Cruise inventory

Sonne SO238

Cruise summary report

Cruise Info. 
Ship name (ship code)Sonne (06SN)
Cruise identifierSO238
Cruise period2015-02-06 — 2015-03-06
StatusCompleted
Port of departureBalboa, Panama
Port of returnBalboa, Panama
PurposeResearch
ObjectivesThe cooling of young oceanic crust is the main physical process responsible for removing heat from the solid Earth to the hydrosphere. Close to the mid-ocean ridges, rapid cooling is dominated by hydrothermal circulation of seawater through the porous and fractured basalt crust. This hydrothermal fluid is then discharged into the ocean mainly along the ridges. The cruise SO238 is part of an interdisciplinary project to investigate the effects of this heat loss and hydrothermal circulation in both the solid Earth and the ocean. The data collected during the cruise will allow us to derive an integrated model which will be constrained by geophysical, geological and physical oceanography data that includes pathways in both the solid Earth and the ocean including fluxes through the seabed.

The cruise was divided into three stages. During the first part of the cruise, a 2-ship synthetic aperture multichannel seismic reflection survey over three 270-km transects was carried out to map the evolution of crust structure, properties and morphology along the southern flank of the Costa Rica Ridge. The lead ship for this work was RRS James Cook, with FS Sonne trailing 9 km behind. In the second part of the cruise, we recovered a line of three moorings equipped with current meters, CTD (Conductivity, Temperature, Depth) sensors, bottom pressure recorders (BPRs) and 12 magnetotelluric landers that were deployed in December 2014 from RRS James Cook (cruise JC112). In the final part of the cruise, we deployed an ADCP mooring for 24 hours to monitor flows across the Ecuador Trench, southeast of the Costa Rica Ridge and, subsequently, carried out a series of ~40 CTDs in the eastern half of the Panama Basin.Swath bathymetry was collected throughout the cruise.
Chief scientistMiguel Angel Morales Maqueda (National Oceanography Centre, Liverpool)
ProjectOSCAR
Coordinating bodyNatural Environment Research Council (NERC)
Cruise reportSonne SO238 cruise report sonne_so238.pdf — access key 'C' (7.99 MB) 
Ocean/sea areas 
GeneralNorth East Pacific Ocean (limit 180W)
SpecificPanama Basin
Track chartsSonne SO238 cruise track — sonne_so238trk.pdf (00 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of samples = 24
Description: Surface T & S. Continuous measurement + daily salinity samples (1 bottle)
CTD stationsQuantity: number of stations = 43
Description: CTD + Oxygen + Turbidity + Sound speed + salinity sampling (24 bt) + sporadic He sampling
Geochemical tracers (eg freons)Quantity: number of stations = 43
Description: CTD + Oxygen + Turbidity + Sound speed + salinity sampling (24 bt) + sporadic He sampling
Current profiler (eg ADCP)Quantity: activity duration in days = 24
Description: Continuous measurement with hull mounted ADCP (raw data)
Instrumented wave measurementsQuantity: activity duration in days = 24
Description: Continuous measurement with WAMOS system (raw data)
Other physical oceanographic measurementsQuantity: activity duration in days = 24
Description: Water column acoustic profiling with Parasound sub-bottom profiler system
Meteorology 
Routine standard measurementsQuantity: activity duration in days = 24
Description: Routine air T, Q, W, insolation
Geology and geophysics 
Multi-beam echosoundingQuantity: activity duration in days = 24
Description: Continuous swath echosounding save during mooring and CTD stations, and seismics
Multichannel seismic reflectionQuantity: number of profiles = 3
Description: Synthetic aperture multichannel seismic reflection with James Cook.
Moorings, landers, buoys 
Physical oceanography 
Current profiler (eg ADCP)0° 19' 0" S  81° 7' 59" W — Bottom mounted ADCP with CTD ADCP-Ecuador Trench
Current profiler (eg ADCP)1° 0' 0" S  85° 16' 59" W — Bottom mounted ADCP with CTD ADCP-West
Current profiler (eg ADCP)1° 0' 0" S  86° 0' 0" W — Bottom mounted ADCP with CTD ADCP-East
Sea level (inc. bot. press., inverted echosounder)2° 1' 0" N  83° 40' 59" W — Bottom pressure recorder
Other physical oceanographic measurements2° 0' 0" N  83° 42' 0" W — Combined CTD (5) and point current meters (3) M2
Other physical oceanographic measurements0° 52' 59" N  83° 46' 59" W — Combined CTD (5), point current meters (3) and bottom pressure (1) M3
Other physical oceanographic measurements3° 19' 59" N  83° 32' 59" W — Combined CTD (5), point current meters (3) and bottom pressure (1) M1
Geology and geophysics 
Magnetic measurements1° 19' 59" N  83° 43' 59" W — Magnetotelluric lander MT02
Magnetic measurements1° 16' 0" N  83° 45' 0" W — Magnetotelluric lander MT01
Magnetic measurements3° 25' 0" N  83° 50' 59" W — Magnetotelluric lander MT11
Magnetic measurements3° 25' 0" N  83° 50' 59" W — Magnetotelluric lander MT12
Magnetic measurements2° 46' 0" N  83° 49' 59" W — Magnetotelluric lander MT05
Magnetic measurements3° 1' 0" N  83° 49' 0" W — Magnetotelluric lander MT06
Magnetic measurements3° 4' 0" N  83° 49' 0" W — Magnetotelluric lander MT07 not recovered
Magnetic measurements3° 21' 0" N  83° 49' 59" W — Magnetotelluric lander MT10
Magnetic measurements3° 4' 59" N  83° 49' 59" W — Magnetotelluric lander MT08
Magnetic measurements1° 57' 0" N  83° 43' 59" W — Magnetotelluric lander MT03
Magnetic measurements2° 22' 59" N  83° 49' 0" W — Magnetotelluric lander MT04
Magnetic measurements3° 17' 59" N  83° 49' 59" W — Magnetotelluric lander MT09