Resources

RRS Discovery DY026A

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY026A
Cruise period2014-08-03 — 2014-08-14
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesDY26A formed part of the NERC shelf sea biogeochemistry programme. It had four principal objectives
1. To continue the seasonal time series sampling at three key sites in the Celtic Sea (Shelf break, Candyfloss, Celtic Deep).
2. To provide sampling opportunities for the Shelf sea biogeochemistry students
3. To obtain samples of sinking particulate organic matter at differing stages of the tidal cycle to examine the role of tidal resuspension on elemental cycling beneath the thermocline.
4. To trial autonomous nitrate sensors CTDs and gliders as part of the Sensors on Gliders programme

Objective 1: We conducted CTD casts at each key site, sampling for DIC and nitrate concentrations to evaluate the differential uptake and remineralisation of these tracers which is key to the operation of the shelf sea pump. In addition we made at each site many of the rate measurements the programme needs to make to understand the differential elemental cycling.
Objective 2: Each SSB student got a good range of sampling opportunities at various sites in varying weather conditions.
Objective 3: Following the standard SSB observations outlined in objective 1 we undertook a highly temporally resolved timeseries of observations at the Celtic Deep. This comprised hourly CTDs with very high resolution sampling near the bed coupled to hourly snowcatcher deployments and near bottom respiration, bacterial production and nitrification measurements. Following this we revisited the same site over a tidal cycle and collected near bed suspended material for similar biological rate measurements.
Objective 4: The Sensors on gliders programme has integrated a nitrate sensor into a glider. This combination was trialled at the shelf break and on one further occasion during the cruise. Both deployments produced useful data. In addition the nitrate sensor itself was deployed on the CTD in standalone mode on two occasions with extended bottle stops to allow reliable measurements to be made.
Chief scientistRichard Sanders (National Oceanography Centre, Southampton)
ProjectShelf Sea Biogeochemistry
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS Discovery DY026A cruise report dy026.pdf (2.60 MB)  RRS Discovery DY026A cruise report dy026a.pdf (2.07 MB) 
Ocean/sea areas 
GeneralCeltic Sea
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 33
Description: Temperature and Salinity were measured continuously on 33 CTD stations
Chemical oceanography 
OxygenQuantity: number of stations = 33
Description: Dissolved oxygen, total nitrogen and phosphorus and a range of organic tracers such as amino acids were sampled from 6-10 bottles on 33 CTD casts
Carbon dioxideQuantity: number of samples = 10
Description: Samples for Alkalinity and TCO2 were taken on 10 CTD stations at 6 depths in the vertical.
Other dissolved gasesQuantity: number of stations = 10
Description: Oxygen/ Argon ratios were measured on water from 10 CTD stations.
PhosphateQuantity: number of stations = 33
Description: Inorganic nutrients were measured at 6-10 depths on CTD casts and on experiments undertaken to examine zooplankton metabolism
Total - PQuantity: number of stations = 33
Description: Dissolved oxygen, total nitrogen and phosphorus and a range of organic tracers such as amino acids were sampled from 6-10 bottles on 33 CTD casts
NitrateQuantity: number of stations = 33
Description: Inorganic nutrients were measured at 6-10 depths on CTD casts and on experiments undertaken to examine zooplankton metabolism
NitriteQuantity: number of stations = 33
Description: Inorganic nutrients were measured at 6-10 depths on CTD casts and on experiments undertaken to examine zooplankton metabolism
Total - NQuantity: number of stations = 33
Description: Dissolved oxygen, total nitrogen and phosphorus and a range of organic tracers such as amino acids were sampled from 6-10 bottles on 33 CTD casts
AmmoniaQuantity: number of stations = 33
Description: Inorganic nutrients were measured at 6-10 depths on CTD casts and on experiments undertaken to examine zooplankton metabolism
SilicateQuantity: number of stations = 33
Description: Inorganic nutrients were measured at 6-10 depths on CTD casts and on experiments undertaken to examine zooplankton metabolism
AlkalinityQuantity: number of samples = 10
Description: Samples for Alkalinity and TCO2 were taken on 10 CTD stations at 6 depths in the vertical.
Biology and fisheries 
Primary productivityQuantity: number of stations = 10
Description: Size fractionated Phytoplankton Productivity and Chlorophyll Concentrations were measured on water from 10 CTD stations.
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 10
Description: Size fractionated Phytoplankton Productivity and Chlorophyll Concentrations were measured on water from 10 CTD stations.
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 10
Description: HPLC and Lugols samples were taken from CTD bottles fired in the deep Chlorophyll maxima. Similar observations and samples were made using samples from Marine snowcatchers triggered above and below the thermocline.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 33
Description: Dissolved oxygen, total nitrogen and phosphorus and a range of organic tracers such as amino acids were sampled from 6-10 bottles on 33 CTD casts
Dissolved organic matter (inc DOC)Quantity: number of stations = 33
Description: Dissolved oxygen, total nitrogen and phosphorus and a range of organic tracers such as amino acids were sampled from 6-10 bottles on 33 CTD casts
Biochemical measurements (eg lipids, amino acids)Quantity: number of stations = 33
Description: Dissolved oxygen, total nitrogen and phosphorus and a range of organic tracers such as amino acids were sampled from 6-10 bottles on 33 CTD casts
ZooplanktonQuantity: number of hauls = 52
Description: Net hauls were undertaken on 52 Occasions. Samples were vertically resolved, collected at day and night and size segregated (>63 microns and >200 microns)
ZooplanktonQuantity: number of samples = 10
Description: HPLC and Lugols samples were taken from CTD bottles fired in the deep Chlorophyll maxima. Similar observations and samples were made using samples from Marine snowcatchers triggered above and below the thermocline.
Pelagic bacteria/micro-organismsQuantity: number of measurements = 10
Description: Bacterial Production measurements were made on water collected using CTD samplers and Marine Snowcatchers.
Other biological/fisheries measurementQuantity: number of measurements = 10
Description: Respiration measurements were made on water collected using CTD samplers and Marine Snowcatchers.
Other biological/fisheries measurementQuantity: number of deployments = 43
Description: 43 deployments of marine snowcatchers were undertaken
Other biological/fisheries measurementQuantity: number of measurements = 10
Description: Ammonification and Nitrification measurements were made on water collected using CTD samplers and Marine Snowcatchers.
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 15
Description: A NIOZ box corer was used on 15 occasions. Experimental work on ammonium release was undertaken and samples preserved.
Moorings, landers, buoys 
Physical oceanography 
Other physical oceanographic measurements51° 12' 34" N  6° 8' 31" W — Deployment and recovery of glider with nitrate sensor
Other physical oceanographic measurements48° 20' 27" N  9° 43' 8" W — Deployment and recovery of glider with nitrate sensor
Data held at BODC Get data
Series/Profiles 
39  Bottle station
Reference numbers
Total dissolved inorganic carbon (TCO2) concentration in the water column
Nitrite concentration parameters in the water column
Vertical spatial coordinates
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Quality control flags
Alkalinity, acidity and pH of the water column
Reference numbers
Total dissolved inorganic carbon (TCO2) concentration in the water column
Nitrite concentration parameters in the water column
Vertical spatial coordinates
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Quality control flags
Alkalinity, acidity and pH of the water column

