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Study of tides and sea levels at Deception and Livingston islands, Antarctica

Published online by Cambridge University Press:  17 October 2011

Juan Vidal ,
Manuel Berrocoso  and
Alberto Fernández-Ros
Juan Vidal*
Affiliation:
Centro Andaluz de Ciencia y Tecnologías Marinas (CACYTMAR), Universidad de Cádiz, Campus Río San Pedro s/n. 11510, Puerto Real, Cádiz, Spain
Manuel Berrocoso
Affiliation:
Laboratorio de Astronomía, Geodesia y Cartografía, Departamento de Matemáticas, Universidad de Cádiz, Facultad de Ciencias, Campus Río San Pedro s/n. 11510, Puerto Real, Cádiz, Spain
Alberto Fernández-Ros
Affiliation:
Laboratorio de Astronomía, Geodesia y Cartografía, Departamento de Matemáticas, Universidad de Cádiz, Facultad de Ciencias, Campus Río San Pedro s/n. 11510, Puerto Real, Cádiz, Spain
*
[email protected]
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Abstract

During the 2007–08 Spanish Antarctic campaign, two moorings of bottom pressure sensors were carried out over a ten week period. This paper presents the results of the tidal analysis from sea level records obtained at Deception and Livingston islands (South Shetland Islands, Antarctica). The main objective of this paper is to present a detailed study of the tidal characteristics at these two islands, for which statistical and harmonic analysis techniques are applied to the tidal records. A geodetic network was used to reference the pressure sensors. Geometric levelling, with an accuracy of 1 mm, allowed us to link the tidal marks with geodetic vertices located on Livingston and Deception islands. The amplitudes and phase lags obtained by harmonic analysis are compared to the harmonic constants of several coastal stations and co-tidal and co-range charts. Results show an evident influence of tides in the sea level signal, with a clear mixed semi-diurnal behaviour and a daily inequality between high and low waters. Measurements of salinity and temperature were made using electronic sensors. Results from this study showed that salinity and temperature were strongly influenced by tides. Seawater temperature varied in a manner that was consistent with the time series of residual bottom pressure.

Keywords

harmonic constituentsseawater temperaturetidal coefficientstidal gauge benchmark
Type
Physical Sciences
Information
Antarctic Science , Volume 24 , Issue 2 , 28 February 2012 , pp. 193 - 201
Copyright
Copyright © Antarctic Science Ltd 2011

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