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RRS Discovery DY026B

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY026B
Cruise period2014-08-16 — 2014-08-24
StatusCompleted
Port of departureSouthampton, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesDY026 was funded as part of NERCs Shelf Sea Biogeochemistry (SSB) programme. This programme aims to reduce uncertainly in our process understanding of the cycling of nutrients and carbon, and the controls on primary and secondary production in both the UK and European shelf seas, and in wider global biogeochemical cycles. A series of long-term moorings and gliders were deployed in the Celtic Sea in early 2014 (DY008) and will remain in the water until late summer 2015. They will provide an unprecedented record of both physical and biogeochemical measurements across a full seasonal cycle providing the research community with (a) a long term record of the parameters controlling biogeochemical cycling rates and pathways, (b) a background against which to set process studies carried out on subsequent cruises and (c) essential data for model validation and development.

The main objective of this cruise was to service the moorings. Specifically:
(a) service 8 moorings/landers distributed across 5 different sites in the Celtic Sea
(b) calibrate the moorings

Mooring calibration was achieved via CTD casts pre-recovery and post-deployment. Samples were collected for DIC/TA, DIN, DON, Chl-a, SPM and oxygen. The shipboard CTD winch failed for a part of the cruise so the Cefas ESM2 profiler was deployed instead with water samples collected from the clean lab supply.

Additional CTDs were performed in between the main study sites to build a more complete cross-shelf picture of key biogeochemical and physical gradients (names A1-A5).

