Name: Long-term observations of daily acoustic travel time along the SAMBA transect at PIES Mooring P4 (October 2021 – September 2023)
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.13862023

Title	Long-term observations of daily acoustic travel time along the SAMBA transect at PIES Mooring P4 (October 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 4507m at location P4 (34.5010°S; 14.6307°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 1 October 2021 and 19 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 4507m at location P4 (34.5010°S; 14.6307°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 1 October 2021 and 19 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) Cite 10.15493/DEA.MIMS.13862023 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	01 Oct 2021 – 19 Sep 2023
Geographic extent	Cape Basin, South Atlantic Ocean Lat: -34.501 Lon: 14.6307
Vertical extent	Max: -4507 m Min: -4507 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 P4 (October 2021 - September 2023) (10.15493/DEA.MIMS.13772023) 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)

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