| Title | Processed CTD discrete observations from the West Coast Hake Biomass on the Africana Voyage 028, January 1985 |
|---|---|
| Project | West Coast Hake Biomass |
| Authors |
Makhetha, Mbulelo Tutt, Gavin Lamont, Tarron |
| Publisher | Department of Forestry, Fisheries and the Environment (2022) |
| Contributors |
Contact Person: Tutt, Gavin |
| Abstract | This is processed Conductivity-Temperature-Depth (CTD) discrete data from the West Coast Hake Biomass on the Africana Voyage 028, collected between 7 and 30 January 1985. The cruise operated in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa. The objectives of this cruise were to survey by means of trawling the abundance of adult and recruiting hake; to investigate the diurnal cycle and the environment of hake and other demersal species; to compare trawling results of R.S. Africana with those of the Chicha Touza, the Spanish trawler used for similar surveys; to carry out acoustic target identification of mesopelagic species using RMT 8 nets and to retrieve two current meter arrays deployed during Voyage 025. |
| 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 | |
| Temporal extent | 07 Jan 1985 – 30 Jan 1985 |
| Geographic extent |
Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa
North: -28.5 |
| Vertical extent |
Max: -518.9 m Min: -0.2 m |
| Keywords | Africana , Africana 028 , Conductivity , CTD , Depth , EOV: Physics > Subsurface salinity , EOV: Physics > Subsurface temperature , Neil Brown CTD , SOUTH ATLANTIC OCEAN , Temperature |
| Related resources |
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