Resources

RRS Discovery DY078 (DY079)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY078 (DY079)
Cruise period2017-05-06 — 2017-05-28
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnReykjavík, Iceland
PurposeResearch
ObjectivesCruise DY078/079 (hereafter called DY078) was the 2017 occupation of the Extended Ellett Line (EEL) and the 2017 refurbishment cruise for the OSNAP Rockall Trough moorings (Overturning in the Subpolar North Atlantic Program).

The core scientific objectives of DY078 were:
To service (recover and re-deploy) the 3 UK OSNAP moorings and 1 ADCP lander in the Rockall Trough (RTWB1, RTWB2, RTEB2 and RTADCP1).
To complete the Extended Ellett Line CTD/LADCP section across the eastern subpolar North Atlantic between Scotland and Iceland via the Rockall-Hatton Plateau.
To collect and freeze nutrient samples from CTD stations for later analysis at SAMS
To deploy four Argos floats for the UK Met Office.
To recover one WHOI OSNAP glider and one SAMS EEL glider.
To deploy one WHOI OSNAP glider and one SAMS OSNAP glider.
To collect water samples for isotopic analysis at Edinburgh and Cardiff Universities
To survey the seabed for sediments with the subbottom profiler.
To collect underway water samples for microplastics analysis
To survey for seabirds and marine mammals
To communicate the cruise work through social media
To collect underwater film footage for an artist

The opportunistic objectives, to be completed if weather conditions allowed were:
To collect megacores for palaeoceanographic and microplastics analysis
To collect water column water samples for microplastics analysis
To collect wind data for air-flow distortion analysis

Most objectives were achieved, including the opportunistic ones, along with 7 extra CTD stations. The only objective not achieved is that the ADCP lander was not recovered, and its replacement was postponed for a later cruise.

All OSNAP moorings were previously deployed in 2014, refurbished in 2015 and 2016, and will be recovered in 2018. The moorings and the CTD profiles will be used to measure the mean and variability of the surface-to-seafloor currents, and to compute the volume, heat and freshwater transport within the currents. They are part of a large international programme, OSNAP (Overturning in the Subpolar North Atlantic Programme) which has other moorings in the Labrador Sea, Irminger Sea and Iceland Basin.
Chief scientistN Penny Holliday (National Oceanography Centre, Southampton)
ProjectUK OSNAP; Extended Ellet Line
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS Discovery DY078 (DY079) cruise report dy078.pdf (30.43 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificIceland Basin, Rockall Trough
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 22
Description: Underway thermosalinograph measurements of sea surface temperature, conductivity, transmittance and fluorescence.
Surface measurements underway (T,S)Quantity: number of stations = 91
Description: Discrete salinity samples taken from underway system intake. Measured on board.
Water bottle stationsQuantity: number of stations = 64
Description: Discrete salinity samples from CTD bottles. Measured on board.
CTD stationsQuantity: number of stations = 81
Description: Standard SBE9/11+ CTD package measuring conductivity, temperature, transmittance and oxygen.
Transparency (eg transmissometer)Quantity: activity duration in days = 22
Description: Underway thermosalinograph measurements of sea surface temperature, conductivity, transmittance and fluorescence.
Transparency (eg transmissometer)Quantity: number of stations = 81
Description: Standard SBE9/11+ CTD package measuring conductivity, temperature, transmittance and oxygen.
Current profiler (eg ADCP)Quantity: activity duration in days = 22
Description: Underway ADCP measurements, 75 kHz system.
Current profiler (eg ADCP)Quantity: activity duration in days = 22
Description: Underway ADCP measurements, 150 kHz system.
Current profiler (eg ADCP)Quantity: number of stations = 81
Description: Downward looking lowered ADCP measurements, Up + down-looking 300kHz system.
Chemical oceanography 
OxygenQuantity: number of stations = 81
Description: Standard SBE9/11+ CTD package measuring conductivity, temperature, transmittance and oxygen.
PhosphateQuantity: number of stations = 72
Description: Discrete nutrient samples taken from CTD bottles. Frozen, to be measured at SAMS.
NitrateQuantity: number of stations = 72
Description: Discrete nutrient samples taken from CTD bottles. Frozen, to be measured at SAMS.
NitriteQuantity: number of stations = 72
Description: Discrete nutrient samples taken from CTD bottles. Frozen, to be measured at SAMS.
SilicateQuantity: number of stations = 72
Description: Discrete nutrient samples taken from CTD bottles. Frozen, to be measured at SAMS.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 81
Description: Standard SBE9/11+ CTD package measuring conductivity, temperature, transmittance and oxygen.
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 22
Description: Underway thermosalinograph measurements of sea surface temperature, conductivity, transmittance and fluorescence.
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 22
Description: Underway meteorology measurements of radiation, air temperature, wind speed and direction, relative humidity and air pressure.
Moorings, landers, buoys 
Physical oceanography 
Current meters57° 6' 1" N  9° 33' 49" W — Mooring RTEB1 deployed on 13/05/2017
Current meters57° 28' 11" N  12° 42' 38" W — UK OSNAP mooring RTWB1 recovered. Water depth 1585m. Current meter, microcat.
Current meters57° 28' 4" N  12° 18' 43" W — UK OSNAP mooring RTWB2 recovered. Water depth 1799m. Current meter, microcat.
Current meters57° 6' 5" N  9° 33' 44" W — UK OSNAP mooring RTEB1 recovered. Water depth 1813m. Current meter, microcat.
Current meters57° 5' 53" N  9° 21' 18" W — UK OSNAP mooring RTADCP1 recovered. Water depth 947m. Current meter, microcat.
Current meters57° 28' 18" N  12° 18' 40" W — Mooring RTWB2 deployed on 11/05/2017
Current meters57° 28' 9" N  12° 42' 20" W — Mooring RTWB1 deployed on 11/05/2017
Neutrally buoyant floats57° 13' 58" N  10° 3' 1" W — Met Office Argo float 8070 deployed on 16/05/2017
Neutrally buoyant floats57° 21' 40" N  10° 21' 40" W — Met Office Argo float 8071 deployed on 17/05/2017
Neutrally buoyant floats59° 24' 1" N  18° 24' 55" W — Met Office Argo float 8073 deployed on 23/05/2017
Neutrally buoyant floats60° 14' 47" N  19° 59' 4" W — Met Office Argo float 8072 deployed on 24/05/2017
Data held at BODC 
Series/Profiles 
72  Acoustic doppler current profiler
Horizontal platform movement
Vertical spatial coordinates
Horizontal velocity of the water column (currents)
Horizontal spatial co-ordinates
Reference numbers
Date and time
Horizontal platform movement
Vertical spatial coordinates
Horizontal velocity of the water column (currents)
Horizontal spatial co-ordinates
Reference numbers
Date and time

