Name: Raw PIES and current data for long-term observations of acoustic travel time (tau); bottom pressure and currents along the SAMBA transect at PIES P4 (October 2019 - October 2021)
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.07752023

Title	Raw PIES and current data for long-term observations of acoustic travel time (tau); bottom pressure and currents along the SAMBA transect at PIES P4 (October 2019 - October 2021)
Project	South Atlantic Meridional Overturning Circulation (SAMOC-SA)
Authors	Sabrina Speich Ecole Normale Supérieure (ENS) Laboratoire de Météorologie Dynamique (LMD); role: Marine Scientist; contact details: email: sabrina.speich@lmd.ens.fr Tarron Lamont Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE); role: Marine Scientist; contact details: email: tlamont@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 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 Chris Meinen Atlantic Oceanographic and Meteorological Laboratory (AOML); role: Marine Scientist; contact details: email: chris.meinen@gmail.com Rigoberto Garcia Atlantic Oceanographic and Meteorological Laboratory (AOML); role: Marine Scientist; contact details: email: Rigoberto.Garcia@noaa.gov 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
Publisher	Department of Forestry, Fisheries and the Environment (2023)
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 raw bottom pressure and acoustic travel time data from a Pressure-equipped Inverted Echo Sounder (PIES) located at a depth of 4500m at location P4 (34.500°S; 14.630°E) along the South Atlantic MOC Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean, between 12 October 2019 and 01 October 2021. The instrument was equipped with an additional 2000 khz Aanderaa Doppler Current Sensor (DCS) deployed at a depth of 4450m. In addition, both the PIES and the DCS were equipped with internal temperature sensors. 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 4500m at location P4 (34.500°S; 14.630°E) along the South Atlantic MOC Basin-scale Array (SAMBA) transect in the Cape Basin region of the South Atlantic Ocean. The instrument was set up to measure acoustic travel time (Tau) at 4 pings every 10 minutes, which were then internally averaged to save and output one Tau value per hour. Bottom pressure was recorded every 20 minutes, and then internally averaged to save and output one pressure value per hour. Tau and bottom pressure were recorded between 12 October 2019 and 01 October 2021. The instrument was equipped with an additional 2000 khz Aanderaa Doppler Current Sensor (DCS) deployed at a depth of 4450m, and set up to measure hourly current speed and direction. In addition, both the PIES and the DCS were equipped with internal temperature sensors.
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.07752023 Style Terms of use These data are made available with the express understanding that any such use will properly acknowledge the originator(s) and publisher and cite the accession numbers and/or associated Digital Object Identifiers. Anyone wishing to use these data should properly cite and attribute the data providers listed as authors in the metadata provided with each dataset. It is expected that all the conditions of the data license will be strictly honoured. Use of any material herein should be properly cited using the dataset’s persistent identifiers such as accession numbers and DOIs. I agree to the terms of use
Temporal extent	12 Oct 2019 – 01 Oct 2021
Geographic extent	Cape Basin, South Atlantic Ocean North: -34.5 South: -34.501 West: 14.63 East: 14.631
Vertical extent	Max: -4450 m Min: -4450 m
Keywords	currents, moorings, PIES, Pressure-equipped Inverted Echo Sounder, SAMBA transect, SOUTH ATLANTIC OCEAN
Related resources	This digital object continues 10.17882/70364 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) This digital object is previous version of Long-term observations of daily acoustic travel time along the SAMBA transect at PIES Mooring P4 (October 2019 – October 2021) (10.15493/DEA.MIMS.07992023) This digital object is previous version of Long-term observations of daily bottom currents along the SAMBA transect at PIES Mooring P4 (October 2019 – October 2021) (10.15493/DEA.MIMS.08172023)

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