RRS Discovery DY111
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS Discovery (74EQ) |
| Cruise identifier | DY111 |
| Cruise period | 2019-12-02 — 2020-01-09 |
| Status | Completed |
| Port of departure | Punta Arenas, Chile |
| Port of return | Punta Arenas, Chile |
| Purpose | Research |
| Objectives | CUSTARD - 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 scientist | Adrian P Martin (National Oceanography Centre, Southampton) |
| Cruise report |  (7.70 MB) |
| Ocean/sea areas | |
| General | South 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 stations | Quantity: number of profiles = 65 Description: CTD frame (CTD, transmissometer, fluorometer, optode, optical backscatter, PAR) |
| CTD stations | Quantity: number of profiles = 43 Description: Salinity from CTD niskins |
| 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 | |
| Oxygen | Quantity: number of profiles = 65 Description: Diss. Oxygen from CTD niskins |
| Carbon dioxide | Quantity: activity duration in days = 36 Description: pCO22 from underway |
| Carbon dioxide | Quantity: activity duration in days = 36 Description: DIC from underway |
| Carbon dioxide | Quantity: number of profiles = 43 Description: DIC from CTD niskins |
| Phosphate | Quantity: number of profiles = 65 Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins |
| Nitrate | Quantity: number of profiles = 65 Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins |
| Nitrate | Quantity: activity duration in days = 36 Description: Nitrate from underway |
| Nitrite | Quantity: number of profiles = 65 Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins |
| Silicate | Quantity: number of profiles = 65 Description: Macronutrients (Si(OH)4, NO, PO) from CTD niskins |
| Alkalinity | Quantity: activity duration in days = 36 Description: TA from underway |
| Alkalinity | Quantity: number of profiles = 43 Description: TA from CTD niskins |
| Isotopes | Quantity: number of experiments = 17 Description: 14C from incubations |
| Isotopes | Quantity: number of profiles = 43 Description: Thorium from CTD niskins |
| Isotopes | Quantity: number of profiles = 43 Description: 14C from CTD niskins |
| Isotopes | Quantity: number of experiments = 17 Description: Thorium from SAPS |
| Contamination | |
| Trace metals | Quantity: number of deployments = 22 Description: TM particulates from SAPS |
| Trace metals | Quantity: number of profiles = 22 Description: Diss. And particulate trace metals from CTD niskins |
| Other contaminant measurements | Quantity: number of deployments = 22 Description: Microplastics from SAPS |
| Biology and fisheries | |
| 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: activity duration in days = 36 Description: Fast Repetition Rate Fluorimeter (FRRF3) |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of experiments = 17 Description: Chl-a from incubations |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of profiles = 43 Description: HPCL pigments from CTD niskins |
| 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: activity duration in days = 36 Description: Chl-a from underway |
| 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: PON 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 profiles = 43 Description: PABS 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 = 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: POC 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 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 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 profiles = 43 Description: BSi from CTD niskins |
| Dissolved organic matter (inc DOC) | Quantity: number of profiles = 43 Description: DOC from CTD niskins |
| Phytoplankton | Quantity: number of profiles = 43 Description: Phytoplankton biomass, microscopy from CTD niskins |
| Other biological/fisheries measurement | Quantity: number of deployments = 22 Description: Funghi DNA from SAPS |
| Meteorology | |
| Upper air observations | Quantity: activity duration in days = 36 Description: Underway surface hydrography, meteorology, bathymetry and navigation |
| Incident radiation | Quantity: activity duration in days = 36 Description: Underway surface hydrography, meteorology, bathymetry and navigation |
| Moorings, landers, buoys | |
| Chemical oceanography | |
| Nitrate | 54° 0' 0" S 89° 0' 0" W — OOI surface mooring (data goes live to public domain) augmented with NOC nitrate and silicate sensors |
| Silicate | 54° 0' 0" S 89° 0' 0" W — OOI surface mooring (data goes live to public domain) augmented with NOC nitrate and silicate sensors |