BODC idDate/TimeLocationDoc.
18421072017-05-25 08:59:05 61° 29' 59" N  19° 59' 51" W  View metadata report for BODC series reference number 1842107
18421192017-05-25 12:52:51 61° 45' 1" N  19° 59' 57" W  View metadata report for BODC series reference number 1842119
18421202017-05-25 16:14:03 62° 0' 0" N  20° 0' 3" W  View metadata report for BODC series reference number 1842120
18421322017-05-25 20:12:38 62° 20' 2" N  19° 50' 5" W  View metadata report for BODC series reference number 1842132
18421442017-05-26 00:12:24 62° 40' 2" N  19° 40' 11" W  View metadata report for BODC series reference number 1842144
18421562017-05-26 03:35:54 62° 55' 2" N  19° 33' 8" W  View metadata report for BODC series reference number 1842156
18421682017-05-26 08:45:07 63° 7' 58" N  19° 54' 57" W  View metadata report for BODC series reference number 1842168
18421812017-05-26 11:30:02 63° 12' 58" N  20° 3' 57" W  View metadata report for BODC series reference number 1842181
18421932017-05-26 13:45:37 63° 19' 3" N  20° 13' 4" W  View metadata report for BODC series reference number 1842193
18414292017-05-09 06:05:49 56° 40' 32" N  12° 4' 33" W  View metadata report for BODC series reference number 1841429
18414302017-05-09 09:18:11 56° 50' 58" N  12° 5' 41" W  View metadata report for BODC series reference number 1841430
18414422017-05-09 15:57:19 57° 0' 51" N  12° 9' 35" W  View metadata report for BODC series reference number 1841442
18414542017-05-14 08:36:38 56° 40' 3" N  6° 7' 58" W  View metadata report for BODC series reference number 1841454
18414662017-05-14 18:24:53 56° 44' 2" N  7° 9' 59" W  View metadata report for BODC series reference number 1841466
18414782017-05-14 19:38:46 56° 44' 0" N  7° 20' 1" W  View metadata report for BODC series reference number 1841478
18414912017-05-14 21:30:25 56° 43' 59" N  7° 30' 4" W  View metadata report for BODC series reference number 1841491
18415092017-05-15 15:20:41 56° 52' 59" N  8° 29' 59" W  View metadata report for BODC series reference number 1841509
18415102017-05-15 17:37:38 56° 57' 1" N  8° 46' 56" W  View metadata report for BODC series reference number 1841510
18415222017-05-15 19:44:44 57° 0' 4" N  9° 0' 4" W  View metadata report for BODC series reference number 1841522
18415342017-05-15 21:38:35 57° 3' 1" N  9° 13' 1" W  View metadata report for BODC series reference number 1841534
18415462017-05-15 23:26:21 57° 4' 30" N  9° 19' 0" W  View metadata report for BODC series reference number 1841546
18415582017-05-16 01:06:30 57° 6' 3" N  9° 25' 1" W  View metadata report for BODC series reference number 1841558
18415712017-05-16 05:23:46 57° 6' 50" N  9° 35' 30" W  View metadata report for BODC series reference number 1841571
18415832017-05-16 09:07:46 57° 9' 53" N  9° 41' 56" W  View metadata report for BODC series reference number 1841583
18415952017-05-16 13:40:36 57° 13' 59" N  10° 2' 57" W  View metadata report for BODC series reference number 1841595
18416022017-05-17 08:19:38 57° 17' 33" N  10° 22' 18" W  View metadata report for BODC series reference number 1841602
18416142017-05-17 12:30:31 57° 17' 41" N  10° 22' 30" W  View metadata report for BODC series reference number 1841614
18416262017-05-17 16:16:36 57° 21' 52" N  10° 39' 42" W  View metadata report for BODC series reference number 1841626
18416382017-05-17 20:32:32 57° 23' 59" N  10° 51' 59" W  View metadata report for BODC series reference number 1841638
18416512017-05-18 11:47:07 57° 27' 0" N  11° 4' 57" W  View metadata report for BODC series reference number 1841651
18416632017-05-18 13:43:44 57° 28' 3" N  11° 18' 58" W  View metadata report for BODC series reference number 1841663
18416752017-05-18 15:34:20 57° 29' 0" N  11° 31' 53" W  View metadata report for BODC series reference number 1841675
18416872017-05-18 19:05:52 57° 29' 40" N  11° 50' 36" W  View metadata report for BODC series reference number 1841687
18416992017-05-18 22:59:33 57° 30' 28" N  12° 14' 55" W  View metadata report for BODC series reference number 1841699
18417062017-05-19 06:26:17 57° 31' 45" N  12° 37' 35" W  View metadata report for BODC series reference number 1841706
18417182017-05-19 09:57:14 57° 32' 30" N  12° 52' 1" W  View metadata report for BODC series reference number 1841718
18417312017-05-19 12:12:40 57° 32' 59" N  13° 0' 0" W  View metadata report for BODC series reference number 1841731
18417432017-05-19 14:18:23 57° 33' 59" N  13° 19' 56" W  View metadata report for BODC series reference number 1841743
18417552017-05-19 16:19:22 57° 34' 57" N  13° 37' 57" W  View metadata report for BODC series reference number 1841755
