Influence of tides on mass transport in the Bransfield Strait and the adjacent areas, Antarctic

Zhou, Xiangqian; Zhu, Guoping; Hu, Song

doi:10.1016/j.polar.2020.100506

Cited by 16 publications

(7 citation statements)

References 53 publications

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“…We suggest that in addition to the small spatial scale of the Bransfield Strait, ocean tides may be the main cause of the observed discrepancies. The tides in this region lead to variations in the sea level reaching several tens of centimeters (Zhou et al, 2020). Processing of satellite altimetry is based on tidal sea level variations predicted by numerical models.…”

Section: Discussionmentioning

confidence: 99%

“…The transport of the current is estimated at 1 Sv (Loṕez et al, 1999). Zhou et al (2020) showed that the diurnal tide constituents dominate the tidal residual current system in the shallow areas around the SSI. Strong internal vertical oscillations up to 30-40 m caused by the diurnal internal tide were revealed based on moored observations within the BC (Khimchenko et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Austral summer circulation in the Bransfield Strait based on SADCP measurements and satellite altimetry

et al. 2023

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Three-dimensional structure of currents in the Bransfield Strait (BS) was measured in 2017 over 50 transects across the strait using a Shipborne Acoustic Current Doppler Profiler (SADCP) onboard the R/V Akademik Sergey Vavilov and Akademik Ioffe. These data were used to determine local features of the three-dimensional velocity field of the currents. The sections crossed all three basins of the BS and the main flows in the strait including the Bransfield Current and the southwestward flow of Weddell Sea waters along the Antarctic Peninsula. Two vessels are equipped with different SADCP systems with frequencies of 76.8 kHz and 38.4 kHz, which allows us to compare the data from different SADCPs. The observations reveal that very dense waters from the Weddell Sea propagate in deep layers over the shelf break; this flow is usually not observed at the sea surface. Vertical structure of the Bransfield Current significantly differs from the flow of the Weddell Sea waters and its velocity maximum is located in the upper ocean layer. We also used two gridded altimetry products of 0.25° and 0.1° resolution for investigations of circulation in the BS. We analyzed the efficiency of satellite altimetry in reproducing currents in conditions of a narrow strait and evaluated its accuracy using field velocity observations. We found that satellite altimetry can be used for identification of the mean ocean circulation patterns within the BS. However, daily altimetry data contain significant discrepancies with the in situ data and require direct measurements for studies of the BS circulation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Austral summer circulation in the Bransfield Strait based on SADCP measurements and satellite altimetry

et al. 2023

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“…The pattern of the major currents in the study area was described earlier in the literature [31][32][33]. In the Bransfield Strait, a multidirectional (two jets) system of currents is observed: the continuation of the cold Antarctic Coastal Current (ACoC) flowing southwest and carrying the relatively cool and saline Transitional Zonal Water with Weddell Sea influence (TWW), and the warm Bransfield Current (BC) directed southeast along the South Shetland Islands and carrying the worm Transitional Zonal Water with Bellingshausen Sea influence (TBW) [34][35][36]. The Weddell Surface Water spreading zone is located in the Antarctic Sound [37], where the northward TWW is flowing in the southern, deep-sea part of the strait.…”

Section: Discussionmentioning

confidence: 99%

Age Structure and Spatial Distribution of Euphausia superba Larvae off the Antarctic Peninsula, Southern Ocean

Kasyan

2022

Water

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The Antarctic krill, Euphausia superba Dana, 1850, is a species forming high biomass and, therefore, playing a major role in the Antarctic marine food web. The age structure and patterns of spatial distribution of E. superba larvae in the waters of the Bransfield Strait (Antarctic Sound, Powell Basin), and off the South Orkney Islands, were studied based on data collected through a research survey in January and February 2022. Eggs and larvae (naupliar, calyptopis, and furcilia stages) of E. superba were found in these regions. Eggs and nauplii were concentrated in the southern, deep-sea part of the Antarctic Sound and over the northeastern and southwestern slopes of the Powell Basin, while calyptopis and furcilia larvae were concentrated north of the South Orkney Islands. The larvae abundance increased in an easterly direction. Four groups of communities comprising krill larvae at different development stages were identified. These groups were located in two subregions with the border between them running off the South Orkney Islands. The distribution and abundance of E. superba larvae showed a clear relationship with environmental conditions, in particular with a combination of such factors as sea surface temperature and chlorophyll a concentration.

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“…This blocking mechanism is strengthened by local bathymetry, which, close to the AB outlet, drops rapidly to over 2000 m, so that relatively shallow AB-shelf waters are only to a limited extent influenced by deep ocean hydrodynamics. Consequently, currents impacting the AB directly are forced by tides, with the Coriolis force playing a key role, which together drive full water exchange between the AB and the ocean in estimated 147 hours (Zhou et al, 2020).…”

Section: Study Areamentioning

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

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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.

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Influence of tides on mass transport in the Bransfield Strait and the adjacent areas, Antarctic

Cited by 16 publications

References 53 publications

Austral summer circulation in the Bransfield Strait based on SADCP measurements and satellite altimetry

Austral summer circulation in the Bransfield Strait based on SADCP measurements and satellite altimetry

Age Structure and Spatial Distribution of Euphausia superba Larvae off the Antarctic Peninsula, Southern Ocean

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

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