RRS James Cook JC187
Cruise summary report
| Cruise Info. | |||||||||
| Ship name (ship code) | RRS James Cook (740H) | ||||||||
| Cruise identifier | JC187 | ||||||||
| Cruise period | 2019-08-31 — 2019-10-07 | ||||||||
| Status | Completed | ||||||||
| Port of departure | Mindelo, Cape Verde | ||||||||
| Port of return | Walvis Bay, Namibia | ||||||||
| Purpose | Research | ||||||||
| Objectives | Overall Aims
The first overall aim of the project is to understand the speed, frequency, runout distance, and character of turbidity currents within the Congo Canyon. We also seek to understand how turbidity currents form seafloor deposits, and sculpt seabed morphology. This information will help with geohazard assessment and planning of future submarine cable routes across the Congo Canyon. The second overall aim is to determine whether hydrophones or geophones can record turbidity currents, and thus provide information on their frequency, duration or character. A series of subsidiary aims include the following. The third aim is to understand how organic carbon is transferred, fractionated and buried by turbidity currents. The fourth aim is to test whether turbidity currents transport microplastic particles to the deep sea. A final aim is to understand the distribution and abundance of EPS (Extracellular Polymetric Substances) on the canyon floor, which is a sticky substance secreted by organisms that may affect the cohesive properties of the seabed. Brief Narrative Research cruise JC187 was very successful. It deployed 11 acoustic Doppler current profiler (ADCP) moorings, 12 Ocean Bottom Seismometers and a hydrophone array along the Congo Canyon. This comprises 7 ADCP-moorings at 5 sites in the upper canyon, within Angolan waters. A further 4 ADCP-moorings were then deployed at 4 sites within deeper International Waters. A total of 25 mega-cores (~50 cm long that capture the sediment-water interface) and 20 much longer (up to 15 m) piston cores were collected. To help locate moorings, detailed (5-15 m horizontal resolution) bathymetric surveys were completed between all 5 mooring sites in Angolan waters, along a ~70 km length of the canyon. Detailed bathymetry was also collected along the entire canyon length within International Waters. The moorings will now be recovered by a second NERC-funded cruise in Oct-Dec 2020, and we will see whether the ADCPs and other sensors have recorded the frequency, runout and nature of turbidity currents moving down the canyon. | ||||||||
| Chief scientist | Peter J Talling (University of Durham Department of Geography) | ||||||||
| Cruise report |  (27.41 MB) | ||||||||
| Ocean/sea areas | |||||||||
| General | South East Atlantic Ocean (limit 20W) | ||||||||
| Specific | Congo Canyon and channel system | ||||||||
| Measurements | |||||||||
| Physical oceanography | |||||||||
| CTD stations | Quantity: number of profiles = 11 Description: CTD cast and SVP | ||||||||
| Geology and geophysics | |||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 19 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 20 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 21 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 22 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 24 | ||||||||
| Core - soft bottom | Quantity: number of cores = 4 Description: Multicore 25 | ||||||||
| Core - soft bottom | Quantity: number of cores = 20 Description: Piston core | ||||||||
| Core - soft bottom | Quantity: number of cores = 4 Description: Multicore 03 | ||||||||
| Core - soft bottom | Quantity: number of cores = 1 Description: Multicore 23 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 10 | ||||||||
| Core - soft bottom | Quantity: number of cores = 4 Description: Multicore (MC) – 02 | ||||||||
| Core - soft bottom | Quantity: number of cores = 4 Description: Multicore 04 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 05 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 06 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 07 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 08 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 11 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 12 | ||||||||
