Cruise inventory

RRS Challenger CH4B/76

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH4B/76
Cruise period1976-03-18 — 1976-03-23
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeResearch
ObjectivesThis cruise aimed to undertake UOR (including calibration CTD profiles) and CPR surveying to determine pre-bloom conditions in the FLEX survey box (58.5-59.5N, 0-2E). Despite poor weather and a medical emergency curtailing the cruise an adequate picture of pre-bloom conditions was obtained.
Chief scientistRobert H Bruce (Institute of Marine Environmental Research, Plymouth)
ProjectJONSDAP 76
Cruise reportRRS Challenger CH4B/76 cruise report ch4b_76.pdf — access key 'C' (0.25 MB) 
Ocean/sea areas 
GeneralNorth Sea
Track chartsRRS Challenger CH4B/76 cruise track — trk1645.html
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of measurements = 500
Water bottle stationsQuantity: number of stations = 5
CTD stationsQuantity: number of stations = 5
Subsurface temperature and salinity measurementsQuantity: number of measurements = 400
Transparency (eg transmissometer)Quantity: number of stations = 5
Chemical oceanography 
PhosphateQuantity: number of stations = 5
NitrateQuantity: number of stations = 5
NitriteQuantity: number of stations = 5
SilicateQuantity: number of stations = 5
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 5
PhytoplanktonQuantity: number of stations = 5
ZooplanktonQuantity: track kilometres = 740.8
Description: cont. record. survey:distribution,population,energy transfers etc.
Meteorology 
Routine standard measurementsQuantity: number of observations = 15