN: 1616-7228
    Topics: Geosciences , Physics
    Published by Springer
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