| Core - soft bottom | Quantity: number of cores = 1 Description: Multicore 13 | ||||||||
| Core - soft bottom | Quantity: number of samples = 5 Description: Multicore 14 Sediment Bags | ||||||||
| Core - soft bottom | Quantity: number of cores = 2 Description: Multicore 15 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 16 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 17 | ||||||||
| Core - soft bottom | Quantity: number of cores = 3 Description: Multicore 18 | ||||||||
| Multi-beam echosounding | Quantity: track kilometres = 415 Description: Multibeam survey of channel in international waters | ||||||||
| Multi-beam echosounding | Quantity: track kilometres = 75 Description: Multibeam survey of upper canyon | ||||||||
| Moorings, landers, buoys | |||||||||
| Physical oceanography | |||||||||
| CTD stations | 5° 57' 12" S 11° 33' 12" E — Mooring 3: CTD and 300 kHz ADCP 65 m ASB deployed 20/09/19 | ||||||||
| CTD stations | 5° 50' 12" S 11° 2' 9" E — Mooring 9: CTD 44 m ASB, 600 kHz ADCP 44 m ASB, CTD 34 m ASB, sediment trap 32 m ASB deployed 21/09/19 | ||||||||
| CTD stations | 5° 45' 24" S 7° 40' 28" E — Mooring 8-R: CTD and 300 kHz ADCP 79 m ASB deployed 02/10/19 | ||||||||
| CTD stations | 6° 41' 45" S 5° 28' 57" E — Mooring 8: CTD and 300 kHz ADCP 79 m ASB deployed 10/09/19 recovered 01/10/2019. | ||||||||
| CTD stations | 6° 27' 51" S 6° 2' 47" E — Mooring 7: CTD 30 m ASB, Sediment trap 23m ASB, CTD and 300 kHz ADCP 79 m ASB deployed 11/09/19 | ||||||||
| CTD stations | 5° 54' 0" S 11° 19' 45" E — IFREMER Aniitra-2 mooring, 75 kHz ADCP 250 m ASB and sediment traop 40 m ASB, deployed 19/09/19 | ||||||||
| CTD stations | 5° 52' 8" S 6° 55' 31" E — Mooring 6: CTD and 300 kHz ADCP 79 m ASB deployed 29/09/19 | ||||||||
| CTD stations | 5° 43' 53" S 8° 7' 18" E — Mooring 5: CTD and 300 kHz ADCP 79 m ASB deployed 28/09/19 | ||||||||
| CTD stations | 5° 55' 27" S 11° 28' 24" E — Mooring 4: CTD and 300 kHz ADCP 65 m ASB deployed 20/09/19 | ||||||||
| CTD stations | 5° 50' 13" S 11° 2' 20" E — Mooring 2: CTD 153 m ASB, 75 kHz ADCP 152 m ASB, CTD 65 m ASB, 300 kHz ADCP 65 m, Hydrophone 50 m ASB deployed 25/09/19 | ||||||||
| CTD stations | 5° 54' 1" S 11° 19' 54" E — Mooring 1: CTD and 300 kHz ADCP 65 m above the seabed (ASB) deployed 19/09/19 | ||||||||
| CTD stations | 5° 52' 44" S 11° 10' 29" E — IFREMER Aniitra-3 mooring, 75 kHz ADCP 250 m ASB and sediment traop 40 m ASB, deployed 21/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 52' 8" S 6° 55' 31" E — Mooring 6: CTD and 300 kHz ADCP 79 m ASB deployed 29/09/19 | ||||||||
| Current profiler (eg ADCP) | 6° 41' 45" S 5° 28' 57" E — Mooring 8: CTD and 300 kHz ADCP 79 m ASB deployed 10/09/19 recovered 01/10/2019. | ||||||||
| Current profiler (eg ADCP) | 5° 43' 53" S 8° 7' 18" E — Mooring 5: CTD and 300 kHz ADCP 79 m ASB deployed 28/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 50' 12" S 11° 2' 9" E — Mooring 9: CTD 44 m ASB, 600 kHz ADCP 44 m ASB, CTD 34 m ASB, sediment trap 32 m ASB deployed 21/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 55' 27" S 11° 28' 24" E — Mooring 4: CTD and 300 kHz ADCP 65 m ASB deployed 20/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 52' 44" S 11° 10' 29" E — IFREMER Aniitra-3 mooring, 75 kHz ADCP 250 m ASB and sediment traop 40 m ASB, deployed 21/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 50' 13" S 11° 2' 20" E — Mooring 2: CTD 153 m ASB, 75 kHz ADCP 152 m ASB, CTD 65 m ASB, 300 kHz ADCP 65 m, Hydrophone 50 m ASB deployed 25/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 57' 12" S 11° 33' 12" E — Mooring 3: CTD and 300 kHz ADCP 65 m ASB deployed 20/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 45' 24" S 7° 40' 28" E — Mooring 8-R: CTD and 300 kHz ADCP 79 m ASB deployed 02/10/19 | ||||||||
| Current profiler (eg ADCP) | 5° 54' 1" S 11° 19' 54" E — Mooring 1: CTD and 300 kHz ADCP 65 m above the seabed (ASB) deployed 19/09/19 | ||||||||
| Current profiler (eg ADCP) | 5° 54' 0" S 11° 19' 45" E — IFREMER Aniitra-2 mooring, 75 kHz ADCP 250 m ASB and sediment traop 40 m ASB, deployed 19/09/19 | ||||||||
| Current profiler (eg ADCP) | 6° 27' 51" S 6° 2' 47" E — Mooring 7: CTD 30 m ASB, Sediment trap 23m ASB, CTD and 300 kHz ADCP 79 m ASB deployed 11/09/19 | ||||||||
