739 datasets found Page 23 of 30
DOI: 10.15493/DEA.MIMS.05202023
Processed CTD continuous observations from the Anchovy and Pilchard Spawning Stock Survey on the Africana Voyage 057, November 1987

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 05 November and 30 November 1987, during the Anchovy and Pilchard Spawning Stock Survey on the Africana Voyage 057, in the southern part of the Agulhas Current Large Marine Ecosystem (ACLME) on the south coast of South Africa and the southern part of the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa. Neil Brown MK3 and MK4 CTD instruments were used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises between 1983 and 2000. The main objective of the cruise was to determine acoustically the biomass of the pilchard and anchovy spawning stocks between Hondeklip Bay and the eastern end of the Agulhas Bank. Additionally, the relationship between the distribution of pelagic fish, their eggs and the water temperature was investigated, and chemical samples were taken along lines of...

(No DOI)
Processed SADCP data from Gough Island Relief / Tristan da Cunha on SA Agulhas II Voyage 009, September 2013

This is processed Shipboard Acoustic Doppler Current Profiler (SADCP) data from the Gough Island Relief / Tristan da Cunha cruise on the SA Agulhas II, Voyage 009 from 5 September to 10 October, 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...

DOI: 10.15493/DEA.MIMS.14072024
Processed CTD discrete observations from the South Coast Demersal Biomass Survey on the Africana Voyage 082, May 1990

Here we present processed Conductivity-Temperature-Depth (CTD) discrete data from the upcast collected between 23 May and 13 June 1990, during voyage 082 on the FRS Africana, in the Agulhas Current Large Marine Ecosystem (ACLME) region on the south coast of Southern Africa. Neil Brown MK3 and MK4 CTD instruments were used to measure pressure, temperature and conductivity through the water column during research and monitoring cruises between 1983 and 2000.

DOI: 10.15493/DEA.MIMS.250121-14
St Helena Bay Monitoring Line (SHBML) on the Algoa Voyage 186, September 2011

This St Helena Bay Monitoring Line (SHBML) cruise was conducted on the Algoa Voyage 186 in August 2011. This is a long-term monitoring line conducted off the coast of Elands/St Helena Bay on the west coast of South Africa. SHBML started in 2000 as a BENEFIT-driven project on "shipboard monitoring" which linked with similar lines run in Namibia and Angola. The aims were to obtain seasonal and interannual information on the hydrology and productivity of the area. It was incorporated under the Integrated Ecosystem Programme: Southern Benguela (IEP:SB) in 2013 consolidating a long-term, multi-decadal time-series (from 1951 onward) of information for this important region and has continued monitoring in the form of the IEP:SB. The programme is a multi-disciplinary, collaborative and capacity building platform undertaking relevant science, including updating technology, with the aim to develop ecosystem indicators that can be used to effectively monitor and understand the Southern...

DOI: 10.15493/dea.mims.26052314
St Helena Bay Monitoring Line (SHBML) on the Algoa Voyage 183, April 2011

This St Helena Bay Monitoring Line (SHBML) cruise was conducted on the Algoa Voyage 183 in April 2011. This is a long-term monitoring line conducted off the coast of Elands/St Helena Bay on the west coast of South Africa. SHBML started in 2000 as a BENEFIT-driven project on "shipboard monitoring" which linked with similar lines run in Namibia and Angola. The aims were to obtain seasonal and interannual information on the hydrology and productivity of the area. It was incorporated under the Integrated Ecosystem Programme: Southern Benguela (IEP:SB) in 2013 consolidating a long-term, multi-decadal time-series (from 1951 onward) of information for this important region and has continued monitoring in the form of the IEP:SB. The programme is a multi-disciplinary, collaborative and capacity building platform undertaking relevant science, including updating technology, with the aim to develop ecosystem indicators that can be used to effectively monitor and understand the Southern...

