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296 datasets found Page 1 of 12
DOI: 10.15493/DEA.MIMS.37092025
Processed CTD discrete observations from the Demersal South Coast Biomass Survey on the Africana Voyage 129, April 1995

Here we present processed discrete Conductivity-Temperature-Depth (CTD) continuous data collected between 23 April 1995 and 15 May 1995, during the Demersal South Coast Biomass Survey on the Africana Voyage 129, in the Agulhas Current Large Marine Ecosystem (ACLME) region on the south coast of Southern Africa. The main objective of the cruise was to survey demersal fish stocks and collect hydrological data.

DOI: 10.15493/DEA.MIMS.36092025
Processed CTD continuous observations from the Demersal South Coast Biomass Survey on the Africana Voyage 129, April 1995

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 23 April 1995 and 15 May 1995, during the Demersal South Coast Biomass Survey on the Africana Voyage 129, in the Agulhas Current Large Marine Ecosystem (ACLME) region on the south coast of Southern Africa. The main objective of the cruise was to survey demersal fish stocks and collect hydrological data.

DOI: 10.15493/DEA.MIMS.34092025
Processed CTD continuous observations from the Plankton Dynamics During an Upwelling Cycle on the Africana Voyage 128, February 1995

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 16 February 1995 and 26 February 1995, during the Plankton Dynamics During an Upwelling Cycle cruise on the Africana Voyage 128, in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of Southern Africa. The main objective of the cruise was to study plankton processes following upwelling and to track upwelled water masses with drogues.

DOI: 10.15493/DEA.MIMS.33092025
Processed CTD discrete observations from the West Coast Demersal Biomass Survey on the Africana Voyage 127, January 1995

Here we present processed downcast Conductivity-Temperature-Depth (CTD) discrete data collected between 07 January 1995 and 02 February 1995, during the West Coast Demersal Biomass Survey on the Africana Voyage 127, in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of Southern Africa. The main objective of the cruise was to estimate the abundance of hake and other demersal species and to collect hydrological data.

DOI: 10.15493/DEA.MIMS.32092025
Processed CTD continuous observations from the West Coast Demersal Biomass Survey on the Africana Voyage 127, January 1995

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 07 January 1995 and 02 February 1995, during the West Coast Demersal Biomass Survey on the Africana Voyage 127, 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. The main objective of the cruise was to estimate the abundance of hake and other demersal species and to collect hydrological data.

DOI: 10.15493/SOMISANA.26032025
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SA-West Hindcast V1.0

The SA-West Hindcast V1.0 product provides a 32 year historical representation of the ocean state for the west coast of South Africa. The model was developed using the Coastal and Regional Ocean COmmunity (CROCO) modelling system. The model curvilinear grid has a variable horizontal grid resolution (1 – 2.5 km) which increases toward the coast. The model has 30 terrain-following (sigma) vertical levels. Open boundary conditions for the model are obtained from GLORYS12V1. Surface forcing is interpolated from ERA5. Model bathymetry is interpolated from digital navigation charts provided by SANHO. This configuration does not include tides. The model configuration files can be found at the somisana-croco github repository using compile options in the `C01` directory in the provided link. NetCDF model output files are available as daily averages throughout the water column, and hourly averages for the surface layer of the model. Subsets of the files can be downloaded via Thredds...

DOI: 10.15493/SOMISANA.23042026
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SA-Southeast Hindcast V1.0

The SA-Southeast Hindcast V1.0 product provides a 10 year historical representation of the ocean state along the southeastern coast of South Africa centered around Algoa Bay. The model was developed using the Coastal and Regional Ocean COmmunity (CROCO) modelling system. The model curvilinear grid has a variable horizontal grid resolution (0.5 – 3 km) which increases toward the coast. The model has 30 terrain-following (sigma) vertical levels. Open boundary conditions for the model are obtained from GLORYS12V1. Surface forcing is interpolated from the 3 km resolution Wind Atlas for South Africa (WASA) product provided by the Climate Systems Analysis Group (CSAG). Model bathymetry is interpolated from digital navigation charts provided by SANHO. This configuration does not include tides. The model configuration files can be found at the somisana-croco github repository using compile options in the `C01` directory in the provided link. NetCDF model output files are available as daily...

