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RRS Discovery DY088
Cruise summary report
Cruise Info. | |||||||||
Ship name (ship code) | RRS Discovery (74EQ) | ||||||||
Cruise identifier | DY088 | ||||||||
Cruise period | 2018-03-07 — 2018-04-02 | ||||||||
Status | Completed | ||||||||
Port of departure | Punta Arenas, Chile | ||||||||
Port of return | Punta Arenas, Chile | ||||||||
Purpose | Research | ||||||||
Objectives | Determining the tectonic history of the basins and bathymetric highs of the South Scotia Ridge is essential to understand the paleo-current history of cold dense waters which escape the Weddell Sea and connect with the Atlantic Ocean, as well as understanding the pre-break up configuration of the South America - Antarctic Peninsula land bridge and how and when the South Scotia Ridge formed.
Determining the origin of these blocks requires direct sampling by dredging for petrological, geochemical and geochronological study. Discovery Bank was the prime target for dredge sampling followed by Bruce and Pirrie banks. Sampling of sediments deposited on the basement highs for biostratigraphic, petrological and geochemical/isotopic work also has the potential to record past changes in ocean circulation (Antarctic Circumpolar Current influence vs stronger Weddell Sea influence), productivity and sea-ice extent with emphasis on the most recent periods of glacial enhancement of the West Antarctic Ice Sheet and warm interglacials. This work would complement IODP Leg 382, scheduled for 2019, to drill sediments deposited in the basins bordered by Bruce and Pirie banks. Geophysical surveys and direct sampling of sediments of the South Orkney Plateau (SOP) will investigate glacial landforms in troughs that were created by fast-flowing ice during the last glaciation (c. 20 000 years ago). For example, suites of small (<5 m high) moraines, which can only be identified by high-resolution 3D mapping of the seafloor and sub-surface sediments, indicate "episodic" retreat of grounded ice back towards the landmasses. By taking seafloor cores targeted to sample the transition between subglacial and postglacial sediments we can add a chronology of South Orkney ice cap retreat to the record provided by the glacial landforms; longer cores can be used to identify significant climatic/oceanographic changes that may have driven the retreat. | ||||||||
Chief scientist | Teal R Riley (British Antarctic Survey) | ||||||||
Coordinating body | British Antarctic Survey (BAS) | ||||||||
Cruise report | (18.33 MB) | ||||||||
Ocean/sea areas | |||||||||
General | South West Atlantic Ocean (limit 20W) Southern Ocean | ||||||||
Specific | Scotia Sea, Atlantic sector of the Southern Ocean | ||||||||
Track charts | (0.58 MB) | ||||||||
Measurements | |||||||||
Physical oceanography | |||||||||
Other physical oceanographic measurements | Quantity: activity duration in days = 12 Description: Sound velocity probe measurements | ||||||||
Geology and geophysics | |||||||||
Dredge | Quantity: number of stations = 15 Description: Geological dredge sampling | ||||||||
Core - soft bottom | Quantity: number of stations = 32 Description: Gravity and box core sampling | ||||||||
Multi-beam echosounding | Quantity: activity duration in days = 16 Description: EM122/710 swath bathymetry data | ||||||||
Gravity measurements | Quantity: activity duration in days = 16 Description: Gravimeter | ||||||||
Magnetic measurements | Quantity: activity duration in days = 12 Description: Magnetometer deployment | ||||||||
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 Raw light meter output 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 Raw light meter output Solar Radiation Atmospheric humidity
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1 Multi-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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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 Raw suspended particulate material concentration sensor output 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 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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