Title Raw CTD continuous observations from the Physical-Chemical Oceanography Cruise on the Africana Voyage 077, September 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 raw Conductivity-Temperature-Depth (CTD) continuous data collected between 11 September and 22 September 1989 during Voyage 077 on the FRS Africana, 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. There were several objectives for the Physical-Chemical Oceanography Cruise, covering Physical Environment (PE), Sedimentation and Nutrient cycling (SN), Chemical Environment (CE), Shoal Ecology (SE), Plankton studies (P) and testing of the new AIDA acoustic system with possible estimates of biomass in specific places such as in the baroclinic jets. The objectives included identifying and documenting near-surface and mid-water baroclinic jets west of Cape Columbine and Cape Town using acoustic doppler profiling and Conductivity-Temperature-Depth (CTD) data; observing currents in the upper 200m at regular intervals along the cruise track, using the Acoustic Doppler Current Profiler (ADCP); performing a 30 hour internal tide experiment at the shelf edge west of the Chamais Bay; deploying a series of current meter moorings on the Namibian remote shelf and eastern Cape Basin zones between Chamais Bay and Walvis Bay; servicing a weather station at Pelican Point; recovering a current meter array 90 miles west of Walvis Bay and re-deploying the Kiel sediment trap and current meter array at the same position; deploying the ruggedised Sea Fisheries Research Institute (SFRI) sediment traps in the vicinity of the Orange River and Conception Bay; taking box cores for on-board sediment core incubation at Conception Bay and the same Orange River Mouth site sampled in March 1989; running a set of CTD lines across the shelf to the vicinity of the shelf break; and lastly to draw samples from the labratory seawater sampling probe at regular intervals for fractionation, filtration and calibration of the in-line fluorometer.
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.
Data
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 11 Sep 1989 – 21 Sep 1989
Geographic extent

Benguela Current Large Marine Ecosystem (BCLME)

North: -22.5
South: -34.5
West: 12.0
East: 18.5

Vertical extent Max: -3752 m
Min: -1 m
Keywords Africana, Africana 077, 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 part of Physical-Chemical Oceanography Cruise on the Africana Voyage 077, September 1989 (10.15493/DEA.MIMS.11872023)
  • This digital object is previous version of Processed CTD continuous observations from the Physical-Chemical Oceanography Cruise on the Africana Voyage 077, September 1989 (10.15493/DEA.MIMS.11712023)