Resources

RRS Discovery DY116

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY116
Cruise period2020-11-10 — 2020-11-26
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesRRS Discovery cruise 116 departed Southampton 10th November 2020, operated in the Whittard Canyon (12-13th November) and the Porcupine Abyssal Plain Sustained Observatory area (19-23 November), returning to Southampton 26th November 2020.
The goal of the cruise was to continue time-series observations of the surface ocean, water column, and seafloor at the site, as first studied by NOC (then the Institute of Oceanographic Sciences) in 1985. An additional goal was to service a mooring at Whittard Canyon. Operations were limited in scope because of the Covid-19 pandemic which affected all aspects of life in 2020. DY116 was delayed from June/July until November 2020 and proceeded with reduced personnel and limited scope. The specific aims were to recover data and infrastructure and deploy replacement moorings. The regular sampling programme at PAP-SO did not take place because of the need for social distancing. Shortly before departing the PAP1 surface buoy had become detached from the mooring and was recovered by the FS Maria S. Merian.
The PAP1 mooring was successfully deployed including replacement of the full ocean depth mooring. The surface buoy was upgraded to a Met Office Mobilis buoy. The 30 m sensor frame was not included in the first deployment but will return on in 2021. The PAP3 mooring, a sediment trap and current meter string, was successfully recovered and redeployed. Colonisation substrates and larval traps for the on-going LO3CAted (Larval Occurrences in Open Ocean: Connectivity studies in NE Atlantic and Mediterranean Sea) project were recovered from PAP3. The Bathysnap seafloor time-lapse camera, and associated LO3CAted samplers, was recovered but unfortunately it had flooded. A series of water column observation and sampling operations were successfully carried out with a CTD instrument package. The CTD deployments included pre-and post-deployment calibrations of PAP1 and PAP3 sensors. Underway data were collected and a Met Office Biogeochemistry Argo float was deployed. At Whittard Canyon the mooring was successfully recovered and replaced.
This cruise was a contribution to the Climate Linked Atlantic Section Science (CLASS) project supported by the UK Natural Environment Research Council (grant number NE/R015953/1).
Chief scientistAndrew R Gates (National Oceanography Centre, Southampton)
ProjectMarine LTSS: Climate Linked Atlantic Sector Science (CLASS)
Cruise reportRRS Discovery DY116 cruise report dy116.pdf (8.87 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificPorcupine Abyssal Plain, Whittard Canyon
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of track lines = 1
Description: Underway measurements for the duration of the cruise.
CTD stationsQuantity: number of stations = 1
Description: CTD profile in Irish EEZ. Primarily for release test for Whittard Canyon mooring deployment but sensor data collected. No water bottle samples. DY116-001
CTD stationsQuantity: number of stations = 4
Description: CTD profiles at PAP site. 2 x shallow (500 m), 2 x deep (4700 m) Includes release tests for mooring deployments, sensor data and water bottle samples. DY116-003, DY116-005, DY116-012 & DY116-013
Moorings, landers, buoys 
Physical oceanography 
Current meters49° 0' 54" N  16° 26' 30" W — Deployment of PAP-SO sediment trap mooring, 20/11/2020, DY116-007. Inculdes 3 x sediment trap, 1 x current meters and 2 x CTD. DY116-007
Current meters48° 58' 0" N  16° 29' 48" W — Recovery of PAP-SO sediment trap mooring 19/11/2020. Deployed as DY103-009 on 29/06/2019
Current profiler (eg ADCP)48° 37' 36" N  10° 0' 11" W — Recovered a mooring that includes sediment trap, ADCP and in situ CTD sensor at the Whittard Canyon in Irish EEZ. Deployed 08 July 2019, recovered 12 November 2020. Station number DY103-041 Mooring had no surface expression
Current profiler (eg ADCP)48° 37' 36" N  10° 0' 18" W — Deployed a mooring that includes sediment trap, ADCP and in situ CTD sensor at the Whittard Canyon in Irish EEZ 13 November 2020. Station number DY116-002. Mooring has no surface expression.
Chemical oceanography 
Oxygen49° 0' 0" N  16° 30' 6" W — Deployment of Biogeochemistry Argo Float. DY116-006
Oxygen48° 57' 11" N  16° 19' 41" W — Deployed mooring that includes surface Met sensors and CO2 and oceanographic sensors on keel (CTD, Chlorophyll fluorescence, CO, O2). Deployed 21/11/2020 as DY116-008.
Oxygen48° 57' 54" N  16° 29' 48" W — Recovered previously deployed PAP mooring that includes surface buoy and subsurface sensor frame. Full mooring deployed as JC165-058 (04/06/2018), buoy and sensor frame replace in 2019 as DY103-028 (03/07/2019). Buoy was lost to big storm and recovered by German research ship. Rest of mooring recovered on 22/11/2020.
Carbon dioxide48° 57' 11" N  16° 19' 41" W — Deployed mooring that includes surface Met sensors and CO2 and oceanographic sensors on keel (CTD, Chlorophyll fluorescence, CO, O2). Deployed 21/11/2020 as DY116-008.
Carbon dioxide48° 57' 54" N  16° 29' 48" W — Recovered previously deployed PAP mooring that includes surface buoy and subsurface sensor frame. Full mooring deployed as JC165-058 (04/06/2018), buoy and sensor frame replace in 2019 as DY103-028 (03/07/2019). Buoy was lost to big storm and recovered by German research ship. Rest of mooring recovered on 22/11/2020.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)49° 0' 0" N  16° 30' 6" W — Deployment of Biogeochemistry Argo Float. DY116-006
Phytoplankton pigs (eg chlorophyll, fluorescence)48° 57' 11" N  16° 19' 41" W — Deployed mooring that includes surface Met sensors and CO2 and oceanographic sensors on keel (CTD, Chlorophyll fluorescence, CO, O2). Deployed 21/11/2020 as DY116-008.
Phytoplankton pigs (eg chlorophyll, fluorescence)48° 57' 54" N  16° 29' 48" W — Recovered previously deployed PAP mooring that includes surface buoy and subsurface sensor frame. Full mooring deployed as JC165-058 (04/06/2018), buoy and sensor frame replace in 2019 as DY103-028 (03/07/2019). Buoy was lost to big storm and recovered by German research ship. Rest of mooring recovered on 22/11/2020.
Sediment traps48° 37' 36" N  10° 0' 18" W — Deployed a mooring that includes sediment trap, ADCP and in situ CTD sensor at the Whittard Canyon in Irish EEZ 13 November 2020. Station number DY116-002. Mooring has no surface expression.
Sediment traps48° 37' 36" N  10° 0' 11" W — Recovered a mooring that includes sediment trap, ADCP and in situ CTD sensor at the Whittard Canyon in Irish EEZ. Deployed 08 July 2019, recovered 12 November 2020. Station number DY103-041 Mooring had no surface expression
Sediment traps48° 58' 0" N  16° 29' 48" W — Recovery of PAP-SO sediment trap mooring 19/11/2020. Deployed as DY103-009 on 29/06/2019
Sediment traps49° 0' 54" N  16° 26' 30" W — Deployment of PAP-SO sediment trap mooring, 20/11/2020, DY116-007. Inculdes 3 x sediment trap, 1 x current meters and 2 x CTD. DY116-007
Zoobenthos49° 0' 11" N  16° 26' 35" W — Seabed time-lapse camera recovered 19/11/2020, deployed in 06/07/2019 as DY103-039. Camera flooded so no data expected.
Meteorology 
Routine standard measurements48° 57' 11" N  16° 19' 41" W — Deployed mooring that includes surface Met sensors and CO2 and oceanographic sensors on keel (CTD, Chlorophyll fluorescence, CO, O2). Deployed 21/11/2020 as DY116-008.
Routine standard measurements48° 57' 54" N  16° 29' 48" W — Recovered previously deployed PAP mooring that includes surface buoy and subsurface sensor frame. Full mooring deployed as JC165-058 (04/06/2018), buoy and sensor frame replace in 2019 as DY103-028 (03/07/2019). Buoy was lost to big storm and recovered by German research ship. Rest of mooring recovered on 22/11/2020.
Data held at BODC Get data
Series/Profiles 
2  Acoustic current meter
Moored instrument depth
Sound velocity and travel time in the water column
Reference numbers
Date and time
Temperature of the water column
Platform or instrument orientation
Vertical velocity of the water column (currents)
Horizontal velocity of the water column (currents)
Sea level
Moored instrument depth
Sound velocity and travel time in the water column
Reference numbers
Date and time
Temperature of the water column
Platform or instrument orientation
Vertical velocity of the water column (currents)
Horizontal velocity of the water column (currents)
Sea level

