RRS Discovery D21

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD21
Cruise period1968-01-14 — 1968-04-01
Port of departurePlymouth, United Kingdom
Port of returnPlymouth, United Kingdom

1. Continue investigations into the vertical distribution of zooplankton by a programme of day and night sampling with depth monitored opening/closing nets at a position far enough south to examine a fauna quite distinct from that examined at the Fuerteventura position.
2. Make observations at the Fuerteventura position at a different season of the year.
3. Try to discover the 'whereabouts of the faunal boundary between the 'southern' fauna and that found at Fuerteventura.
4. Make a preliminary survey of the upwelling regions of the NW African continental shelf to compare the vertical distribution of plankton in upwelling and nonupwelling areas.
Chief scientistPeter M David (National Institute of Oceanography)
Cruise reportRRS Discovery D21 cruise report d021.pdf (1.34 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificNorthwest African continental shelf
Track chartsRRS Discovery D21 cruise track — d021trk.pdf (0.04 MB)