Title Processed CTD continuous observations from the South-east Atlantic Expedition on the Africana Voyage 071, April 1989
Authors

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

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

Publisher Department of Forestry, Fisheries and the Environment (2023)
Contributors

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

Abstract Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 04 April and 02 May 1989 during Voyage 071 on the FRS Africana, South Atlantic Ocean and in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of Southern Africa. Neil Brown MK3 and MK4 CTD instruments were used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises between 1983 and 2000. The South-east Atlantic Expedition had as its main objectives the investigation of the distribution and abundance of phyllosoma larvae of Jasus in the Cape Basin, a comparative study of larval recruitment of Jasus tristani and Jasus lalandii, and the investigation of the circulation in, and ventilation of, the south western Cape Basin. The work was aimed at improving the understanding of the dynamics, in particular recruitment, of rock lobsters in the South-east Atlantic, and at furthering knowledge about some key large scale physical processes which are thought to be important in regulating the distribution and abundance of a number of exploited stocks in the Benguela region.
Methods Neil Brown MK3 and MK4 Conductivity-Temperature-Depth (CTD) instruments were used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises between 1983 and 2000. Temperature was converted from the IPTS-68 scale to the ITS-90 scale, and salinity was computed from conductivity measurements on the 1978 Practical Salinity Scale, according to UNESCO (1991) algorithms. UNESCO (1993) quality control procedures were applied to the data, and obvious erroneous values resulting from problems including electronic spikes, data collection in air, inadequate flow through the conductivity cell, among others, have been removed. Any additional calibrations or corrections have been specified in each data file, where applicable and available.
Data
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 05 Apr 1989 – 01 May 1989
Geographic extent

Benguela Current Large Marine Ecosystem (BCLME)

North: -28.5
South: -42.5
West: -16.5
East: 14.0

Vertical extent Max: -5097 m
Min: -0.01 m
Keywords Africana, Africana 071, Conductivity, CTD, Depth, Neil Brown CTD, SOUTH ATLANTIC OCEAN, Temperature
Related resources
  • This digital object is described by https://unesdoc.unesco.org/ark:/48223/pf0000090489
  • This digital object is described by https://unesdoc.unesco.org/ark:/48223/pf0000138825
  • This digital object is new version of Raw CTD continuous observations from the South-east Atlantic Expedition on the Africana Voyage 071, April 1989 (10.15493/DEA.MIMS.11602023)
  • This digital object is part of South-east Atlantic Expedition on the Africana Voyage 071, April 1989 (10.15493/DEA.MIMS.11832023)