(No DOI)
Converted XBT data from SANAE on SA Agulhas II Voyage 014, December 2014

The is converted and pre-processed Expendable Bathythermograph (Expendable Bathythermograph (XBT) data from the SANAE on SA Agulhas II Voyage 014, 14 December 2014 and 19 February 2015 with full scientific complement. The South African National Antarctic Expedition (SANAE) is an annual cruise undertaken by the Department of Environmental Affairs (DEA) to change the overwintering teams in Antarctica and to replenish the supplies at the SANAE IV Research base. This voyage was to deliver the SANAE 54 team to the island and return with the SANAE 53 team.

DOI: 10.15493/dea.mims.20210313
Anchovy Assessment Survey on the Africana Voyage 013, November 1983

The Anchovy Assessment Survey was held on the Africana Voyage 013, between the 1st and 29th November 1983. Research was split up into three legs, Leg 1: Cape Town to Port Elizabeth, Leg 2: Port Elizabeth to East London and Leg 3: Olifants River to Cape Agulhas.

DOI: 10.15493/DEA.MIMS.61122022
Processed CTD continuous observations from the Anchovy Spawning Stock Survey on the Africana Voyage 038, November 1985

This is processed downcast Conductivity-Temperature-Depth (CTD) continuous data from the Anchovy Spawning Stock Survey on the Africana Voyage 038, collected between 11 and 29 November 1985. The cruise operated in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa and the Agulhas Current Large Marine Ecosystem (ACLME) on the south coast of South Africa. The objectives of this cruise were to assess the size of the anchovy spawning stock in Cape waters by acoustic survey and estimation of egg production; describe the distribution and behaviour of other pelagic and mesopelagic fish of commercial importance; describe anchovy spawning patterns and estimate the precision of the parameters used in assessing spawning stock size by the egg production method (sex ratio, spawning fraction, fecundity, mean weight); and to investigate relationships between the distribution of pelagic fish, eggs and water temperature.

DOI: 10.15493/DEA.MIMS.01332023
Processed underway Thermosalinograph (TSG) observations from the SAMBA Monitoring Line cruise on the Algoa Voyage 285, September 2022

Here we present the 6-second resolution processed Thermosalinograph (TSG) data collected during the The South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line cruise, which was conducted on the Algoa Voyage 285 between 27 September 2022 and 07 October 2022. A SeaBird SBE45 Thermosalinograph (TSG) is used to opportunistically collect underway near-surface temperature and conductivity measurements during research and monitoring cruises. Water is continuously pumped to the TSG from an intake located in the hull of the vessel, and the observations are continuously interfaced with navigational information. A temperature sensor close to the intake provides temperature measurements of the incoming water (T1). The temperature of the water inside the conductivity cell (T2) is used to accurately compute salinity (S) from the conductivity measurements (C). The cruise operated from Slangkop, off Cape Town, westwards to 11° E, in the South Atlantic Ocean...

(No DOI)
Chl-a data from the Integrated Ecosystem Programme: Southern Benguela (IEP:SB) on Algoa Voyage 248, May 2018

First look at Chl-a data from a survey of West Coast of South Africa, Algoa Voyage V248, as part of the Integrated Ecosystem Programme.

DOI: 10.15493/dea.mims.26500008
Integrated Ecosystem Programme: Southern Benguela (IEP:SB) on the Algoa Voyage 267, November 2019

The Integrated Ecosystem Programme: Southern Benguela (IEP:SB) was conducted on the Algoa Voyage 267, November 2019. Multi-disciplinary, multi-institutional platform to undertake relevant science in the Southern Benguela; also functioning as a platform for collaboration and learning. All projects aim to develop an ecosystem indicator that can be used to effectively monitor and understand the Southern Benguela i.e physical, chemical, planktonic, microbial, seabird and benthic ecosystem indicators, used for ecosystem-based management.

