Glaciomarine sedimentation and submarine geomorphology in Admiralty Bay, South Shetland Islands, Antarctica

Magrani, Fábio; Neto, Arthur Ayres; Vieira, Rosemary

doi:10.1109/rioacoustics.2015.7473614

Cited by 3 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This advance is the most extensive of the last 3,500 cal (Hall, 2007). Magrani et al (2015) showed a variable and irregular bottom morphology of AB and the submarine landforms observed in the modern setting of MI and AB. The submarine and terrestrial landforms oriented transverse to the direction of ice flow to reveal long-term changes in glacier terminus position (Dowdeswell et al 2016, Chandler et al 2016.…”

Section: Introductionmentioning

confidence: 89%

“…The sub-bottom profiler Kongsberg SBP 300 was operated with a ping-rate of 1000 ms, 2 ms pulse, and frequency envelope from 2.5 to 6.5 kHz. Magrani et al (2015) shown the track map with the locations of the profiler lines of the subbottom SBP 300, Kongsberg and Edgetech 3200 surveys (Figure 2). The Simrad EM 302 multibeam, aboard the SKUA boat, was used to obtain coverage of all depths (including the <-200m) in five non-uniform spacing and parallel transects along the fjord.…”

Section: Datasets and Methodologymentioning

confidence: 99%

“…The sub-bottom profiler records by Magrani et al (2015) (based on 2009 and 2013 field activities) and geomorphological observations based on 2007, 2010, and 2011 field activities were compiled and analyzed. The seismic or sub-bottom data was only used to extract seafloor depth and no seismic facies analysis was performed.…”

Section: Seismic Observationsmentioning

confidence: 99%

See 2 more Smart Citations

Geomorphology of Martel inlet, King George Island, Antarctica: a new interpretation based on multi-resolution topo-bathymetric data

Perondi

Rosa

Vieira

et al. 2022

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 89%

Section: Datasets and Methodologymentioning

confidence: 99%

See 1 more Smart Citation

Geomorphology of Martel inlet, King George Island, Antarctica: a new interpretation based on multi-resolution topo-bathymetric data

Perondi

Rosa

Vieira

et al. 2022

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

“…AB has an area of 135 km 2 and has been previously described as a wide fjord, however, geomorphologically, it is a tectonic estuary (Valle-Levinson, 2010), formed by geological faults (Majdański et al, 2008), which explains its distinction from northern hemisphere fjords. For the purposes of this study, a new, hitherto most precise bathymetric map of AB has been created, compiling data from (Battke, 1990;Magrani et al, 2016;Majdański et al, 2008) and selfconducted ADCP measurements (Fig. 1 b).…”

Section: Study Areamentioning

confidence: 99%

“…2018/31/B/ST10/00195 'Observations and modeling of sea ice interactions with the atmospheric and oceanic boundary layers'. Special thanks are owed to Laboratory of Sedimentary and Environmental Processes -INCT-Criosfera Fluminense Federal University -Geoscience Institute in Brazil for providing us with bathymetric data from Admiralty Bay, described in (Magrani et al, 2016). We are thankful to Deltares for making Delft3D Flow model available for calculations.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Influence of glacial influx on the hydrodynamics of Admiralty Bay, Antarctica - a case study based on combined hydrographic measurements and numerical modeling

Osińska,

Herman

2023

Preprint

View full text Add to dashboard Cite

This study investigates the impact of glacial water discharges on the hydrodynamics of Admiralty Bay (AB) in the South Shetland Islands, a wide bay adjacent to twenty marine-terminating glaciers. From December 2018 until February 2023, AB water properties were measured on 136 days. This dataset showed that a maximally two-layered stratification occurs in AB, and that glacial water is always the most buoyant water mass. Using the Delft3D Flow, a three-dimensional hydrodynamical model of AB was developed. During tests, the vertical position and initial velocity of glacial discharges have been shown to be insignificant for the overall bay circulation. Fourteen model scenarios have been calculated with an increasing glacial influx added. The AB general circulation pattern consists of two cyclonic cells. Even in scenarios with significant glacial input, water level shifts and circulation are predominantly controlled by the ocean. Glacial freshwater is carried out of AB along its eastern boundary in a surface layer no thicker than 60 m. Within the inner AB inlets, significant glacial influx produces buoyancy-driven vertical circulation. Using an innovative approach combining hydrographic and modeling data, a four-year, unprecedentedly high-resolution timeseries of glacial influx volumes into AB has been produced. On average, glacial influx summer values are >10 times greater than in spring and winter and 3 times higher than in autumn. The annual glacial influx into AB was estimated at 0.525 Gt. Overall, it was demonstrated how the topography and forcing controlling the hydrodynamics of an Antarctic bay differs from that of well-studied northern-hemisphere fjords.

show abstract

Influence of glacial influx on the hydrodynamics of Admiralty Bay, Antarctica - study based on combined hydrographic measurements and numerical modeling

Osińska,

Herman

2024

Front. Mar. Sci.

View full text Add to dashboard Cite

This study investigates the impact of glacial water discharges on the hydrodynamics of a glacial bay in Antarctica, comparing it to well-studied northern hemisphere fjords. The research was carried out in Admiralty Bay (AB) in the South Shetland Islands, a wide bay adjacent to twenty marine-terminating glaciers. From December 2018 until February 2023, AB water properties were measured on 136 days. This dataset showed that a maximally two-layered stratification occurs in AB and that glacial water is always the most buoyant water mass. Using the Delft3D Flow, a three-dimensional hydrodynamical model of AB was developed. During tests, the vertical position and initial velocity of glacial discharges have been shown to be insignificant for the overall bay circulation. Fourteen model scenarios have been calculated with an increasing glacial influx added. The AB general circulation pattern consists of two cyclonic cells. Even in scenarios with significant glacial input, water level shifts and circulation are predominantly controlled by the ocean. Glacial freshwater is carried out of AB along its eastern boundary in a surface layer. Freshwater thickness in this outflow current is maximally 0.27-0.35 m. Within the inner AB inlets, significant glacial influx produces buoyancy-driven vertical circulation. Using an approach combining hydrographic and modeling data, a four-year timeseries of glacial influx volumes into AB has been produced. On average, glacial influx in summer is 10 times greater than in spring and winter and 3 times higher than in autumn. The annual glacial influx into AB was estimated at 0.434-0.632 Gt. Overall, the study demonstrated the unique characteristics of the topography and forcings that influence the hydrodynamics of an Antarctic glacial bay.

show abstract

Glaciomarine sedimentation and submarine geomorphology in Admiralty Bay, South Shetland Islands, Antarctica

Cited by 3 publications

References 13 publications

Geomorphology of Martel inlet, King George Island, Antarctica: a new interpretation based on multi-resolution topo-bathymetric data

Geomorphology of Martel inlet, King George Island, Antarctica: a new interpretation based on multi-resolution topo-bathymetric data

Influence of glacial influx on the hydrodynamics of Admiralty Bay, Antarctica - a case study based on combined hydrographic measurements and numerical modeling

Influence of glacial influx on the hydrodynamics of Admiralty Bay, Antarctica - study based on combined hydrographic measurements and numerical modeling

Contact Info

Product

Resources

About