Title | Long-term observations of daily acoustic travel time along the GoodHope transect at PIES Mooring GH01 (December 2014 – July 2015) |
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Project | South Atlantic Meridional Overturning Circulation (SAMOC-SA) |
Authors |
Sabrina Speich Tarron Lamont Gavin Louw Marcel van den Berg Chris Meinen Rigoberto Garcia Renellys Perez Shenfu Dong |
Publisher | Department of Forestry, Fisheries and the Environment (2024) |
Contributors |
Contact Person: Gavin Louw |
Abstract | Here we present processed travel time from a Pressure-equipped Inverted Echo Sounder (PIES) located at a depth of 4562m at location GH01 (35.2606°S; 14.0440°E) along the GoodHope transect in the Cape Basin region of the South Atlantic Ocean, between 6 December 2014 and 24 July 2015. The South African component of the international South Atlantic Meridional Overturning Circulation project (SAMOC-SA) aims to characterise the time-mean and time-varying components of the SAMOC in the South Atlantic Ocean and monitor the variability of the main Southern Ocean frontal systems associated with the Antarctic Circumpolar Current (ACC), south of Africa. |
Methods | A bottom-mounted, upward-looking, Pressure-equipped Inverted Echo Sounder (PIES) was deployed at a depth of 4562m at location GH01 (35.2606°S; 14.0440°E) along the GoodHope transect in the Cape Basin region of the South Atlantic Ocean. The instrument measured hourly bottom pressure and acoustic travel time (Tau), between 6 December 2014 and 24 July 2015. Measurements were de-tided, de-drifted, and de-spiked, using standard published University of Rhode Island (URI) software and protocols. A 72-hour 2nd order Butterworth filter was applied to hourly bottom pressure and acoustic travel time (Tau) observations. Tau values were then calibrated to a nominal pressure of 1000 db, and together with pressure observations, Tau was then subsampled to one value per day at noon (UTC). Bottom pressure anomalies have been computed relative to the record length average. |
Data | |
Temporal extent | 06 Dec 2014 – 24 Jul 2015 |
Geographic extent |
Cape Basin, South Atlantic Ocean
Lat: -35.2606 |
Vertical extent |
Max: -4562 m Min: -4562 m |
Keywords | GoodHope transect, moorings, PIES, Pressure-equipped Inverted Echo Sounder, SOUTH ATLANTIC OCEAN |
Related resources |
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