RRS James Cook JC132
Cruise summary report
| Cruise Info. | |||||||||||||||||
| Ship name (ship code) | RRS James Cook (740H) | ||||||||||||||||
| Cruise identifier | JC132 | ||||||||||||||||
| Cruise period | 2016-01-14 — 2016-02-24 | ||||||||||||||||
| Status | Completed | ||||||||||||||||
| Port of departure | Mindelo, Cape Verde | ||||||||||||||||
| Port of return | Port of Spain, Trinidad and Tobago | ||||||||||||||||
| Purpose | Research | ||||||||||||||||
| Objectives | The primary objective of RRS James Cook cruise JC132 was to acquire the active-source geophysical data and seafloor imagery to complement the passive recordings of microseisms made by 25 ocean-bottom seismographs (OBS) deployed at the 13°20'N oceanic core complex on the Mid-Atlantic Ridge during JC102 and recovered during JC109.
Four main data types were collected during JC132: wide-angle recordings of airgun shots by up to 58 OBS; multichannel seismic (MCS) reflection data recorded by a 3 km streamer and airgun sources; near seafloor magnetic data and seafloor imagery recorded by Autosub. Gravity and swath bathymetry data were also acquired port-to-port. The swath bathymetry data were calibrated with a sound velocity dip undertaken at the lateral centre of the ocean-bottom seismograph grid; in the same location as sampled during JC102 and JC109. Good quality near-seabed bathymetry and magnetic data, and both wide-angle refraction and normal incidence reflection seismic data were acquired throughout the cruise with which to address the science objectives. | ||||||||||||||||
| Chief scientist | Christine Peirce (University of Durham, Department of Earth Sciences), Timothy Reston (University of Birmingham School of Geography, Earth and Environmental Sciences) | ||||||||||||||||
| Project | The Role and Extent of Detachment Faulting at Slow-Spreading Mid-Ocean Ridges | ||||||||||||||||
| Coordinating body | Natural Environment Research Council (NERC) | ||||||||||||||||
| Cruise report |  (130.18 MB) | ||||||||||||||||
| Ocean/sea areas | |||||||||||||||||
| General | North Atlantic Ocean | ||||||||||||||||
| Specific | Central Atlantic | ||||||||||||||||
| Track charts | (0.15 MB) | ||||||||||||||||
| Measurements | |||||||||||||||||
| Physical oceanography | |||||||||||||||||
| Other physical oceanographic measurements | Quantity: number of deployments = 3 Description: Sound velocity / temperature vs depth in three locations. | ||||||||||||||||
| Geology and geophysics | |||||||||||||||||
| Multi-beam echosounding | Quantity: activity duration in days = 42 Description: Swath bathymetry during all seismic profiles and during transit to-from the work area | ||||||||||||||||
| Multichannel seismic reflection | Quantity: number of profiles = 27 Description: Multichannel seismic data between 13 40N - 12 00N; 44 30 - 45 30 W | ||||||||||||||||
| Seismic refraction | Quantity: number of deployments = 68 Description: Ocean bottom seismograph | ||||||||||||||||
| Gravity measurements | Quantity: activity duration in days = 42 Description: Gravity run continuously from Cape Verde to study area to Trinidad | ||||||||||||||||
| Magnetic measurements | Quantity: number of profiles = 1 Description: Magnetics recorded during multichannel seismic profiles (G76) and from AUV (G90) near-seafloor transects | ||||||||||||||||
| Other geological/geophysical measurements | Quantity: number of profiles = 1 Description: Eh, Turbidity, microbathymetry and near seafloor magnetics collected by AUV Autosub 6000 in work area around 13 20'N | ||||||||||||||||
| Data held at BODC | Get data | ||||||||||||||||
| Series/Profiles | |||||||||||||||||
| 1 Meteorological data logger | Visible waveband radiance and irradiance measurements in the atmosphere Horizontal spatial co-ordinates Air pressure Date and time Air temperature Wind strength and direction Solar Radiation Atmospheric humidity Visible waveband radiance and irradiance measurements in the atmosphere Horizontal spatial co-ordinates Air pressure Date and time Air temperature Wind strength and direction Solar Radiation Atmospheric humidity
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| 1 Multiple instrument types | 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 Electrical conductivity of the water column Raw fluorometer output Chlorophyll pigment concentrations in water bodies 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 Electrical conductivity of the water column Raw fluorometer output Chlorophyll pigment concentrations in water bodies
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| 1 Single-beam echosounder | Horizontal spatial co-ordinates Date and time Platform or instrument orientation Horizontal platform movement Bathymetry and Elevation Horizontal spatial co-ordinates Date and time Platform or instrument orientation Horizontal platform movement Bathymetry and Elevation
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| 3 Sound Velocity Probe | Sound velocity and travel time in the water column Reference numbers Vertical spatial coordinates Sound velocity and travel time in the water column Reference numbers Vertical spatial coordinates
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| Discrete samples | |||||||||||||||||
| 3 Sound Velocity Probe |