DOI: 10.15493/DEA.MIMS.14652023
Processed Dissolved Inorganic Carbon (DIC) and Total Alkalinity (TA) data from the Integrated Ecosystem Programme: Southern Benguela (IEP:SB) on Algoa Voyage 246, February 2018

This is processed Dissolved Inorganic Carbon (DIC) and Total Alkalinity (TA) data from the Integrated Ecosystem Programme cruise in the Southern Benguela (IEP-SB). The cruise took place from 15 to 22 February 2018 aboard the RV Algoa. A total of 43 stations were occupied along four transect lines on the west coast of South Africa. Nine Conductivity, Temperature, Depth (CTD) stations were occupied along the Kleinsee Monitoring Line (KML) of Kleinsee, ten along the Namaqua Monitoring Line (NML) of Namaqua, twelve stations along the St Helena Bay Monitoring Line (SHBML), two seperate stations in the low oxygen zone in St Helana Bay and ten stations along the Scarborough Monitoring Line (SCL) of Cape Columbine. Discrete water samples were collected in 500ml Certified Reference Materials (CRM) bottles from Niskin bottles and spiked with 0,02% of Mercuric chloride before being stored in the dark at room temperature for later analysis in the laboratory ashore using a Versatile INstrument...

DOI: 10.15493/DEA.MIMS.250121-10
Integrated Ecosystem Programme: Southern Benguela (IEP:SB) on the Algoa Voyage 255, November 2018

This Integrated Ecosystem Programme: Southern Benguela (IEP:SB) cruise was conducted on the Algoa Voyage 255 in November 2018. This is a long-term monitoring line conducted off the coast of Kleinsee, Namaqualand, Elands/St Helena Bay and Scarborough on the west coast of South Africa. The IEP:SB in 2013 consolidated a long-term, multi-decadal time-series (from 1951 onward) of information for this important region and has continued monitoring in the form of the IEP:SB. The programme is a multi-disciplinary, collaborative and capacity building platform undertaking relevant science, including updating technology, with the aim to develop ecosystem indicators that can be used to effectively monitor and understand the Southern Benguela. These include physical, chemical, planktonic, microbial, seabird, marine mammal, benthic and pollution (plastic) ecosystem indicators as required by ecosystem-based management regarding the following priorities: ocean warming, ocean acidification, trophic...

DOI: 10.15493/DEA.MIMS.68122022
Processed CTD discrete observations from the West Coast Hake Biomass on the Africana Voyage 046, July 1986

This is processed Conductivity-Temperature-Depth (CTD) discrete data from the West Coast Hake Biomass on the Africana Voyage 046. The cruise operated in the Benguela Current Large Marine Ecosystem (BCLME) region on the west coast of South Africa. The West Coast Hake Biomass was carried out on the Africana Voyage 046 from 1 to 24 July 1986.

DOI: 10.15493/DEA.MIMS.01132023
South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line cruise on the Algoa Voyage 285, September 2022

The South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA) Monitoring Line in the South-East Atlantic Ocean was conducted on the Algoa Voyage 285 from 27 September to 07 October 2022. The cruise operated from Slangkop, off Cape Town, westwards to 11° E, in the South Atlantic Ocean along the SAMBA transect and south of Hondeklipbaai on the West coast. The objectives of the cruise were to recover an Acoustic Doppler Current Profiler (ADCP) mooring (M4) along the Integrated Ecosystem Programme (IEP)’s Scarborough Monitoring line to collect current data on the Benguela Jet Current; recover 3 x tall moorings on the SAMBA transect (M8; M9 & M10), incorporating ADCP’s and Sea-Bird Microcats; complete 21 Conductivity, Temperature, Depth (CTD) casts to a maximum depth of ~1200m (using Hydro winch) along the SAMBA transect; recover; service and re-deploy 1 TRAFFIC sediment trap mooring (SBUS East-03), south of Hondeklipbaai; undertake Chlorophyll and Oxygen sampling at...