BODC idDate/TimeLocationDoc.
21181712014-08-09 10:54 51° 7' 10" N  6° 37' 22" W  View metadata report for BODC series reference number 2118171
21276842014-08-10 15:19 51° 8' 44" N  6° 36' 21" W  View metadata report for BODC series reference number 2127684
21276602014-08-10 13:09 51° 8' 46" N  6° 36' 20" W  View metadata report for BODC series reference number 2127660
21275552014-08-09 06:21:30 51° 8' 15" N  6° 35' 8" W  View metadata report for BODC series reference number 2127555
21275672014-08-09 10:54 51° 7' 10" N  6° 37' 22" W  View metadata report for BODC series reference number 2127567
21276352014-08-10 10:08:30 51° 9' 6" N  6° 35' 31" W  View metadata report for BODC series reference number 2127635
21274992014-08-06 10:19 48° 20' 17" N  9° 43' 37" W  View metadata report for BODC series reference number 2127499
21277032014-08-10 17:12:30 51° 8' 44" N  6° 36' 14" W  View metadata report for BODC series reference number 2127703
21277392014-08-11 11:14:30 51° 12' 42" N  6° 8' 29" W  View metadata report for BODC series reference number 2127739
21277402014-08-12 07:10:30 51° 8' 54" N  6° 36' 14" W  View metadata report for BODC series reference number 2127740
21181832014-08-10 11:14 51° 8' 56" N  6° 35' 59" W  View metadata report for BODC series reference number 2118183
21274632014-08-05 05:34 49° 23' 11" N  8° 37' 7" W  View metadata report for BODC series reference number 2127463
21181952014-08-12 11:14 51° 8' 22" N  6° 37' 21" W  View metadata report for BODC series reference number 2118195
21275802014-08-09 16:20:30 51° 7' 5" N  6° 37' 29" W  View metadata report for BODC series reference number 2127580
21276962014-08-10 16:17 51° 8' 44" N  6° 36' 15" W  View metadata report for BODC series reference number 2127696
21277522014-08-12 11:14 51° 8' 22" N  6° 37' 21" W  View metadata report for BODC series reference number 2127752
21182022014-08-13 11:14 51° 12' 34" N  6° 3' 21" W  View metadata report for BODC series reference number 2118202
21275062014-08-07 06:20 48° 34' 11" N  9° 30' 36" W  View metadata report for BODC series reference number 2127506
21275432014-08-08 11:19 50° 15' 29" N  7° 44' 36" W  View metadata report for BODC series reference number 2127543
21275792014-08-09 14:30 51° 7' 5" N  6° 37' 29" W  View metadata report for BODC series reference number 2127579
21276722014-08-10 14:10 51° 8' 44" N  6° 36' 23" W  View metadata report for BODC series reference number 2127672
21181102014-08-04 11:40 49° 48' 48" N  5° 28' 39" W  View metadata report for BODC series reference number 2118110
21274512014-08-04 11:40 49° 48' 48" N  5° 28' 39" W  View metadata report for BODC series reference number 2127451
21274752014-08-05 11:19:30 49° 23' 0" N  8° 36' 40" W  View metadata report for BODC series reference number 2127475
21274872014-08-05 17:22 49° 22' 18" N  8° 36' 27" W  View metadata report for BODC series reference number 2127487
21275922014-08-10 07:10:30 51° 9' 25" N  6° 34' 15" W  View metadata report for BODC series reference number 2127592
21276592014-08-10 12:10 51° 8' 50" N  6° 36' 13" W  View metadata report for BODC series reference number 2127659
21277642014-08-13 11:14 51° 12' 34" N  6° 3' 21" W  View metadata report for BODC series reference number 2127764
21181342014-08-06 10:19 48° 20' 17" N  9° 43' 37" W  View metadata report for BODC series reference number 2118134
21181582014-08-08 11:19 50° 15' 29" N  7° 44' 36" W  View metadata report for BODC series reference number 2118158
21275182014-08-07 11:29:30 48° 34' 35" N  9° 30' 55" W  View metadata report for BODC series reference number 2127518
21181222014-08-05 11:19:30 49° 23' 0" N  8° 36' 40" W  View metadata report for BODC series reference number 2118122
21275312014-08-07 15:17 48° 34' 15" N  9° 30' 16" W  View metadata report for BODC series reference number 2127531
21276112014-08-10 08:15 51° 9' 23" N  6° 34' 22" W  View metadata report for BODC series reference number 2127611
21276232014-08-10 09:10 51° 9' 18" N  6° 34' 42" W  View metadata report for BODC series reference number 2127623
21277272014-08-10 19:15 51° 8' 44" N  6° 36' 14" W  View metadata report for BODC series reference number 2127727
21181462014-08-07 11:29:30 48° 34' 35" N  9° 30' 55" W  View metadata report for BODC series reference number 2118146
21276472014-08-10 11:14 51° 8' 56" N  6° 35' 59" W  View metadata report for BODC series reference number 2127647
21277152014-08-10 18:09:30 51° 8' 44" N  6° 36' 14" W  View metadata report for BODC series reference number 2127715