18417672017-05-19 18:27:42 57° 39' 59" N  13° 54' 1" W  View metadata report for BODC series reference number 1841767
18417792017-05-19 20:50:41 57° 48' 3" N  14° 15' 1" W  View metadata report for BODC series reference number 1841779
18417802017-05-19 23:24:44 57° 56' 59" N  14° 35' 0" W  View metadata report for BODC series reference number 1841780
18417922017-05-20 02:31:32 58° 4' 18" N  14° 57' 42" W  View metadata report for BODC series reference number 1841792
18418112017-05-20 05:55:05 58° 15' 1" N  15° 20' 8" W  View metadata report for BODC series reference number 1841811
18418232017-05-20 08:52:09 58° 20' 34" N  15° 39' 59" W  View metadata report for BODC series reference number 1841823
18418352017-05-20 13:09:58 58° 33' 55" N  16° 14' 57" W  View metadata report for BODC series reference number 1841835
18418472017-05-20 16:07:49 58° 39' 38" N  16° 30' 6" W  View metadata report for BODC series reference number 1841847
18418592017-05-20 19:23:06 58° 45' 16" N  16° 44' 57" W  View metadata report for BODC series reference number 1841859
18418602017-05-20 22:25:08 58° 52' 58" N  17° 0' 1" W  View metadata report for BODC series reference number 1841860
18418722017-05-21 00:53:09 58° 56' 59" N  17° 11' 0" W  View metadata report for BODC series reference number 1841872
18418842017-05-21 11:06:06 57° 40' 2" N  18° 42' 1" W  View metadata report for BODC series reference number 1841884
18418962017-05-21 14:33:41 57° 42' 51" N  19° 5' 54" W  View metadata report for BODC series reference number 1841896
18419032017-05-21 17:02 57° 45' 40" N  19° 29' 43" W  View metadata report for BODC series reference number 1841903
18419152017-05-21 20:02:01 57° 48' 32" N  19° 53' 34" W  View metadata report for BODC series reference number 1841915
18419272017-05-21 23:46:05 57° 51' 23" N  20° 17' 9" W  View metadata report for BODC series reference number 1841927
18419392017-05-22 03:32:44 57° 54' 27" N  20° 41' 4" W  View metadata report for BODC series reference number 1841939
18419522017-05-23 06:54:06 58° 57' 3" N  17° 10' 45" W  View metadata report for BODC series reference number 1841952
18419642017-05-23 10:25:55 59° 7' 2" N  17° 40' 1" W  View metadata report for BODC series reference number 1841964
18419762017-05-23 12:38:17 59° 12' 1" N  17° 52' 55" W  View metadata report for BODC series reference number 1841976
18419882017-05-23 15:36:10 59° 20' 3" N  18° 13' 50" W  View metadata report for BODC series reference number 1841988
18420032017-05-23 18:12:13 59° 24' 1" N  18° 24' 54" W  View metadata report for BODC series reference number 1842003
18420152017-05-23 23:20:59 59° 40' 1" N  19° 6' 59" W  View metadata report for BODC series reference number 1842015
18419402017-05-22 07:30:43 57° 56' 36" N  21° 5' 2" W  View metadata report for BODC series reference number 1841940
18420272017-05-24 03:40 59° 48' 36" N  19° 29' 57" W  View metadata report for BODC series reference number 1842027
18420392017-05-24 08:22:06 60° 0' 0" N  19° 59' 59" W  View metadata report for BODC series reference number 1842039
18420402017-05-24 12:42:12 60° 14' 56" N  19° 59' 25" W  View metadata report for BODC series reference number 1842040
18420522017-05-24 16:45:11 60° 30' 5" N  19° 59' 58" W  View metadata report for BODC series reference number 1842052
18420642017-05-24 20:54:58 60° 45' 1" N  19° 59' 58" W  View metadata report for BODC series reference number 1842064
18420762017-05-25 00:50:15 61° 0' 4" N  19° 59' 52" W  View metadata report for BODC series reference number 1842076
18420882017-05-25 04:48:14 61° 15' 7" N  20° 0' 2" W  View metadata report for BODC series reference number 1842088
18121732017-05-06 08:11:04  — 2017-05-26 15:00:54 50° 53' 30" N  1° 23' 40" W — 63° 13' 20" N  20° 17' 23" W  View metadata report for BODC series reference number 1812173
18121852017-05-06 08:09:07  — 2017-05-26 14:57:29 50° 53' 30" N  1° 23' 40" W — 63° 13' 20" N  20° 17' 23" W  View metadata report for BODC series reference number 1812185
1  Meteorological data logger
Air pressure
Solar Radiation
Wind strength and direction
Atmospheric humidity
Horizontal spatial co-ordinates
Raw light meter output
Date and time
Air temperature
Visible waveband radiance and irradiance measurements in the atmosphere
Air pressure
Solar Radiation
Wind strength and direction
Atmospheric humidity
Horizontal spatial co-ordinates
Raw light meter output
Date and time
Air temperature
Visible waveband radiance and irradiance measurements in the atmosphere

