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

Vidal, Juan; Berrocoso, Manuel; Fernández-Ros, A.

doi:10.1017/s095410201100068x

Cited by 19 publications

(24 citation statements)

References 17 publications

(27 reference statements)

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“…The achievement of this work with respect to the results of Vidal et al (2012) can be summarized as follows: i) the MSL was calculated based on a long-term time series (more than two years of records), versus the seasonal series of only three months of records, ii) the orthometric height of the geodetic reference benchmarks were obtained and a new, more accurate orthometric height is provided for geodetic vertex LN00, iii) more accurate values were obtained for the reference benchmarks, the difference being +0.06 m for BEJC and +0.20 m for COLA relative to values in Vidal et al (2012).…”

Section: Discussionmentioning

confidence: 57%

Determination of the mean sea level at Deception and Livingston islands, Antarctica

2014

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IntroductionAccording to Dragani et al. (2004), the first observations of the sea levels at Deception Island were made in 1991. Tidal data were obtained over four days in summer by a visual tide staff located near the Decepción Station (Argentina) geodetic benchmark (BARG). This geodetic benchmark, belonging to the Deception Island geodetic network (REGID), was used as the vertical and horizontal datum. Based on these tidal data, an orthometric height value of 2.547 m for the BARG was calculated. This orthometric level was translated by geometric levelling to the point LN00, the fundamental point of the levelling network of Deception Island (RENID); the mean sea level obtained relative to LN00 was 5. Instrumentation and dataData were obtained using two moorings, each with a SAIV TD304 bottom pressure sensor at points near the coast, obtaining average local values of depth of the tide gauge of 3.147 m at Deception Island and 7.475 m at Livingston Island. The tidal observations at DECMAR and LIVMAR stations were made between February 2011 and April 2013.Pressure (P), temperature (T) and conductivity (C) data were recorded at the stations with a CTD SAIV SD 204 sensor that has an accuracy of ± 0.02 ppt for salinity, S, (derived from P, T and C) and ± 0.01ºC for T. Additionally, AQUAlogger 520 PT were used. These sensors have an accuracy of ± 0.05°C for T and 0.005% of full scale (10 m) for P. The geometric levelling was made using a Leica model NA2 optical level with an accuracy of ± 0.7 mm for one kilometre double run levelling. The GPS data for positioning of benchmarks and stations were taken from Vidal et al. MethodologyTo convert hydrostatic pressure into a sea level equivalent height P = P a + ρgh was used, where P is the pressure registered by the sensor of the tide gauge, P a is the atmospheric pressure, g is the acceleration due to gravity (average value calculated for Deception Island is 9.822083 m s -2 ) and ρ the density of the water in the study area, calculated using the records of T and S.Vidal et al. (2012) used a constant reference value of 990.8 mb (hPa) as P a which corresponds to the average value of P a in the region during the period 1978-89 (Rakusa-Suszczewski et al. 1992. The sea level for any particular time can be corrected by adding or subtracting the changes caused by P a changes on the reference values: at low enough frequency the correction is c. -1 cm of sea surface height for every +1 mb (hPa) of P a (Chelton & Enfield 1986). For this study, records of P a were taken concurrently with the tidal measurements, obtaining average values of 988.39 mb at Deception Island and 987.27 mb at Livingston Island.

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Section: Discussionmentioning

confidence: 57%

Determination of the mean sea level at Deception and Livingston islands, Antarctica

2014

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“…The ocean tides at Deception Island have a semidiurnal amplitude of 1.32 m and diurnal amplitude of 1.14 m (Vidal et al . 2012). However, we see no evidence for a significant semidiurnal signal in the correlogram.…”

Section: Discussionmentioning

confidence: 99%

Unusual signals recorded by ocean bottom seismometers in the flooded caldera of Deception Island volcano: volcanic gases or biological activity?

Bowman

Wilcock

2013

Antartic science

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An ocean bottom seismometer (OBS) network was deployed for 1 month at Deception Island volcano, Antarctica, in early 2005. Although only two volcano-tectonic and three long-period events were observed, the three OBSs located . 2 km apart inside the caldera detected over 3900 events that could not be attributed to known volcanic or hydrothermal sources. These events are found on one instrument at a time and occur in three types. Type 1 events resemble impulsive signals from biological organisms while type 2 and type 3 events resemble long-period seismicity. The largest number of events was observed in a region of volcanic resurgence and hydrothermal venting. All three types occur together suggesting a common cause and they show evidence for a diurnal distribution. The events are most likely to be due to aquatic animals striking the sensors, but a geological source is also possible. In the first case, these signals indicate the presence of a biological community confined to the caldera. In the second case, they imply widespread hydrothermal activity in Port Foster. Future OBS experiments should bury the seismometers, include a hydrophone, deploy instruments side-by-side, or include a video camera to distinguish between biological and geological events.

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“…Neptune’s Bellows is also the area where most of the tidal energy is dissipated (Vidal et al . 2012).…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic modelling of Port Foster, Deception Island, Antarctica

et al. 2017

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Over the last decade, the Antarctic continent has been the object of intensive scientific programmes. However, the emphasis of these studies rarely focuses on the Antarctic as a source of potential elements such as mercury. The release of mercury to the environment is known to occur at Deception Island, associated with volcanic activity. In this study, a 3D hydrodynamic model was used to assess the role of water circulation on the dispersion of released mercury. Sea level variation and tidal circulation data were obtained. Residence time was calculated using two different approaches. Internal tide generation in summer and winter were recognized and the barotropic tidal components obtained. Lagrangian tracers were used to depict particle circulation (simulating particulate mercury) in a three month summer simulation for barotropic and baroclinic conditions. The results show that particles accumulate in the northern and western parts of the bay. It is acknowledged that the results of the 3D model are associated with a non-negligible uncertainty, which can only be reduced with an ongoing commitment to monitoring. The findings of this study indicate that mercury accumulation is occurring in Port Foster (Deception Island), which is a potential threat to the local ecosystem.

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

Cited by 19 publications

References 17 publications

Determination of the mean sea level at Deception and Livingston islands, Antarctica

Determination of the mean sea level at Deception and Livingston islands, Antarctica

Unusual signals recorded by ocean bottom seismometers in the flooded caldera of Deception Island volcano: volcanic gases or biological activity?

Hydrodynamic modelling of Port Foster, Deception Island, Antarctica

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