DOI: 10.15493/DEA.MIMS.11552023
Processed CTD continuous observations from the Physical-Chemical Oceanography Cruise on the Africana Voyage 070, March 1989

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 02 and 11 March 1989 during Voyage 070 on the FRS Africana, 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 during research and monitoring cruises between 1983 and 2000. The objectives of the Physical-Chemical Oceanography Cruise were to retrieve six acoustic current meters deployed in September 1988; to recover and redeploy the sequentially sampling sediment trap and the two Anderaa current meters incorporated on the array at a position 90 miles west of Walvis Bay; to repeat a line of CTD stations running at right angles to the shelf from the 4000m Cape Basin station towards Conception Bay; to take size-fractional chlorophyll samples at 3-hourly intervals to calibrate the in-line fluorometer in the hydro...

DOI: 10.15493/DEA.MIMS.01402023
Processed near-surface underway temperature and salinity (TSG) observations from the SEAmester and ASCA Scientific Cruise on the SA Agulhas II Voyage 052, June 2022

Here we present the 6-second resolution processed Thermosalinograph (TSG) data collected on the SEAmester and Agulhas System Climate Array (ASCA) Scientific Cruise on the SA Agulhas II Voyage 052 between 27 June and 07 July 2022. The cruise operated from Cape Town to the ASCA transect (~ 34°S) off Hamburg in the Eastern Cape, South West Indian Ocean. A SeaBird SBE45 Thermosalinograph (TSG) is used to opportunistically collect underway near-surface temperature and conductivity measurements during research and monitoring cruises. Water is continuously pumped to the TSG from an intake located in the hull of the vessel, and the observations are continuously interfaced with navigational information. A temperature sensor close to the intake provides temperature measurements of the incoming water (T1). The temperature of the water inside the conductivity cell (T2) is used to accurately compute salinity (S) from the conductivity measurements (C). The objective of the SEAmester cruise was...

DOI: 10.15493/DEA.MIMS.11822023
Physical-Chemical Oceanography Cruise on the Africana Voyage 070, March 1989

The Physical-Chemical Oceanography Cruise was conducted on the Africana Voyage 070 from 2 - 11 March 1989. The objectives of the cruise were to retrieve six acoustic current meters deployed in September 1988; to recover and redeploy the sequentially sampling sediment trap and the two Anderaa current meters incorporated on the array at a position 90 miles west of Walvis Bay; to repeat a line of Conductivity-Temperature-Depth (CTD) stations running at right angles to the shelf from the 4000m Cape Basin station towards Conception Bay; to take size-fractional chlorophyll samples at 3-hourly intervals to calibrate the in-line fluorometer in the hydro lab; to collect a Pygmy Right Whale for Peter Best and rare sharks for Len Compagno from Walvis Bay and to exchange scientific equipment at Walvis Bay for the SWA (Namibia) section.

(No DOI)
SDS data from the South Coast Moorings and Monitoring Lines Cruise on the Algoa Voyage 213, December 2014

This is Scientific Data System (SDS) data from the South Coast Moorings and Monitoring Lines Cruise on Algoa Voyage 213 on 1 to 19 December, 2014. Between 1988 and 2011, environmental and plankton sampling was conducted every summer along the South Coast during the annual pelagic spawner biomass surveys. Data collected during these cruises has provided valuable insight into environmental change in this region. There has been significant decline in copepod biomass on both the western and central Agulhas Bank over the past two decades, as well as a decline in the proportion of the large dominant species Calanus agulhensis, resulting in a shift towards a smaller copepod-dominated community. These changes are thought to have been largely driven by predation by planktivorous fish, which have increased in biomass since the mid-1990s, but increasing sea temperatures have also played a role. It is vital that we continue to monitor the environment and plankton community in key areas off the...

DOI: 10.15493/DEA.MIMS.03572023
West Coast Hake Biomass Survey on the Africana Voyage 059, February 1988

The main objective of the cruise was to survey by means of trawling the abundance of adult and recruiting hake in South African waters; to investigate the diurnal cycle of hake and other demersal species; to make some experimental trawls in deep water to collect deep-water specimens of fish and squid; to collect routine biological material on demersal species from South West African waters; to investigate the occurence, distribution and abundance of squid and squid larvae; to study demersal community interrelationships and to study the biology of sharks and skates. Oceanographic research assistants were also trained.