BODC idDate/TimeLocationDoc.
20488592020-11-21 02:00:31  — 2021-04-05 02:00:50 49° 0' 54" N  16° 26' 31" W  View metadata report for BODC series reference number 2048859
20488472020-11-21 02:00:31  — 2021-04-05 02:00:49 49° 0' 54" N  16° 26' 31" W  View metadata report for BODC series reference number 2048847
15  Bottle station
Reference numbers
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Quality control flags
Chlorophyll pigment concentrations in water bodies
Reference numbers
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Silicate concentration parameters in the water column
Nitrate concentration parameters in the water column
Quality control flags
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
20517752020-11-23 12:13 49° 0' 2" N  16° 29' 56" W  View metadata report for BODC series reference number 2051775
20517992020-11-20 10:51:30 49° 0' 0" N  16° 29' 59" W  View metadata report for BODC series reference number 2051799
20518552020-11-20 10:51:30 49° 0' 0" N  16° 29' 59" W  View metadata report for BODC series reference number 2051855
20517382020-11-20 10:51:30 49° 0' 0" N  16° 29' 59" W  View metadata report for BODC series reference number 2051738
20517632020-11-23 05:20 49° 0' 0" N  16° 29' 58" W  View metadata report for BODC series reference number 2051763
20518672020-11-22 16:34:30 48° 58' 42" N  16° 24' 33" W  View metadata report for BODC series reference number 2051867
20518802020-11-23 12:13 49° 0' 2" N  16° 29' 56" W  View metadata report for BODC series reference number 2051880
20517512020-11-22 16:34:30 48° 58' 42" N  16° 24' 33" W  View metadata report for BODC series reference number 2051751
20517872020-11-19 04:23 48° 59' 59" N  16° 30' 1" W  View metadata report for BODC series reference number 2051787
20518062020-11-22 16:34:30 48° 58' 42" N  16° 24' 33" W  View metadata report for BODC series reference number 2051806
20518182020-11-23 05:20 49° 0' 0" N  16° 29' 58" W  View metadata report for BODC series reference number 2051818
20518432020-11-19 04:23 48° 59' 59" N  16° 30' 1" W  View metadata report for BODC series reference number 2051843
20517262020-11-19 04:23 48° 59' 59" N  16° 30' 1" W  View metadata report for BODC series reference number 2051726
20518312020-11-23 12:13 49° 0' 2" N  16° 29' 56" W  View metadata report for BODC series reference number 2051831
20518792020-11-23 05:20 49° 0' 0" N  16° 29' 58" W  View metadata report for BODC series reference number 2051879
1  Fluorometers
Reference numbers
Date and time
Chlorophyll pigment concentrations in water bodies
Reference numbers
Date and time
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
20527542020-11-21 13:24:13  — 2021-04-01 13:24:16 48° 58' 3" N  16° 26' 8" W  View metadata report for BODC series reference number 2052754
2  Gas analyser
Reference numbers
Date and time
Metadata parameters
Partial pressure (pCO2) and fugacity (fCO2) of carbon dioxide in the water column
Carbon monoxide and dioxide concentrations in the atmosphere
Reference numbers
Date and time
Metadata parameters
Partial pressure (pCO2) and fugacity (fCO2) of carbon dioxide in the water column
Carbon monoxide and dioxide concentrations in the atmosphere

