Cruise inventory

RRS Discovery D302

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD302
Cruise period2006-03-16 — 2006-04-12
StatusCompleted
Port of departureCape Town, South Africa
Port of returnPort Elizabeth, South Africa
PurposeResearch
ObjectivesDiscovery cruises D302 and D301b were a joint expedition between NIOZ and NOC to study the waters flowing to the west and south of Madagascar. The principal objectives of D302 were to :

1. Recover moorings deployed during MadEx (D288)
2. Complete a line of CTD stations across the flow to the south of Madagascar.
3. Examine spatial variability in biology, by taking underway samples for microscopy, HPLC, flow cytometry, and relating those to satellite and shipborne ocean colour measurements.
Chief scientistGraham D Quartly (National Oceanography Centre, Southampton)
ProjectOcean Variability & Climate (OVAC)
Coordinating bodySOC
Cruise reportRRS Discovery D302 cruise report d301b_d302.pdf — access key 'C' (2.47 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
SpecificMozambique Channel
Track chartsRRS Discovery D302 cruise track — d302trk.pdf (00 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 25
Description: Temperature, salinity, fluorescence, transmittance, FRRF
BathythermographQuantity: number of stations = 21
Description: XBTs - 8 x type T5 (reach 1830m) others were T7 (760m)
Water bottle stationsQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
CTD stationsQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
Transparency (eg transmissometer)Quantity: activity duration in days = 25
Description: Temperature, salinity, fluorescence, transmittance, FRRF
Optics (eg underwater light levels)Quantity: activity duration in days = 15
Description: Upward and downward looking hyperspectral radiometers
Instrumented wave measurementsQuantity: activity duration in days = 25
Description: Met obs. from foremast (air temp, irradiance, humidity, wind speed and direction) + SBWR (wave data)
Chemical oceanography 
OxygenQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
PhosphateQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
Total - NQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
SilicateQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: activity duration in days = 10
Description: Underway samples, typically every 4 hours, filtered for HPLC analysis
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
Particulate organic matter (inc POC, PON)Quantity: activity duration in days = 10
Description: Underway samples, typically every 12 hours, filtered for POM analysis
PhytoplanktonQuantity: number of stations = 14
Description: CTD with samples taken for salinity calibration, plus nutrient analysis, Filtration for HPLC analysis and microscopy was only in top 200cm
PhytoplanktonQuantity: activity duration in days = 20
Description: Cell counts of dominant species using flow cytometry (typically every 20 mins)
PhytoplanktonQuantity: activity duration in days = 10
Description: Underway samples, typically every 2 hours, preserved in lugols/formalin
PhytoplanktonQuantity: number of stations = 29
Description: Flow cytometry analysis of all bottles from both D301 and D302 CTD stations
Meteorology 
Incident radiationQuantity: activity duration in days = 25
Description: Met obs. from foremast (air temp, irradiance, humidity, wind speed and direction) + SBWR (wave data)
Routine standard measurementsQuantity: activity duration in days = 25
Description: Met obs. from foremast (air temp, irradiance, humidity, wind speed and direction) + SBWR (wave data)
Moorings, landers, buoys 
Physical oceanography 
Current meters26° 55' 30" S  46° 45' 54" E — ADCP near surface - recovered after ~14 month deployment
Current meters26° 0' 11" S  46° 20' 24" E — ADCP near surface - recovered after ~14 month deployment
Current meters26° 27' 29" S  46° 29' 48" E — ADCP near surface - recovered after ~14 month deployment
Current profiler (eg ADCP)26° 55' 30" S  46° 45' 54" E — ADCP near surface - recovered after ~14 month deployment
Current profiler (eg ADCP)26° 0' 11" S  46° 20' 24" E — ADCP near surface - recovered after ~14 month deployment
Current profiler (eg ADCP)26° 7' 30" S  47° 45' 54" E — McLane moored profiler - recovered after ~14 month deployment: had suffered damage from fishing line after 2 months on site
Surface drifters/drifting buoys25° 56' 42" S  47° 30' 0" E — 4 PODs (Pop-up Ocean Drifters) deployed.