33  CTD/STD cast
Reference numbers
Transmittance and attenuance of the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Optical backscatter
Salinity of the water column
Temperature of the water column
Visible waveband radiance and irradiance measurements in the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies
Reference numbers
Transmittance and attenuance of the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Optical backscatter
Salinity of the water column
Temperature of the water column
Visible waveband radiance and irradiance measurements in the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
13730332014-08-05 16:10 49° 22' 18" N  8° 36' 28" W  View metadata report for BODC series reference number 1373033
13732422014-08-10 17:57 51° 8' 44" N  6° 36' 15" W  View metadata report for BODC series reference number 1373242
13732912014-08-12 07:00 51° 8' 54" N  6° 36' 15" W  View metadata report for BODC series reference number 1373291
13730452014-08-06 08:23 48° 20' 17" N  9° 43' 37" W  View metadata report for BODC series reference number 1373045
13732542014-08-10 19:06 51° 8' 44" N  6° 36' 15" W  View metadata report for BODC series reference number 1373254
13729942014-08-04 11:21 49° 48' 47" N  5° 28' 39" W  View metadata report for BODC series reference number 1372994
13730212014-08-05 11:03 49° 22' 59" N  8° 36' 42" W  View metadata report for BODC series reference number 1373021
13730692014-08-07 11:10 48° 34' 34" N  9° 30' 58" W  View metadata report for BODC series reference number 1373069
13731012014-08-09 10:40 51° 7' 14" N  6° 37' 18" W  View metadata report for BODC series reference number 1373101
13731132014-08-09 13:30 51° 7' 5" N  6° 37' 31" W  View metadata report for BODC series reference number 1373113
13731862014-08-10 12:04 51° 8' 51" N  6° 36' 11" W  View metadata report for BODC series reference number 1373186
13732052014-08-10 13:59 51° 8' 44" N  6° 36' 24" W  View metadata report for BODC series reference number 1373205
13733102014-08-12 13:26 51° 8' 13" N  6° 37' 46" W  View metadata report for BODC series reference number 1373310
13730572014-08-07 06:04 48° 34' 12" N  9° 30' 35" W  View metadata report for BODC series reference number 1373057
13731372014-08-10 06:58 51° 9' 25" N  6° 34' 16" W  View metadata report for BODC series reference number 1373137
13731502014-08-10 08:59 51° 9' 20" N  6° 34' 38" W  View metadata report for BODC series reference number 1373150
13732292014-08-10 16:10 51° 8' 44" N  6° 36' 19" W  View metadata report for BODC series reference number 1373229
13732662014-08-11 10:58 51° 12' 42" N  6° 8' 30" W  View metadata report for BODC series reference number 1373266
13733092014-08-12 11:00 51° 8' 23" N  6° 37' 19" W  View metadata report for BODC series reference number 1373309
13730702014-08-07 15:00 48° 34' 18" N  9° 30' 18" W  View metadata report for BODC series reference number 1373070
13731622014-08-10 10:00 51° 9' 10" N  6° 35' 22" W  View metadata report for BODC series reference number 1373162
13731982014-08-10 12:59 51° 8' 48" N  6° 36' 19" W  View metadata report for BODC series reference number 1373198
13733342014-08-13 11:00 51° 12' 34" N  6° 3' 21" W  View metadata report for BODC series reference number 1373334
13731252014-08-09 16:04 51° 7' 5" N  6° 37' 31" W  View metadata report for BODC series reference number 1373125
13731742014-08-10 11:03 51° 8' 58" N  6° 35' 54" W  View metadata report for BODC series reference number 1373174
13730082014-08-05 05:10 49° 23' 10" N  8° 37' 7" W  View metadata report for BODC series reference number 1373008
13731492014-08-10 08:00 51° 9' 22" N  6° 34' 31" W  View metadata report for BODC series reference number 1373149
13732172014-08-10 15:08 51° 8' 44" N  6° 36' 24" W  View metadata report for BODC series reference number 1373217
13732302014-08-10 17:00 51° 8' 44" N  6° 36' 15" W  View metadata report for BODC series reference number 1373230
13732782014-08-11 14:01 51° 12' 19" N  6° 8' 30" W  View metadata report for BODC series reference number 1373278
13733222014-08-12 18:00 51° 8' 5" N  6° 37' 59" W  View metadata report for BODC series reference number 1373322
13730822014-08-08 11:05 50° 15' 28" N  7° 44' 37" W  View metadata report for BODC series reference number 1373082
13730942014-08-09 06:08 51° 8' 15" N  6° 35' 9" W  View metadata report for BODC series reference number 1373094
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