Most moorings were deployed on JC105 and were due to be serviced again on CEND22/14 and DY018.
Chief scientistDavid Brian Sivyer (Centre for Environment, Fisheries and Aquaculture Science Lowestoft Laboratory)
ProjectShelf Sea Biogeochemistry
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportRRS Discovery DY026B cruise report dy026.pdf (2.60 MB) 
Ocean/sea areas 
GeneralCeltic Sea
Track chartsRRS Discovery DY026B cruise track — dy026btrk.pdf (0.20 MB) 
Measurements 
Physical oceanography 
Transparency (eg transmissometer)Quantity: number of profiles = 7
Optics (eg underwater light levels)Quantity: number of profiles = 7
Optics (eg underwater light levels)Quantity: number of profiles = 2
Description: CTD profiles (temperature, salinity, pressure, oxygen, optical back scatter (sediment load), chlorophyll fluorescence, PAR/Irradiance)
Other physical oceanographic measurementsQuantity: number of profiles = 7
Chemical oceanography 
OxygenQuantity: number of profiles = 7
OxygenQuantity: number of samples = 21
Description: Dissolved oxygen samples from CTD niskin bottles
OxygenQuantity: number of profiles = 2
Description: CTD profiles (temperature, salinity, pressure, oxygen, optical back scatter (sediment load), chlorophyll fluorescence, PAR/Irradiance)
Carbon dioxideQuantity: activity duration in days = 9
Description: Underway PCO2 analysis
PhosphateQuantity: number of samples = 21
Description: Collection of dissolved inorganic nutrient samples for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate) (from CTD niskin bottles)
PhosphateQuantity: number of samples = 2
Description: Collection of dissolved inorganic nutrient samples from underway non-toxic supply for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate)
NitriteQuantity: number of samples = 21
Description: Collection of dissolved inorganic nutrient samples for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate) (from CTD niskin bottles)
NitriteQuantity: number of samples = 2
Description: Collection of dissolved inorganic nutrient samples from underway non-toxic supply for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate)
Total - NQuantity: number of samples = 21
Description: Collection of dissolved inorganic nutrient samples for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate) (from CTD niskin bottles)
Total - NQuantity: number of samples = 2
Description: Collection of dissolved inorganic nutrient samples from underway non-toxic supply for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate)
SilicateQuantity: number of samples = 21
Description: Collection of dissolved inorganic nutrient samples for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate) (from CTD niskin bottles)
SilicateQuantity: number of samples = 2
Description: Collection of dissolved inorganic nutrient samples from underway non-toxic supply for laboratory analysis (nitrate+nitrite, nitrite, silicate, phosphate)
AlkalinityQuantity: number of samples = 21
Description: Collection of dissolved inorganic carbon and total alkalinity samples for laboratory analysis (from CTD niskin bottles)
AlkalinityQuantity: number of samples = 2
Description: Collection of dissolved inorganic carbon and total alkalinity samples from underway non-toxic supply for laboratory analysis
Other chemical oceanographic measurementsQuantity: number of samples = 21
Description: Collection of dissolved inorganic carbon and total alkalinity samples for laboratory analysis (from CTD niskin bottles)
Other chemical oceanographic measurementsQuantity: number of samples = 2
Description: Collection of dissolved inorganic carbon and total alkalinity samples from underway non-toxic supply for laboratory analysis
Contamination 
Suspended matterQuantity: number of samples = 21
Description: Filtration of samples for laboratory analysis of suspended particulate matter (from CTD niskin bottles)
Suspended matterQuantity: number of profiles = 2
Description: CTD profiles (temperature, salinity, pressure, oxygen, optical back scatter (sediment load), chlorophyll fluorescence, PAR/Irradiance)
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 21
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 7
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 2
Description: CTD profiles (temperature, salinity, pressure, oxygen, optical back scatter (sediment load), chlorophyll fluorescence, PAR/Irradiance)
Dissolved organic matter (inc DOC)Quantity: number of samples = 21
Description: Collection of dissolved organic matter (DOC, DON, DOP) samples for laboratory analysis (from CTD niskin bottles)
Dissolved organic matter (inc DOC)Quantity: number of samples = 2
Description: Collection of dissolved organic matter (DOC, DON, DOP) samples from underway non-toxic supply for laboratory analysis
Moorings, landers, buoys 
Physical oceanography 
Subsurface temperature measurements49° 23' 59" N  8° 35' 59" W — 23 temperature and conductivity loggers (3 x SBE 16 +, 4 x SBE 37, 16 x mini temperature loggers): recovered 21/08/2014, deployed 22/08/2014
Subsurface temperature measurements51° 7' 59" N  6° 33' 59" W — Temperature loggers (SBE56 and SBE39) mounted at 10, 20, 30, 40, 60 and 80 m below surface. Deployed 17/08/2014.
Transparency (eg transmissometer)50° 36' 0" N  7° 1' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Recovered, 19/08/2014, deployed 20/08/2014.
Transparency (eg transmissometer)51° 2' 59" N  6° 35' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered, no new instruments deployed.
Transparency (eg transmissometer)49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa & SBE37), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Recovered 21/08/2014. Deployed 21/08/2014.