BODC idDate/TimeLocationDoc.
18170732017-05-06 08:30  — 2017-05-26 23:59 49° 41' 35" N  21° 45' 11" W — 63° 24' 49" N  1° 17' 24" W  View metadata report for BODC series reference number 1817073
1  Multiple instrument types
Raw suspended particulate material concentration sensor output
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Metadata parameters
Raw fluorometer output
Horizontal spatial co-ordinates
Salinity of the water column
Temperature of the water column
Date and time
Raw suspended particulate material concentration sensor output
Transmittance and attenuance of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Metadata parameters
Raw fluorometer output
Horizontal spatial co-ordinates
Salinity of the water column
Temperature of the water column
Date and time

BODC idDate/TimeLocationDoc.
18170852017-05-06 08:30  — 2017-05-26 23:59 49° 41' 35" N  21° 45' 11" W — 63° 24' 49" N  1° 17' 24" W  View metadata report for BODC series reference number 1817085
1  Single-beam echosounder
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
Horizontal spatial co-ordinates
Date and time

BODC idDate/TimeLocationDoc.
18170612017-05-06 08:30  — 2017-05-26 23:59 49° 41' 35" N  21° 45' 11" W — 63° 24' 49" N  1° 17' 24" W  View metadata report for BODC series reference number 1817061
Discrete samples 
81  CTD frame plus rosette sampler
91  Sample taken from ship's non-toxic supply