Cruise inventory

RRS Discovery D288 (MadEx)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD288 (MadEx)
Cruise period2005-01-26 — 2005-02-21
StatusCompleted
Port of departureDurban, South Africa
Port of returnDurban, South Africa
PurposeResearch
ObjectivesThe objectives were:
1) To survey the circulation to the south of Madagascar using both SeaSoar for a quasi-synoptic survey of the surface waters, and CTDs for information from deeper waters.
2) To obtain biological samples from this region in order to relate the physics and biology.
3) To place some moorings across the flow in order to record the time-varying currents, and also to deploy some drifters.
A compassionate evacuation to Reunion used up 5 days of time, depriving us of the opportunity to complete the survey work, but allowing an interesting section on the return from Reunion.
Chief scientistGraham D Quartly (Southampton Oceanography Centre)
ProjectOcean Variability and Climate (a NERC Core Strategic programme)
Coordinating bodyNational Oceanography Centre, Southampton
Cruise reportRRS Discovery D288 (MadEx) cruise report d288.pdf — access key 'C' (3.01 MB) 
Ocean/sea areas 
GeneralIndian Ocean
SpecificSouthwestern Indian Ocean
Track chartsRRS Discovery D288 (MadEx) cruise track — d288roscop4743trk.pdf (00 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of samples = 140
Description: 4-hourly samples of salts
Surface measurements underway (T,S)Quantity: activity duration in days = 24
Description: Underway continuous records of surface T & S (good), transmittance and fluorescence (poor)
BathythermographQuantity: number of stations = 13
Description: XBTs
Water bottle stationsQuantity: number of stations = 32
Description: Rosette bottle samples taken for salinity
CTD stationsQuantity: number of stations = 34
Description: Profiles obtained for T, S, Oxygen, Fluorescence and Transmittance
Subsurface temperature and salinity measurementsQuantity: track kilometres = 3290
Description: SeaSoar profiles (T, S, Oxygen, Optical Plankton Counter, FRRF)
Current profiler (eg ADCP)Quantity: number of stations = 33
Description: LADCP profile
Current profiler (eg ADCP)Quantity: activity duration in days = 24
Description: ADCP (75 kHz & 150 kHz)
Instrumented wave measurementsQuantity: activity duration in days = 26
Description: Autoflux (incl. Shipborne Wave recorder)
Chemical oceanography 
OxygenQuantity: track kilometres = 3290
Description: SeaSoar profiles (T, S, Oxygen, Optical Plankton Counter, FRRF)
OxygenQuantity: number of stations = 32
Description: Samples taken for Oxygen, Silicate, Nitrate, Phosphate and Chlorophyll
PhosphateQuantity: number of samples = 500
Description: Samples of nutrients and chlorophyll
PhosphateQuantity: number of stations = 32
Description: Samples taken for Oxygen, Silicate, Nitrate, Phosphate and Chlorophyll
NitrateQuantity: number of stations = 32
Description: Samples taken for Oxygen, Silicate, Nitrate, Phosphate and Chlorophyll
NitrateQuantity: number of samples = 500
Description: Samples of nutrients and chlorophyll
SilicateQuantity: number of stations = 32
Description: Samples taken for Oxygen, Silicate, Nitrate, Phosphate and Chlorophyll
SilicateQuantity: number of samples = 500
Description: Samples of nutrients and chlorophyll
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 32
Description: Samples taken for Oxygen, Silicate, Nitrate, Phosphate and Chlorophyll
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: track kilometres = 3290
Description: SeaSoar profiles (T, S, Oxygen, Optical Plankton Counter, FRRF)
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 500
Description: Samples of nutrients and chlorophyll
PhytoplanktonQuantity: track kilometres = 3290
Description: SeaSoar profiles (T, S, Oxygen, Optical Plankton Counter, FRRF)
PhytoplanktonQuantity: number of samples = 500
Description: Preserved samples (mainly hourly) for subsequent abalysis by flow cytometry
PhytoplanktonQuantity: number of stations = 32
Description: Samples taken for subsequent flow cytometry analysis
ZooplanktonQuantity: track kilometres = 3290
Description: SeaSoar profiles (T, S, Oxygen, Optical Plankton Counter, FRRF)
ZooplanktonQuantity: number of stations = 10
Description: Vertical net hauls from 200m (6 of them repeated from 800m)
Other biological/fisheries measurementQuantity: activity duration in days = 2
Description: Hyperspectral measurements of surface (ocean colour)
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 26
Description: Autoflux (incl. Shipborne Wave recorder)
Moorings, landers, buoys 
Physical oceanography 
Current meters26° 7' 59" S  47° 46' 0" E — MMP (McLane Moored Profiler) plus 1 x (CTD + Current Meter) near surface - deployed 05.02.2005 08:50 GMT
Current meters26° 0' 0" S  46° 21' 0" E — Upward-looking ADCP at 400m, plus 2 x (CTD + Current Meter) -deployed 03.02.2005 12:00 GMT
Current meters26° 25' 0" S  46° 32' 59" E — String of 6 x (CTD + Current Meter) - deployed 10.02.2005 14:40 GMT
Current meters26° 53' 59" S  46° 46' 59" E — Upward-looking ADCP at 400m, plus 2 x (CTD + Current Meter) - deployed 16.02.2005 12:30 GMT
Current profiler (eg ADCP)26° 53' 59" S  46° 46' 59" E — Upward-looking ADCP at 400m, plus 2 x (CTD + Current Meter) - deployed 16.02.2005 12:30 GMT
Current profiler (eg ADCP)26° 0' 0" S  46° 21' 0" E — Upward-looking ADCP at 400m, plus 2 x (CTD + Current Meter) -deployed 03.02.2005 12:00 GMT
Current profiler (eg ADCP)26° 7' 59" S  47° 46' 0" E — MMP (McLane Moored Profiler) plus 1 x (CTD + Current Meter) near surface - deployed 05.02.2005 08:50 GMT
Surface drifters/drifting buoys25° 56' 59" S  47° 30' 0" E — ClearSat drifting buoy (deployed: 04.02.2005 17:30 GMT)
Surface drifters/drifting buoys25° 56' 59" S  47° 30' 0" E — Pop-up Ocean Drifter (POD1) date 04.02.2005 - FAILED
Surface drifters/drifting buoys25° 56' 59" S  47° 30' 0" E — Pop-up Ocean Drifter (POD3) date 04.02.2005 - FAILED
Surface drifters/drifting buoys25° 56' 59" S  47° 30' 0" E — Pop-up Ocean Drifter (POD4) date 04.02.2005 - WORKS
Surface drifters/drifting buoys23° 43' 59" S  50° 4' 59" E — ClearSat drifting buoy (deployed: 15.02.2005 03:40 GMT)
Surface drifters/drifting buoys25° 56' 59" S  47° 30' 0" E — Pop-up Ocean Drifter (POD2) date 04.02.2005 - WORKS