Transparency (eg transmissometer)51° 6' 59" N  6° 9' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered.
Transparency (eg transmissometer)51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Deployed 17/08/2014.
Current profiler (eg ADCP)49° 23' 59" N  8° 35' 59" W — 3 x 600 kHz ADCPs mounted inline on mooring wire. Recovered 21/08/2014, deployed 22/08/2014.
Current profiler (eg ADCP)49° 23' 59" N  8° 35' 59" W — 600 kHz ADCP mounted in bedframe (upward looking). Recovered 22/08/2014, deployed 22/08/2014
Current profiler (eg ADCP)49° 23' 59" N  8° 35' 59" W — 150 kHz ADCP mounted in bedframe (upward looking). Recovered 22/08/2014, deployed 22/08/2014
Current profiler (eg ADCP)51° 2' 59" N  6° 35' 59" W — 600 kHz ADCP mounted in minilander (upward looking). Not recovered.
Current profiler (eg ADCP)50° 36' 0" N  7° 1' 59" W — 600 kHz ADCP mounted in minilander (upward looking). Recovered, 19/08/2014, deployed 20/08/2014.
Current profiler (eg ADCP)51° 7' 59" N  6° 33' 59" W — 300 kHz upward looking ADCP mounted inline at approx. 80 m below surface. Deployed 17/08/2014.
Current profiler (eg ADCP)51° 6' 59" N  6° 9' 59" W — 600 kHz ADCP mounted in minilander (upward looking). Not recovered.
Other physical oceanographic measurements51° 2' 59" N  6° 35' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered, no new instruments deployed.
Other physical oceanographic measurements49° 23' 59" N  8° 35' 59" W — Bedframe with SBE 16+ (temperature, pressure, conductivity). Recovered 19/06/2014, deployed 22/06/2014
Other physical oceanographic measurements51° 6' 59" N  6° 9' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered.
Other physical oceanographic measurements50° 36' 0" N  7° 1' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Recovered, 19/08/2014, deployed 20/08/2014.
Chemical oceanography 
Oxygen49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa & SBE37), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Recovered 21/08/2014. Deployed 21/08/2014.
Oxygen51° 2' 59" N  6° 35' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered, no new instruments deployed.
Oxygen50° 36' 0" N  7° 1' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Recovered, 19/08/2014, deployed 20/08/2014.
Oxygen51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Deployed 17/08/2014.
Oxygen51° 6' 59" N  6° 9' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered.
Phosphate49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Recovered 21/08/2014. Deployed 21/06/2014
Phosphate51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Deployed 17/08/2014.
Nitrate51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Deployed 17/08/2014.
Nitrate49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Recovered 21/08/2014. Deployed 21/06/2014
Nitrite49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Recovered 21/08/2014. Deployed 21/06/2014
Nitrite51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Deployed 17/08/2014.
Silicate51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Deployed 17/08/2014.
Silicate49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy mounted 50 port water sampler, 1 m below surface. Recovered 21/08/2014. Deployed 21/06/2014
Other chemical oceanographic measurements51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Deployed 17/08/2014.
Other chemical oceanographic measurements49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa & SBE37), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Recovered 21/08/2014. Deployed 21/08/2014.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa & SBE37), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Recovered 21/08/2014. Deployed 21/08/2014.
Phytoplankton pigs (eg chlorophyll, fluorescence)51° 6' 59" N  6° 9' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered.
Phytoplankton pigs (eg chlorophyll, fluorescence)51° 2' 59" N  6° 35' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Not recovered, no new instruments deployed.
Phytoplankton pigs (eg chlorophyll, fluorescence)51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Deployed 17/08/2014.
Phytoplankton pigs (eg chlorophyll, fluorescence)50° 36' 0" N  7° 1' 59" W — Cefas minilander with temperature and conductivity (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). Recovered, 19/08/2014, deployed 20/08/2014.
Meteorology 
Incident radiation49° 23' 59" N  8° 35' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa & SBE37), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Recovered 21/08/2014. Deployed 21/08/2014.
Incident radiation51° 7' 59" N  6° 33' 59" W — Cefas SmartBuoy with temperature and conductivity logger (Aanderaa), optical backscatter (Seapoint), fluorometer (Seapoint), oxygen sensor (Aanderaa). All approx. 1-2 m below surface. PAR sensor in air (Licor). Deployed 17/08/2014.
Data held at BODC Get data
Discrete samples 
2  Bottom Lander
7  CTD frame plus rosette samplerAmmonium and ammonia concentration parameters in water bodies
Silicate concentration parameters in the water column
Alkalinity, acidity and pH of the water column
Total dissolved inorganic carbon (TCO2) concentration in the water column
Nitrate concentration parameters in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
2  Direct-reading temperature and salinity profiler
3  Drifting Buoy
5  Instrument mooring
7  Sample taken from ship's non-toxic supplyNitrate concentration parameters in the water column
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Silicate concentration parameters in the water column
Alkalinity, acidity and pH of the water column
Total dissolved inorganic carbon (TCO2) concentration in the water column