| Geology and geophysics | |||||||||
| Geophysical measurements made at depth | 5° 54' 35" S 11° 19' 54" E — OBS-1 (Ocean Bottom Seiesmometers) deployed 19/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 45' 15" S 8° 7' 37" E — OBS-6 deployed 28/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 44' 6" S 7° 37' 58" E — OBS-10 deployed 02/10/2019 | ||||||||
| Geophysical measurements made at depth | 6° 28' 34" S 6° 2' 29" E — German OBS-2 deployed 01/10/2019 | ||||||||
| Geophysical measurements made at depth | 5° 54' 52" S 6° 53' 25" E — OBS-9 deployed 29/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 46' 29" S 7° 16' 8" E — OBS-8 deployed 28/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 45' 52" S 7° 51' 55" E — OBS-7 deployed 28/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 57' 48" S 11° 31' 41" E — OBS-2 deployed 20/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 55' 58" S 11° 27' 16" E — OBS-3 deployed 20/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 54' 29" S 11° 27' 23" E — OBS-4 deployed 20/09/2019 | ||||||||
| Geophysical measurements made at depth | 5° 50' 51" S 11° 1' 52" E — OBS-5 deployed 22/09/2019 | ||||||||
| Geophysical measurements made at depth | 6° 14' 21" S 6° 25' 50" E — German OBS-1 deployed 12/09/2019 | ||||||||
| Other geological/geophysical measurements | 5° 50' 13" S 11° 2' 20" E — Mooring 2: CTD 153 m ASB, 75 kHz ADCP 152 m ASB, CTD 65 m ASB, 300 kHz ADCP 65 m, Hydrophone 50 m ASB deployed 25/09/19 | ||||||||
| Other geological/geophysical measurements | 6° 27' 51" S 6° 2' 47" E — Mooring 7: CTD 30 m ASB, Sediment trap 23m ASB, CTD and 300 kHz ADCP 79 m ASB deployed 11/09/19 | ||||||||
| Other geological/geophysical measurements | 5° 50' 12" S 11° 2' 9" E — Mooring 9: CTD 44 m ASB, 600 kHz ADCP 44 m ASB, CTD 34 m ASB, sediment trap 32 m ASB deployed 21/09/19 | ||||||||
| Other geological/geophysical measurements | 5° 54' 0" S 11° 19' 45" E — IFREMER Aniitra-2 mooring, 75 kHz ADCP 250 m ASB and sediment traop 40 m ASB, deployed 19/09/19 | ||||||||
| Other geological/geophysical measurements | 5° 50' 45" S 11° 1' 33" E — OBIC hydrophone mooring array, 20 hydrophones in vertical array, deployed 22/09/19 | ||||||||
| Other geological/geophysical measurements | 5° 52' 44" S 11° 10' 29" E — IFREMER Aniitra-3 mooring, 75 kHz ADCP 250 m ASB and sediment traop 40 m ASB, deployed 21/09/19 | ||||||||
| Data held at BODC | Get data | ||||||||
| Series/Profiles | |||||||||
| 1 Meteorological data logger | Visible waveband radiance and irradiance measurements in the atmosphere Reference numbers Horizontal spatial co-ordinates Air pressure Date and time Air temperature Wind strength and direction Raw light meter output Solar Radiation Atmospheric humidity Visible waveband radiance and irradiance measurements in the atmosphere Reference numbers Horizontal spatial co-ordinates Air pressure Date and time Air temperature Wind strength and direction Raw light meter output Solar Radiation Atmospheric humidity
| ||||||||
| 1 Multi-beam echosounder | Reference numbers Horizontal spatial co-ordinates Date and time Platform or instrument orientation Horizontal platform movement Bathymetry and Elevation Reference numbers Horizontal spatial co-ordinates Date and time Platform or instrument orientation Horizontal platform movement Bathymetry and Elevation
| ||||||||
| 1 Multiple instrument types | Reference numbers Horizontal spatial co-ordinates Transmittance and attenuance of the water column Date and time Salinity of the water column Temperature of the water column Electrical conductivity of the water column Raw fluorometer output Metadata parameters Raw suspended particulate material concentration sensor output Chlorophyll pigment concentrations in water bodies Reference numbers Horizontal spatial co-ordinates Transmittance and attenuance of the water column Date and time Salinity of the water column Temperature of the water column Electrical conductivity of the water column Raw fluorometer output Metadata parameters Raw suspended particulate material concentration sensor output Chlorophyll pigment concentrations in water bodies
|
