| Title | Preliminary processed CTD continuous observations from the Algoa Voyage 242, August 2017 |
|---|---|
| Project | Integrated Ecosystem Programme: Southern Benguela (IEP: SB) |
| Authors |
Gavin Tutt |
| Publisher | Department of Forestry, Fisheries and the Environment (2021) |
| Contributors |
Contact Person: Gavin Tutt |
| Abstract | SeaBird CTD Conductivity-Temperature-Depth (CTD) instruments were used to measure pressure, temperature and conductivity through the water column. During some cruises additional instruments for oxygen, fluorescence, Photosynthetically Available Radiation (PAR), Surface PAR (SPAR), turbidity, beam attenuation, beam transmission measurements were connected to the CTD unit. Here we present preliminary processed downcast CTD continuous data collected between 24 August 2017 and 30 August 2017, during Voyage 242 on the Algoa, in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa. This data was collected as part of the Intergrated Ecosystem Programme: Southern Benguela (IEP:SB), which has been conducting multi-disciplinary long-term monitoring along the Kleinsee, Namaqualand, Elands/St Helena Bay and Scarborough transects off the west coast of South Africa since 2013. This dataset was processed using older standards which may not align with international best practices and the standards currently adhered to by the Department of Forestry, Fisheries and the Environment (DFFE). The Department is re-processing and replacing data to ensure everything has the same format and is of the same quality and datasets will be marked as obsoleted once that is done. As such the user assumes the entire risk related to the use of these data in its current state and format. DFFE disclaims all warranties of the data whether expressed or implied, including without limitation, any warranties of merchantability or fitness for a particular purpose. For any concerns regarding the data, the user may decide to liaise with the listed PIs who will share their insight on the data quality, where possible. It is also strongly recommended that the user liaises with the listed PIs regarding their proposed projects to mitigate against duplication of research efforts. |
| Methods | Since 2000, SeaBird Conductivity-Temperature-Depth (CTD) instruments have been used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises. During some cruises, additional instruments for oxygen, fluorescence, Photosynthetically Available Radiation (PAR), Surface PAR (SPAR), turbidity, beam attenuation, beam transmission measurements were connected to the CTD unit. Here we present preliminary processed downcast CTD profile data collected between 24 and 30 August 2017, during Voyage 242 on the Algoa. Temperature is presented on the ITS-90 scale, and salinity was computed from conductivity measurements on the 1978 Practical Salinity Scale, according to UNESCO (1991) algorithms. Minimal quality control procedures were applied to the data to remove obvious erroneous values resulting from problems including electronic spikes, data collection in air, inadequate flow through the conductivity cell, among others. Data has not been verified and no additional calibrations or corrections have been applied as yet. |
| Data | |
| Temporal extent | 24 Aug 2017 – 30 Aug 2017 |
| Geographic extent |
Benguela Current Large Marine Ecosystem (BLMCE), west coast of South Africa
North: -29.0 |
| Vertical extent |
Max: -2.0 m Min: -1022.0 m |
| Keywords | Beam Attenuation, Beam Transmission, conductivity, continuous, CTD, Density, Fluorometer, Oxygen, PAR, Photosynthetically Available Radiation, pressure, salinity, SeaBird CTD, Sound Velocity, SOUTH ATLANTIC OCEAN, SPAR, Surface PAR, temperature, Turbidity |
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