DOI: 10.15493/DEA.MIMS.20240821
Raw data collected by Seaglider SG573 off Cape Town for CTD calibration (SeaTrials 2)

The Gliders in the Agulhas (GINA) project is a multi-institutional effort to implement sustained glider observations around South Africa’s coastline to enhance existing regional networks and complement larger international observations systems such as the Ocean Gliders Boundary Ocean Observing Network (BOON). This dataset includes all data collected by Seaglider SG573 during the first GINA deployment in 2018. The Seaglider was set-up to vertically profile the water column between depths of 0 and 1000m. Measurements collected included conductivity (salinity), temperature, depth (CTD), dissolved oxygen, chlorophyll-a fluorescence (proxy for phytoplankton concentration), Photosynthetically Active Radiation (PAR) and two wavelengths of optical back-scattering by particles, Bb(470) and Bb(700) (proxies for particle concentration). In addition, information collected from the Seaglider was used to derive surface and depth averaged currents. This is raw data collected by Seaglider SG573...

DOI: 10.15493/DEA.MIMS.09022026
Behavioural responses of Cape fur seals Arctocephalus pusillus to swim-with-seal tourism activities in the Robberg Marine Protected Area in South Africa

Behavioural changes are often regarded as a key indicator of the effect of human disturbances on animals, and responses are commonly used as indices of disturbances. Tourism is an increasingly common source of disturbance to wild animals, including marine mammals. Swim-with-seals (SWS) tourism is an emerging industry that has grown in countries such as New Zealand, Australia and South Africa. We studied behavioural impacts of SWS in the Robberg Marine Protected Area (Western Cape, South Africa) on the adjacent Cape fur seal Arctocephalus pusillus pusillus colony through a modified Before-After-Control- Impact (BACI) behavioural study designed for simultaneous observations of impact and control sites (site factor) and before, during and after SWS activities (phase factor). Elevated observations were carried out at distances from the sites using sequential photography of the colony to enumerate seals in different behavioural categories, allowing comparisons between sites and between...

DOI: 10.15493/DEA.MIMS.08092025
Benthic‑bycatch dataset from Prince Edward and Marion Islands longline fisheries (2009‑2023)

This dataset presents a time series of benthic invertebrate bycatch records collected during pelagic longline fishing operations targeting Patagonian toothfish (Dissostichus eleginoides) in the Prince Edward Islands region of the sub-Antarctic Southern Ocean from 2009 to 2023. The data were obtained from independent scientific observers aboard commercial vessels in accordance with Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Conservation Measure 22-06, which mandates the reporting of taxa associated with Vulnerable Marine Ecosystems (VMEs). Each record includes an entry number, observer segment unique identifier, vessel unique identifier, observer logbook number, year the record was collected, line segment number, taxonomic code as given in 2009 CCAMLR VME guide, associated taxonomic name, bycatch weight at random segments per fishing line/set, gear type used, number of fishing hooks used at the specific segment, and anonymous vessel number. The...

DOI: 10.15493/DEA.MIMS.37112024
Short-term observations of hourly bottom temperatures on the continental shelf off Port St Johns, along the east coast of South Africa (December 2013 - September 2014)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability of Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 90m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns on the east coast of South Africa. Here we present processed hourly bottom temperatures (85 m) from an ADCP at location PJ (31.73°S; 29.51°E) on the continental shelf off Port St Johns, between December 2013 and September 2014.

DOI: 10.15493/DEA.MIMS.36112024
Short-term observations of daily bottom temperatures on the continental shelf off Port St Johns, along the east coast of South Africa (December 2013 - September 2014)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability off Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 90m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns on the east coast of South Africa. Here we present processed daily bottom temperatures (85 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the continental shelf off Port St Johns, between December 2013 and September 2014.

DOI: 10.15493/DEA.MIMS.35112024
Short-term observations of hourly bottom temperatures on the continental shelf off Port St Johns, along the east coast of South Africa (July 2013 - December 2013)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability of Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 95m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns on the east coast of South Africa. Here we present processed hourly bottom temperatures (90 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the continental shelf off Port St Johns, between July 2013 and December 2013.

DOI: 10.15493/DEA.MIMS.34112024
Short-term observations of daily bottom temperatures on the continental shelf off Port St Johns, along the east coast of South Africa (July 2013 - December 2013)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability off Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 95m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns on the east coast of South Africa. Here we present processed daily bottom temperatures (90 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the continental shelf off Port St Johns, between July 2013 and December 2013.

