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

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 t...

Full description

Bibliographic Details
Published in:Frontiers in Marine Science
Main Authors: Dmitry Frey, Viktor Krechik, Alexandra Gordey, Sergey Gladyshev, Dmitry Churin, Ilya Drozd, Alexander Osadchiev, Sergey Kashin, Eugene Morozov, Daria Smirnova
Format: Article in Journal/Newspaper
Language:English
Published: Frontiers Media S.A. 2023
Subjects:
Bransfield Strait
Antarctic Peninsula region
SADCP
satellite altimetry
ocean circulation
Science
Q
General. Including nature conservation
geographical distribution
QH1-199.5
Antarctic
The Antarctic
Antarctic Peninsula
Weddell Sea
Austral
Weddell
Antarc*
Online Access:https://doi.org/10.3389/fmars.2023.1111541
https://doaj.org/article/87f3c1c419b84d3bb2433b22e389501d
Description
Summary: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.

Similar Items