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RRS James Cook JC136
Cruise summary report
Cruise Info. | |||||||||
Ship name (ship code) | RRS James Cook (740H) | ||||||||
Cruise identifier | JC136 | ||||||||
Cruise period | 2016-05-14 — 2016-06-23 | ||||||||
Status | Completed | ||||||||
Port of departure | Southampton, United Kingdom | ||||||||
Port of return | Southampton, United Kingdom | ||||||||
Purpose | Research | ||||||||
Objectives | Cruise JC136 is associated with a NERC joint standard research grant (NE/K011855/1 and NE/K013513/1) entitled "Influence of population connectivity on depth-dependent diversity of deep-sea marine benthic biota". The aims of this project are to investigate connectivity among deep-sea populations at different depths and spatial scales using: 1) larval dispersal modelling using Lagrangian particle tracking, driven by hydrographic models, 2) population genetics/genomics and 3) benthic community analysis. The aims of cruise JC136 were then to sample a range of sites and depth bands to:
1. obtain physical samples of 4 model organisms for molecular analysis. 2. gather benthic biological survey data for community level analysis. 3. collect oceanographic data to validate high resolution oceanographic models with which we will model larval dispersal. We visited 5 sites in the NE Atlantic (Rockall Bank, George Bligh Bank, Anton Dohrn Seamount, Wyville-Thomson Ridge, and Rosemary Bank) undertaking 27 ROV dives, 12 AUV missions, 43 CTD casts, 2 mooring deployments and equipment trials. All cruise aims were broadly met. We obtained 3630 biological samples, including sufficient depth and site coverage for molecular analysis of 3 target species. We obtained video transect data with sufficient replication and depth stratification from 3 sites and near complete sampling from a 4th. We obtained sufficient oceanographic data to validate our models. In addition, we gathered 5811.66 km2 of seafloor multibeam to contribute to ongoing efforts to map the North Atlantic, including the first multibeam from the Geike Slide and Hebridean Slope Nature Conservation Marine Protected Area (NCMPA). Poor visitbility at the seabed prevented a planned resurvey of the Darwin Mounds Marine Protected Area (MPA) (see JC60). | ||||||||
Chief scientist | Kerry Howell (University of Plymouth School of Marine Science and Engineering), Michelle L Taylor (University of Oxford Department of Zoology) | ||||||||
Cruise report | (6.30 MB) | ||||||||
Ocean/sea areas | |||||||||
General | North East Atlantic Ocean (limit 40W) | ||||||||
Specific | Northeast Atlantic (Rockall Bank, George Bligh Bank, Anton Dohrn Seamount, Wyville-Thomson Ridge and Rosemary Bank). | ||||||||
Track charts | (0.55 MB) | ||||||||
Measurements | |||||||||
Physical oceanography | |||||||||
CTD stations | Quantity: number of profiles = 43 Description: A CTD Sea-Bird 9plus underwater unit was used that recorded a set of standard parameters of sea water (salinity, temperature, depth) in a binary format. A TRDI WHM 300kHz Lowered Acoustic Doppler Current Profiler (LADCP) was installed in a downward-looking orientation on the CTD frame for measurements of the velocity components. | ||||||||
Biology and fisheries | |||||||||
Other biological/fisheries measurement | Quantity: number of track lines = 42 Description: A total of 42, 750 km long video transects were achieved across five sites using the Isis ROV during the cruise, for the purposes of assessing faunal diversity and community composition. | ||||||||
Other biological/fisheries measurement | Quantity: number of dives = 27 Description: Twenty seven ROV dives were undertaken during the course of the cruise for video transects and biological sample collection. | ||||||||
Other biological/fisheries measurement | Quantity: number of samples = 3630 Description: A total of 3630 biological samples of four target species were collected for molecular analysis. Sufficient depth and site coverage were achieved for 3 of these species. | ||||||||
Geology and geophysics | |||||||||
Bottom photography | Quantity: number of dives = 27 Description: Twenty seven ROV dives were undertaken during the course of the cruise for video transects and biological sample collection. | ||||||||
Bottom photography | Quantity: number of track lines = 42 Description: A total of 42, 750 km long video transects were achieved across five sites using the Isis ROV during the cruise, for the purposes of assessing faunal diversity and community composition. | ||||||||
Bottom photography | Quantity: number of dives = 12 Description: Twelve AUV missions were completed during the cruise to collect multibeam, side scan sonar, and image data. | ||||||||
Multi-beam echosounding | Quantity: track kilometres = 532 Description: Collected using the ship's system EM120, to be processed at BGS, Edinburgh | ||||||||
Multi-beam echosounding | Quantity: survey square kilometres = 5811.66 Description: Multibeam data collected using the ship's systems EM120 (depths greater than 800 m) and EM710 (depths less than 800 m), and the EM2040 on Autosub6000 processed onboard the ship. | ||||||||
Multi-beam echosounding | Quantity: number of dives = 12 Description: Twelve AUV missions were completed during the cruise to collect multibeam, side scan sonar, and image data. | ||||||||
Multi-beam echosounding | Quantity: track kilometres = 83 Description: Collected using the EM2040 on Autosub6000, to be processed at BGS, Edinburgh | ||||||||
Long/short range side scan sonar | Quantity: track kilometres = 89 Description: Side scan and chirp data collected using the EM2040 on Autosub6000, to be processed at BGS, Edinburgh. | ||||||||
Long/short range side scan sonar | Quantity: number of dives = 12 Description: Twelve AUV missions were completed during the cruise to collect multibeam, side scan sonar, and image data. | ||||||||
Moorings, landers, buoys | |||||||||
Physical oceanography | |||||||||
Current profiler (eg ADCP) | 57° 37' 0" N 10° 49' 0" E — Mooring deployed at 1220 m depth. Equipped with upward-looking TRDI 75kHz ADCPs for measurements of current velocities in the whole water column and 300KHz downward-looking ADCP for measurements in the bottom layer. | ||||||||
Current profiler (eg ADCP) | 57° 36' 0" N 10° 49' 59" E — Mooring deployed at 808 m depth. Equipped with upward-looking TRDI 75kHz ADCPs for measurements of current velocities in the whole water column and 300KHz downward-looking ADCP for measurements in the bottom layer. | ||||||||
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
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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
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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 Metadata parameters Raw suspended particulate material concentration sensor output Electrical conductivity of the water column Raw fluorometer 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 Metadata parameters Raw suspended particulate material concentration sensor output Electrical conductivity of the water column Raw fluorometer output Chlorophyll pigment concentrations in water bodies
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Discrete samples | |||||||||
43 CTD frame plus rosette sampler | |||||||||
2 Instrument mooring |