BODC idDate/TimeLocationDoc.
17598922014-08-03 13:11:12  — 2014-08-14 19:07:42 48° 12' 33" N  9° 53' 7" W — 51° 19' 16" N  1° 17' 20" W  View metadata report for BODC series reference number 1759892
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
Electrical conductivity of the water column
Raw fluorometer output
Metadata parameters
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
Electrical conductivity of the water column
Raw fluorometer output
Metadata parameters
Chlorophyll pigment concentrations in water bodies

BODC idDate/TimeLocationDoc.
17598802014-08-03 13:11:12  — 2014-08-14 19:07:42 48° 12' 33" N  9° 53' 7" W — 51° 19' 16" N  1° 17' 20" W  View metadata report for BODC series reference number 1759880
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

BODC idDate/TimeLocationDoc.
17599112014-08-03 13:11:12  — 2014-08-14 19:07:42 48° 12' 33" N  9° 53' 7" W — 51° 19' 16" N  1° 17' 20" W  View metadata report for BODC series reference number 1759911
Discrete samples 
2  Autonomous Underwater Vehicle deployment
14  Box core
33  CTD frame plus rosette samplerTotal dissolved inorganic carbon (TCO2) concentration in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Salinity of the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Alkalinity, acidity and pH of the water column
10  Drifting Buoy
44  Marine snow catcher
4  Stand-alone pumps
51  Unspecified zooplankton net or nets