BODC idDate/TimeLocationDoc.
20488602020-11-21 20:58:05  — 2021-01-23 18:58:12 48° 58' 3" N  16° 26' 8" W  View metadata report for BODC series reference number 2048860
20488722020-11-21 23:26:43  — 2021-01-08 17:29 48° 58' 3" N  16° 26' 8" W  View metadata report for BODC series reference number 2048872
1  In-situ dissolved gas analyser
Reference numbers
Date and time
Temperature of the water column
Dissolved oxygen parameters in the water column
Reference numbers
Date and time
Temperature of the water column
Dissolved oxygen parameters in the water column

BODC idDate/TimeLocationDoc.
20520962020-11-21 12:14:02  — 2021-02-20 01:45:02 48° 58' 3" N  16° 26' 8" W  View metadata report for BODC series reference number 2052096
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

BODC idDate/TimeLocationDoc.
20539782020-11-10 14:05  — 2020-11-26 14:32 48° 18' 43" N  17° 2' 11" W — 50° 54' 22" N  1° 17' 25" W  View metadata report for BODC series reference number 2053978
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

BODC idDate/TimeLocationDoc.
20539662020-11-10 14:05  — 2020-11-26 14:32 48° 18' 43" N  17° 2' 11" W — 50° 54' 22" N  1° 17' 25" W  View metadata report for BODC series reference number 2053966
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

BODC idDate/TimeLocationDoc.
20539912020-11-10 14:05  — 2020-11-26 14:32 48° 18' 43" N  17° 2' 11" W — 50° 54' 22" N  1° 17' 25" W  View metadata report for BODC series reference number 2053991
1  Pumped water sample
Horizontal spatial co-ordinates
Date and time
Chlorophyll pigment concentrations in water bodies
Horizontal spatial co-ordinates
Date and time
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
20518922020-11-11 15:40  — 2020-11-19 17:29 48° 37' 56" N  16° 30' 0" W — 50° 3' 16" N  5° 0' 16" W  View metadata report for BODC series reference number 2051892
Discrete samples 
6  CTD frame plus rosette sampler
2  Instrument mooring
20  Sample taken from ship's non-toxic supply