Title Long-term observations of daily acoustic travel time along the SAMBA transect at PIES Mooring P5 (September 2021 – September 2023)
Project South Atlantic Meridional Overturning Circulation (SAMOC-SA)
Authors

Tarron Lamont
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientist; contact details: email: tlamont@dffe.gov.za

Gavin Louw
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: glouw@dffe.gov.za

Marcel van den Berg
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: mvdberg@dffe.gov.za

Renellys Perez
Atlantic Oceanographic and Meteorological Laboratory (AOML); role: Marine Scientist; contact details: email: Renellys.C.Perez@noaa.gov

Shenfu Dong
Atlantic Oceanographic and Meteorological Laboratory (AOML); role: Marine Scientist; contact details: email: Shenfu.Dong@noaa.gov

Rigoberto Garcia
Atlantic Oceanographic and Meteorological Laboratory (AOML); role: Marine Scientist; contact details: email: Rigoberto.Garcia@noaa.gov

Sabrina Speich
Ecole Normale Supérieure (ENS) Laboratoire de Météorologie Dynamique (LMD); role: Marine Scientist; contact details: email: sabrina.speich@lmd.ens.fr

Chris Meinen
Atlantic Oceanographic and Meteorological Laboratory (AOML); role: Marine Scientist; contact details: email: chris.meinen@gmail.com

Publisher Department of Forestry, Fisheries and the Environment (2024)
Contributors

Contact Person: Gavin Louw
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientific Technician; contact details: email: mrgavinl@gmail.com

Abstract Here we present processed travel time from a Pressure-equipped Inverted Echo Sounder (PIES) located at a depth of 4969m at location P5 (34.5068°S; 11.1968°E) along the South Atlantic Meridional Overturning Circulation (MOC) Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean, between 29 September 2021 and 20 September 2023. 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 4969m at location P5 (34.5068°S; 11.1968°E) along the South Atlantic MOC Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean. The instrument measured hourly bottom pressure and acoustic travel time (Tau), between 29 September 2021 and 20 September 2023. 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
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 29 Sep 2021 – 20 Sep 2023
Geographic extent

Cape Basin, South Atlantic Ocean

Lat: -34.5068
Lon: 11.1968

Vertical extent Max: -4969 m
Min: -4969 m
Keywords moorings, PIES, Pressure-equipped Inverted Echo Sounder, SAMBA transect, SOUTH ATLANTIC OCEAN
Related resources
  • This digital object is new version of Raw PIES data for long-term observations of acoustic travel time (tau) and bottom pressure along the SAMBA transect at PIES P5 (September 2021 - September 2023) (10.15493/DEA.MIMS.13792023)
  • This digital object is part of Long-term moored observations from the eastern part of the South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) (10.15493/DEA.MIMS.26052050)