Resources

RRS Discovery DY111

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY111
Cruise period2019-12-02 — 2020-01-09
StatusCompleted
Port of departurePunta Arenas, Chile
Port of returnPunta Arenas, Chile
PurposeResearch
ObjectivesCUSTARD - Carbon Uptake and Seasonal Traits of Antarctic Remineralisation Depth. The CUSTARD project examines how seasonal changes in nutrient availability for phytoplankton, at a key junction of the global ocean circulation, influence how long carbon is trapped in the ocean rather than escaping to the atmosphere as carbon dioxide. DY111 was a process cruise immediately prior to the mooring recovery cruise, to allow a more detailed study of the biogeochemistry of the site at the key spring bloom period.

Objectives
1. Deploy two other gliders (just for the duration of the cruise)
2. Deploy 6 BGC ARGO floats on behalf of the SOCCOM project
3. Make multiple visits to 3 sites along 89 W (OOI, TN at 57S and TS at 60S)
4. Carry out a full depth CTD transect between OOI and TS at 1 degree latitude resolution.

All objectives were met, though one glider had to be recovered immediately after deployment due to a leak. Additionally, a modest spatial survey was carried out collecting underway data and samples along a grid-pattern extending 90km west of 89W, to assess upstream properties and gradients.
Chief scientistAdrian P Martin (National Oceanography Centre, Southampton)
Cruise reportRRS Discovery DY111 cruise report dy111.pdf (7.70 MB) 
Ocean/sea areas 
GeneralSouth East Pacific Ocean (limit 140W)
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 36
Description: Underway surface hydrography, meteorology, bathymetry and navigation
Surface measurements underway (T,S)Quantity: activity duration in days = 36
Description: Salinity from underway
CTD stationsQuantity: number of profiles = 43
Description: Salinity from CTD niskins
CTD stationsQuantity: number of profiles = 65
Description: CTD frame (CTD, transmissometer, fluorometer, optode, optical backscatter, PAR)
Optics (eg underwater light levels)Quantity: number of profiles = 43
Description: vLight absorption from CTD niskins
Current profiler (eg ADCP)Quantity: activity duration in days = 36
Description: VMADCP
Chemical oceanography 
OxygenQuantity: number of profiles = 65
Description: Diss. Oxygen from CTD niskins
Carbon dioxideQuantity: number of profiles = 43
Description: DIC from CTD niskins
Carbon dioxideQuantity: activity duration in days = 36
Description: DIC from underway
Carbon dioxideQuantity: activity duration in days = 36
Description: pCO22 from underway
PhosphateQuantity: number of profiles = 65
Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins
NitrateQuantity: number of profiles = 65
Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins
NitrateQuantity: activity duration in days = 36
Description: Nitrate from underway
NitriteQuantity: number of profiles = 65
Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins
SilicateQuantity: number of profiles = 65
Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins
AlkalinityQuantity: number of profiles = 43
Description: TA from CTD niskins
AlkalinityQuantity: activity duration in days = 36
Description: TA from underway
IsotopesQuantity: number of profiles = 43
Description: Thorium from CTD niskins
IsotopesQuantity: number of experiments = 17
Description: 14C from incubations
IsotopesQuantity: number of profiles = 43
Description: 14C from CTD niskins
IsotopesQuantity: number of experiments = 17
Description: Thorium from SAPS
Contamination 
Trace metalsQuantity: number of deployments = 22
Description: TM particulates from SAPS
Trace metalsQuantity: number of profiles = 22
Description: Diss. And particulate trace metals from CTD niskins
Other contaminant measurementsQuantity: number of deployments = 22
Description: Microplastics from SAPS
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of deployments = 22
Description: Chl from Marine Snow Catcher
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 43
Description: Chl-a from CTD niskins
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 43
Description: HPCL pigments from CTD niskins
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 36
Description: Chl-a from underway
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 36
Description: Fast Repetition Rate Fluorimeter (FRRF3)
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of profiles = 65
Description: CTD frame (CTD, transmissometer, fluorometer, optode, optical backscatter, PAR)
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of experiments = 17
Description: Chl-a from incubations
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 22
Description: TM particulates from SAPS
Particulate organic matter (inc POC, PON)Quantity: number of experiments = 17
Description: PABS from incubations
Particulate organic matter (inc POC, PON)Quantity: number of experiments = 17
Description: PON from incubations
Particulate organic matter (inc POC, PON)Quantity: number of experiments = 17
Description: POC from incubations
Particulate organic matter (inc POC, PON)Quantity: number of experiments = 17
Description: Bsi from incubations
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 43
Description: PABS from CTD niskins
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 43
Description: POC from CTD niskins
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 65
Description: Underwater Vision Profiler (UVP) [CTD frame]
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 65
Description: CTD frame (CTD, transmissometer, fluorometer, optode, optical backscatter, PAR)
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 43
Description: BSi from CTD niskins
Particulate organic matter (inc POC, PON)Quantity: number of profiles = 43
Description: PON from CTD niskins
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 25
Description: Red Camera Frame
Particulate organic matter (inc POC, PON)Quantity: number of experiments = 17
Description: BSi, POC from SAPS
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 22
Description: Calcite from Marine Snow Catcher
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 22
Description: Bsi from Marine Snow Catcher
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 22
Description: POC from Marine Snow Catcher
Particulate organic matter (inc POC, PON)Quantity: number of deployments = 22
Description: PON from Marine Snow Catcher
Dissolved organic matter (inc DOC)Quantity: number of profiles = 43
Description: DOC from CTD niskins
PhytoplanktonQuantity: number of profiles = 43
Description: Phytoplankton biomass, microscopy from CTD niskins
Other biological/fisheries measurementQuantity: number of deployments = 22
Description: Funghi DNA from SAPS
Meteorology 
Upper air observationsQuantity: activity duration in days = 36
Description: Underway surface hydrography, meteorology, bathymetry and navigation
Incident radiationQuantity: activity duration in days = 36
Description: Underway surface hydrography, meteorology, bathymetry and navigation
Moorings, landers, buoys 
Chemical oceanography 
Nitrate54° 0' 0" S  89° 0' 0" W — OOI surface mooring (data goes live to public domain) augmented with NOC nitrate and silicate sensors
Silicate54° 0' 0" S  89° 0' 0" W — OOI surface mooring (data goes live to public domain) augmented with NOC nitrate and silicate sensors
Data held at BODC 
Discrete samples 
26  CTD frame plus rosette sampler
141  Sample taken from ship's non-toxic supply
20