DOI: 10.15493/DEA.MIMS.11832023
South-east Atlantic Expedition on the Africana Voyage 071, April 1989

The South-east Atlantic Expedition was conducted on the Africana Voyage 071 from 4 April - 2 May 1989. The South-east Atlantic Expedition had as its main objectives the investigation of the distribution and abundance of phyllosoma larvae of Jasus in the Cape Basin, a comparative study of larval recruitment of Jasus tristani and Jasus lalandii, and the investigation of the circulation in, and ventilation of, the south western Cape Basin. The work was aimed at improving the understanding of the dynamics, in particular recruitment, of rock lobsters in the South-east Atlantic, and at furthering knowledge about some key large scale physical processes which are thought to be important in regulating the distribution and abundance of a number of exploited stocks in the Benguela region.

DOI: 10.15493/DEA.MIMS.11492023
Processed CTD continuous observations from the Physical-Chemical Oceanography Cruise on the Africana Voyage 067, September 1988

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 14 and 30 September 1988 during Voyage 067 on the FRS Africana, 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 during research and monitoring cruises between 1983 and 2000. The Physical-Chemical Oceanography Cruise was divided into two legs with the first leg focusing on physical oceanography and the latter on chemical oceanography. The purpose of the first leg of the cruise was primarily to moor current meters and water-level recorders at various sites, mostly north of the Orange River, and to obtain a precise set of Conductivity-Temperature-Depth (CTD) data on a line running normal to the topography from a point in 4200m of water into Conception Bay. The CTD data will be used to calculate water flux...

DOI: 10.15493/DEA.MIMS.11522023
Processed CTD continuous observations from the West Coast Hake Biomass Survey on the Africana Voyage 069, January 1989

Here we present processed downcast Conductivity-Temperature-Depth (CTD) continuous data collected between 05 and 26 January 1989 during Voyage 069 on the FRS Africana, 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 during research and monitoring cruises between 1983 and 2000. The West Coast Hake Biomass Survey was multi-disciplinary. The main target was to determine, by means of the swept area method, the present status of the hake resource on the South African west coast. In carrying out this study, it was possible also to collect some information on the environment and zooplankton (including squid larvae) in the vicinity of the catches and to determine some ecological interrelationships of hake and other demersal fish species, to investigate squid distribution, to study some aspects of the biology and...

(No DOI)
No Download
Raw CTD data from ACEP Deep Secrets: The Outer Shelf and Slope Ecosystems of the Eastern Cape on the Algoa Voyage 230, September 2016

This is raw Conductivity, Temperature, Depth (CTD) data collected on the ACEP Deep Secrets Cruise which set out to fill in gaps and shed light on the priority areas and research questions identified during the recent Marine Protected Area and Marine Spatial Planning Initiatives of Operation Phakisa’s Marine Protection and Governance Lab. Using underwater cameras (SkiMonkey and Drop camera), grabs, dredges and a CTD the study aimed to improve our knowledge on marine offshore habitats, as well as to build understanding of the effects of the expanding fishing and petroleum industries on marine offshore communities.

DOI: 10.15493/DEA.MIMS.11862023
West Coast Hake Biomass Survey on the Africana Voyage 075, July 1989

The West Coast Hake Biomass Survey on the Africana Voyage 075 was conducted from 14 July - 17 August 1989. The objectives of the cruise were to survey by means of trawling the abundance of adult and recruiting hake in South African waters; to investigate the diurnal cycle of hake and other demersal species; to investigate the environmental and ecological interrelationships of hake and demersal species; to make some experimental trawls in deep water to determine hake distribution limits and to collect deep-water specimens of fish and squid; to collect routine biological material on demersal species from South West African waters; to investigate the occurence, distribution and abundance of squid and squid larvae; to study demersal community interrelationships; to study the biology of sharks and selected non-commercial fish species; to investigate zooplankton scattering layers and their influence on the feeding behaviour of small hake and to extend the primary production data further...

739 datasets found Page 23 of 30

Geographic extent

Temporal extent