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RRS Challenger CH7/79

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH7/79
Cruise period1979-05-10 — 1979-05-23
StatusCompleted
Port of departureArdrossan, United Kingdom
Port of returnArdrossan, United Kingdom
PurposeResearch
ObjectivesThe objectives of this cruise were:
(1) Service the current meter mooring at 57N, 9W and deploy moorings at three stations on the Rockall via Anton Dohrn Seamount section. Accomplished, but one recovered current meter has failed due to leakage.
(2) Service IOS moorings in the Rockall Channel. Two of four moorings were recovered.
(3) Work the Rockall via Anton Dohrn Seamount (Ellett Line) CTD section. Only part of the section from the seamount eastwards could be worked due to time lost through mooring recovery problems.
(4) Work additional CTD sections in the northern Rockall Channel. A section across the Cirolana Deep was started but not finished due to technical problems with the CTD.
(5) Collect large-volume surface water sample for radiocaesium analysis from Scottish shelf stations. Accomplished with CTD profiles on all but one station.
(6) Obtain epibenthic sled samples at the SMBA permanent station (54° 40 min N, 12° 16 min W). Not possible due to poor weather and time lost through mooring recovery problems.
(7) Obtain deep plankton samples at the SMBA permanent section using the rectangular mid-water trawl. Not possible due to poor weather and time lost through mooring recovery problems.
(8) Obtain Assagiz trawl samples between the Anton Dohrn Seamount and the St Kilda continental slope. One good sample was obtained.
Chief scientistDavid J Ellett (Scottish Marine Biological Association)
Cruise reportRRS Challenger CH7/79 cruise report ch7_79.pdf (0.26 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Challenger CH7/79 cruise track — trk2342.html
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 40
Description: S surface only
CTD stationsQuantity: number of stations = 22
Description: salinity noisy
Current metersQuantity: number of stations = 4
Description: numbers of meters on the 4 SMBA stations are 4,4,4 and 2, respectively
Current metersQuantity: number of stations = 5
Chemical oceanography 
RadioactivityQuantity: number of samples = 10
Description: water samples for radio-caesium monitoring.
Biology and fisheries 
ZoobenthosQuantity: number of hauls = 1
Description: agassiz trawl haul.