Cruise inventory

RRS Discovery D291B

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD291B
Cruise period2005-03-23 — 2005-04-10
StatusCompleted
Port of departureDurban, South Africa
Port of returnCape Town, South Africa
PurposeResearch
ObjectivesOur objectives were threefold:
1) To obtain full-depth CTD casts at 16 mooring sites for calibration of the mooring instrumentation
2) To recover the moorings, which had been deployed in 2003
3) To obtain additional mesoscale survey data that will help us interpret the mooring data
We began our cruise at the southern edge of the Agulhas Current on the heels of cruise D290B, making our first observation at approximately 34° 46.5427'S, 25° 32.2214'E. A successful XBT transect of the Agulhas Current and Agulhas Return Current (approximately 48 hrs in duration) was obtained despite unsatisfactory performance from a box of XCTDs. This transect took us southwest to 40° 51.2069'S, 21° 29.5954'E. Rough weather lost us a bit of time in transit to our next leg, however we still managed to obtain a very interesting feature survey of a recently shed Agulhas Ring as we steamed westward toward our moorings. This leg lasted approximately 3 days. Our southernmost mooring was located at: 39° 14.4413'S 11° 18.8885'E and once we reached it we followed the feature survey with a mixed mooring calibration/recovery leg which lasted approximately 8 days. No major problems were encountered and all gear was recovered successfully. In the middle of this leg a second small feature survey was undertaken which lasted approximately 28 hours. After the mooring recoveries, the last of which took place at 31° 57.4046'S, 15° 48.7603'E, we completed a pair of shelf transects across the Benguela upwelling system and thence steamed back to Cape Town where we unloaded our gear for shipment home.
Chief scientistDeirdre A Byrne (University of Maine School of Marine Sciences)
Ocean/sea areas 
GeneralIndian Ocean
South East Atlantic Ocean (limit 20W)
Track chartsRRS Discovery D291B cruise track — d291b_05roscop4740trk.pdf (00 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 55
Description: Vertical.
Other physical oceanographic measurementsQuantity: number of profiles = 86
Description: Vertical.
Chemical oceanography 
OxygenQuantity: number of profiles = 43
Description: Vertical.
Moorings, landers, buoys 
Physical oceanography 
Current meters37° 24' 57" S  12° 32' 49" E —
Current meters33° 46' 19" S  14° 47' 17" E —
Current meters32° 39' 50" S  15° 25' 11" E —
Current meters34° 49' 10" S  14° 10' 14" E —
Other physical oceanographic measurements35° 25' 33" S  13° 48' 14" E —
Other physical oceanographic measurements34° 7' 25" S  14° 34' 59" E —
Other physical oceanographic measurements38° 42' 0" S  11° 41' 18" E —
Other physical oceanographic measurements38° 9' 27" S  12° 3' 21" E —
Other physical oceanographic measurements37° 7' 6" S  12° 44' 25" E —
Other physical oceanographic measurements35° 58' 29" S  13° 27' 55" E —
Other physical oceanographic measurements34° 49' 10" S  14° 10' 14" E —
Other physical oceanographic measurements33° 25' 12" S  14° 59' 28" E —
Other physical oceanographic measurements36° 34' 20" S  13° 5' 24" E —
Other physical oceanographic measurements37° 39' 48" S  12° 23' 4" E —
Other physical oceanographic measurements31° 57' 24" S  15° 48' 45" E —
Other physical oceanographic measurements39° 14' 26" S  11° 18' 53" E —
Other physical oceanographic measurements34° 49' 54" S  14° 9' 48" E —