Title Preliminary processed CTD continuous observations from the Algoa Voyage 246, February 2018
Project Integrated Ecosystem Programme: Southern Benguela (IEP: SB)
Authors

Gavin Tutt
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE) Marine Scientific Technician 2nd Floor, Foretrust Building, Martin Hammerschlag Way, Cape Town, South Africa, Gtutt@environment.gov.za

Publisher Department of Forestry, Fisheries and the Environment (2021)
Contributors

Contact Person: Gavin Tutt
Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE) Marine Scientific Technician 2nd Floor, Foretrust Building, Martin Hammerschlag Way, Cape Town, South Africa, gtsglider@gmail.com

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 15 February 2018 and 22 February 2018, during Voyage 246 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.
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 15 and 22 February 2018, during Voyage 246 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
Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Temporal extent 15 Feb 2018 – 22 Feb 2018
Geographic extent

Benguela Current Large Marine Ecosystem (BLMCE), west coast of South Africa

North: -29.0
South: -35.0
West: 14.0
East: 19.0

Vertical extent Max: -1.0 m
Min: -1019.0 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
Related resources