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Theoretical variability of s1 in the tide generating potential

Theoretische schwankung der s 1 im gezeitenerzeugenden potential TIPAB-95

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Summary

The S1 tidal wave arising from the second order tidal potential occurs in any geophysical data record. Since the frequency of S1 is the same as that of earth’s rotation, many distortions are observed in real data sets. To isolate S1 from its powerful neighbours,K 1 and P1 at least one-year hourly data series are required. Studies onS 1 on an experimental basis, have been aimed mainly at a precise determination of its origin and mechanisms of variability. There are many hypotheses on its variability. In physical oceanography it is commonly accepted that the variability of S1 is due to air-sea interaction processes. The authors review most existing hypotheses on the variability of S1 They also show that the distortions of real data must be expected due to additional contributions from the second and third-order lunar potentials. An analysis is made to detect the sources of the additional contributions to the S1 frequency.

Zusammenfassung

Die Gezeitenwelle (Partialtide) S1 ist in jedem Datensatz gegenwärtig, der unter dem Einfluβ der Gezei tenkräfte aufgezeichnet wurde. Ihre Quelle ist das sonnentägliche Gezeitenpotential zweiter Ordnung. Die Frequenz S1 stimmt mit der der Erdrotation überein. In den beobachteten Datensätzen treten aber viele Stö rungen auf. Wenigstens ein Jahr stündlicher Beobachtungen ist erforderlich, um die S1 von ihren beiden mächtigen Nachbarn, nämlich derK 1 und P1 ,trennen zu können. In längeren Beobachtungsreihen tritt sie klar in Erscheinung. Viele Arbeiten über die S1 haben sich damit beschäftigt, ihren Ursprung und die Quelle ihrer Verände rung genau zu bestimmen. Es wurden aber auch viele Hypothesen hinsichtlich der in den Beobachtungen vorgefundenen Störungen aufgestellt. In dieser Arbeit wird eine neue Hypothese, die Veränderlichkeit der S1 betreffend, aufgezeigt, deren Grundlage die theoretische Entwicklung “TIPAB-95” des gezeitenerzeugenden Potentials ist.

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Alonso, J.J., Bruno, M. & Mañanes, R. Theoretical variability of s1 in the tide generating potential. Deutsche Hydrographische Zeitschrift 49, 457–466 (1997). https://doi.org/10.1007/BF02764340

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