DOI: 10.15493/DEA.MIMS.33112024
Short-term observations of hourly currents on the continental shelf off Port St Johns, along the east coast of South Africa (December 2013 - September 2014)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability off Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 90m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns, on the east coast of South Africa. Here we present processed magnitude and direction of hourly currents throughout the water column (4.24 - 90.24 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the continental shelf off Port St Johns, between December 2013 and September 2014.

DOI: 10.15493/DEA.MIMS.32112024
Short-term observations of daily currents on the continental shelf off Port St Johns, along the east coast of South Africa (December 2013 - September 2014)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability off Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 90m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns, on the east coast of South Africa. Here we present processed magnitude and direction of daily currents throughout the water column (4.24 - 90.24 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the inner shelf off Port St Johns, between December 2013 and September 2014.

DOI: 10.15493/DEA.MIMS.31112024
Short-term observations of hourly currents on the continental shelf off Port St Johns, along the east coast of South Africa (July 2013 - December 2013)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability off Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 95m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns, on the east coast of South Africa. Here we present processed magnitude and direction of hourly currents throughout the water column (2 - 86 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the continental shelf off Port St Johns, between July 2013 and December 2013.

DOI: 10.15493/DEA.MIMS.30112024
Short-term observations of daily currents on the continental shelf off Port St Johns, along the east coast of South Africa (July 2013 - December 2013)

Between 2013 and 2014, a short-term mooring deployment was conducted to determine the oceanographic characteristics and variability off Port St Johns, along the east coast of South Africa. One mooring (PJ) was deployed, at a depth of 95 m, between July 2013 and September 2014. This mooring measured currents, as well as sub-surface bottom temperatures on the continental shelf off Port St Johns, on the east coast of South Africa. Here we present processed magnitude and direction of daily currents throughout the water column (2 - 86 m) from an Acoustic Doppler Current Profiler (ADCP) at location PJ (31.73°S; 29.51°E) on the inner shelf off Port St Johns, between July 2013 and December 2013.

DOI: 10.15493/DEA.MIMS.20112024
Experimental manipulations of the density of Cymbula granatina on rocky shore community

Densities of a commonly-harvested intertidal limpet Cymbula granatina were manipulated at two sites within a no-take marine protected area on the west coast of the Cape Peninsula in South Africa, using four treatment levels ranging from zero to maximum natural densities, together with control plots, to evaluate the effects of different harvesting intensities on rocky shore community composition. Following removal or thinning of C. granatina, community composition changed: cover of corticated and ephemeral algae increased and recruitment of C. granatina decreased. These outcomes were, however, dependent on the time frame considered, as algae underwent an annual cycle, and the effects of limpet removal were evident predominantly during the summer upwelling season when the algae proliferated. The management implications of the results of this experiment are discussed.

DOI: 10.15493/DEA.MIMS.14512023
Surface Chlorophyll a concentration and Secchi depth data from the SEAHAB project, March 2023

This was the in situ data collection for the Sensor-agnostic Estimation of Harmful Algal Blooms (SEAHAB) project, March 2023. The data represents two days of surface water sampling between Table Bay and Kommetjie for the purpose of satellite chlorophyll a concentration and water clarity validation.

DOI: 10.15493/DEA.MIMS.38042025
Short-term observations of daily currents at the Walters Shoal, southwest Indian Ocean at location WSN01 (26 May 2014 - 01 August 2015)

The Walters Shoal project, part of the broader African Coelacanth Ecosystem Programme (ACEP III), conducted an oceanographic and biological survey of the Walters Shoal, a shallow seamount in the southwest Indian Ocean, in order to understand the biodiversity and ecological processes occurring on this unique seamount. The project used a multidisciplinary approach that included the sampling of sponge fauna, fish populations, and oceanographic conditions. Oceanographic data (including moored ADCP data, CTD profiles, as well as underway S-ADCP and TSG data) was collected to understand the circulation patterns and hydrography that could influence the biological communities on the seamount. Here, we present the moored ADCP data that was collected to determine currents and sub-surface temperatures. Two ADCP moorings were deployed, one on the northern part and the other on the southern part of Walters Shoal, at depths of 500m, between May 2014 and August 2015. Here we present processed...

