| Title | Processed CTD continuous observations from the South Coast Hake Biomass on the Africana Voyage 036, October 1985 |
|---|---|
| Authors |
Gavin Tutt Tarron Lamont |
| Publisher | Department of Forestry, Fisheries and the Environment (2022) |
| Contributors |
Contact Person: Gavin Tutt Contact Person: Tarron Lamont |
| Abstract | This is processed downcast Conductivity-Temperature-Depth (CTD) continous data from the South Coast Hake Biomass on the Africana Voyage 036, collected between 15 and 26 October 1985. The cruise operated in the Agulhas Current Large Marine Ecosystem (ACLME) region on the south coast of South Africa. The first objective of this cruise was to establish, by means of surveying and trawling between 200m and 500m water depths, the feasibility of extending the hake biomass surveys to the South Coast. The area 20 E to 25 E, from 75m to 200m water depths, has already been covered during biomass surveys by Japanese research vessels, accompanied on each occasion by one of the Institute's scientists. The feasibility of trawling shallower than 200m in this region, albeit with heavy gear, has thus already been established. The second objective was to investigate, by trawling, the depth distribution of squid in the area 23 30'E and 24 30'E, from as close as possible to the coast (i.e. as shallow as possible) to a depth of 500m. |
| 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 | 20 Oct 1985 – 26 Oct 1985 |
| Geographic extent |
Agulhas Current Large Marine Ecosystem (ACLME)
North: -34.0 |
| Vertical extent |
Max: -250.9 m Min: -1.5 m |
| Keywords | Africana, Africana 036, Conductivity, CTD, Depth, INDIAN OCEAN, Neil Brown CTD, Temperature |
| Related resources |
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