DOI: 10.15493/DEA.MIMS.37042025
Short-term observations of hourly currents at the Walters Shoal, southwest Indian Ocean at location WSN01 (25 May 2014 - 02 August 2015)

The Walters Shoal project, part of the broader African Coelacanth Ecosystem Programme (ACEP III), conducted an oceanographic and biological survey of the Walters Shoal, a shallow seamount in the southwest Indian Ocean, in order to understand the biodiversity and ecological processes occurring on this unique seamount. The project used a multidisciplinary approach that included the sampling of sponge fauna, fish populations, and oceanographic conditions. Oceanographic data (including moored ADCP data, CTD profiles, as well as underway S-ADCP and TSG data) was collected to understand the circulation patterns and hydrography that could influence the biological communities on the seamount. Here, we present the moored ADCP data that was collected to determine currents and sub-surface temperatures. Two ADCP moorings were deployed, one on the northern part and the other on the southern part of Walters Shoal, at depths of 500m, between May 2014 and August 2015. Here we present processed...

DOI: 10.15493/DEA.MIMS.36042025
Short-term observations of daily currents at the Walters Shoal, southwest Indian Ocean at location WSS01 (30 May 2014 - 02 August 2015)

The Walters Shoal project, part of the broader African Coelacanth Ecosystem Programme (ACEP III), conducted an oceanographic and biological survey of the Walters Shoal, a shallow seamount in the southwest Indian Ocean, in order to understand the biodiversity and ecological processes occurring on this unique seamount. The project used a multidisciplinary approach that included the sampling of sponge fauna, fish populations, and oceanographic conditions. Oceanographic data (including moored ADCP data, CTD profiles, as well as underway S-ADCP and TSG data) was collected to understand the circulation patterns and hydrography that could influence the biological communities on the seamount. Here, we present the moored ADCP data that was collected to determine currents and sub-surface temperatures. Two ADCP moorings were deployed, one on the northern part and the other on the southern part of Walters Shoal, at depths of 500m, between May 2014 and August 2015. Here we present processed...

DOI: 10.15493/DEA.MIMS.35042025
Short-term observations of hourly currents at the Walters Shoal, southwest Indian Ocean at location WSS01 (29 May 2014 - 02 August 2015)

The Walters Shoal project, part of the broader African Coelacanth Ecosystem Programme (ACEP III), conducted an oceanographic and biological survey of the Walters Shoal, a shallow seamount in the southwest Indian Ocean, in order to understand the biodiversity and ecological processes occurring on this unique seamount. The project used a multidisciplinary approach that included the sampling of sponge fauna, fish populations, and oceanographic conditions. Oceanographic data (including moored ADCP data, CTD profiles, as well as underway S-ADCP and TSG data) was collected to understand the circulation patterns and hydrography that could influence the biological communities on the seamount. Here, we present the moored ADCP data that was collected to determine currents and sub-surface temperatures. Two ADCP moorings were deployed, one on the northern part and the other on the southern part of Walters Shoal, at depths of 500m, between May 2014 and August 2015. Here we present processed...

DOI: 10.15493/DEA.MIMS.34042025
Short-term observations of daily bottom temperatures at the Walters Shoal, southwest Indian Ocean at location WSN01 (26 May 2014 - 01 August 2015)

The Walters Shoal project, part of the broader African Coelacanth Ecosystem Programme (ACEP III), conducted an oceanographic and biological survey of the Walters Shoal, a shallow seamount in the southwest Indian Ocean, in order to understand the biodiversity and ecological processes occurring on this unique seamount. The project used a multidisciplinary approach that included the sampling of sponge fauna, fish populations, and oceanographic conditions. Oceanographic data (including moored ADCP data, CTD profiles, as well as underway S-ADCP and TSG data) was collected to understand the circulation patterns and hydrography that could influence the biological communities on the seamount. Here, we present the moored ADCP data that was collected to determine currents and sub-surface temperatures. Two ADCP moorings were deployed, one on the northern part and the other on the southern part of Walters Shoal, at depths of 500m, between May 2014 and August 2015. Here we present processed...

296 datasets found Page 1 of 12

Geographic extent

Temporal extent