Cruise inventory

RRS James Cook JC112

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Cook (740H)
Cruise identifierJC112
Cruise period2014-12-05 — 2015-01-16
StatusCompleted
Port of departureBalboa, Panama
Port of returnCaldera, Costa Rica
PurposeResearch
ObjectivesThe cruise JC112 is the first leg of the fieldwork to be completed for the OSCAR project. The aim of OSCAR is to
1. characterise how heat from the interior of the Earth is transported across the crust into the ocean by hydrothermal flows
2. determine the impact the hydrothermal and geothermal fluxes have on the circulation of the abyssal ocean.

OSCAR has a geology component, led by Durham University and mainly dealing with item 1 above, and an oceanography one, focusing on item 2 and led by NOC. JC112 was prominently designed to serve the oceanographic component of the OSCAR programme, although it also included the deployment of magnetotelluric (MT) landers (GEOMAR, Kiel) and was carried out concurrently with cruise JC113, led by the University of Oregon, and focusing on measuring heat flow through sediment ponds on the ocean floor.

The activities specifically related to JC112 were:
1. Deployment of 3 long hydrographic moorings, two of them with a bottom pressure recorder (BPR) at the base.
2. Deployment of 1 BPR lander
3. Deployment of 2 short ADCP moorings.
4. Deployment of 12 MT landers.
5. Completion of 66 CTD/VMP (Conductivity, Temperature, Depth/Vertical Microstructure Profiling) stations with salinity, Oxygen and Helium sampling.
6. Completion of 2 24-hour deep CTD surveys of an area over the Costa Rica Rift without sampling or VMP casting.
7. Completion of 48 zooplankton sampling stations (typically immediately before or after a CTD cast).
8. Underway measurement of surface T & S, vertical current profiles (with hull-mounted ADCPs) and marine meteorology)

In addition to NOC, Durham and University of Oregon scientists and technicians, the cruise benefitted from the participation of scientists from the Universidad de Costa Rica, and Instituto Oceanografico de la Armada de Ecuador.
Chief scientistMiguel Angel Morales Maqueda (National Oceanography Centre, Liverpool)
ProjectOSCAR
Coordinating bodyDurham University
Ocean/sea areas 
GeneralNorth East Pacific Ocean (limit 180W)
SpecificCosta Rica Rift, Panama Basin
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 42
Description: Surface T & S. Continuous measurement + daily salinity samples (1 bottle)
CTD stationsQuantity: number of stations = 66
Description: Standard, surface-to-bottom CTD casts, including Oxygen and Lowered ADCP measurements. Twenty four-bottle sampling of salinity and Oxygen at each station (except for station 001, with no Oxygen, and stations 083 to 086, with no salinity. He sampling was carried out at selected stations.
Current profiler (eg ADCP)Quantity: activity duration in days = 42
Description: Continuous measurement with hull mounted ADCP (raw data)
Instrumented wave measurementsQuantity: activity duration in days = 42
Description: Continuous measurement with WAMOS system (raw data)
Chemical oceanography 
OxygenQuantity: number of stations = 66
Description: Standard, surface-to-bottom CTD casts, including Oxygen and Lowered ADCP measurements. Twenty four-bottle sampling of salinity and Oxygen at each station (except for station 001, with no Oxygen, and stations 083 to 086, with no salinity. He sampling was carried out at selected stations.
Trace elementsQuantity: number of samples = 419
Description: Helium sampling. Each sample contained in a 1 cm x 30 cm sealed copper cylinder.
Biology and fisheries 
ZooplanktonQuantity: number of samples = 48
Description: Vertical net cast to 100 m.
Geology and geophysics 
Multi-beam echosoundingQuantity: activity duration in days = 42
Description: Continuous swath echosounding save during mooring and CTD stations, and seismics
Moorings, landers, buoys 
Physical oceanography 
Current meters0° 52' 59" N  83° 46' 59" W — Mooring M3. Depth: 3384 m, 11/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs, 1 SBE53 Bottom Pressure Recorder (BPR).
Current meters3° 19' 59" N  83° 32' 59" W — Mooring M1. Depth: 3349 m, 09/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs, 1 SBE53 Bottom Pressure Recorder (BPR).
Current meters2° 0' 0" N  83° 42' 0" W — Mooring M2. Depth: 3355 m, 10/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs.
Current profiler (eg ADCP)1° 0' 0" S  86° 0' 0" W — Mooring ADCP 300kHz. Depth: 2243 m, 12/12/2014 (deployment only) 1 TRDI 300kHz Work Horse Sentinel ADCP, 1 SBE37 SMP CTD.
Current profiler (eg ADCP)1° 0' 0" S  85° 15' 0" W — Mooring ADCP 75kHz. Depth: 2300 m, 12/12/2014 (deployment only) 1 TRDI 75kHz Long Ranger ADCP, 1 SBE37 SMP CTD.
Sea level (inc. bot. press., inverted echosounder)0° 52' 59" N  83° 46' 59" W — Mooring M3. Depth: 3384 m, 11/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs, 1 SBE53 Bottom Pressure Recorder (BPR).
Sea level (inc. bot. press., inverted echosounder)2° 1' 59" N  83° 40' 0" W — RAPID Lander. Depth: 3330 m, 18/12/2014 (deployment only) 1 RAPID Lander BPR.
Sea level (inc. bot. press., inverted echosounder)3° 19' 59" N  83° 32' 59" W — Mooring M1. Depth: 3349 m, 09/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs, 1 SBE53 Bottom Pressure Recorder (BPR).
Other physical oceanographic measurements2° 0' 0" N  83° 42' 0" W — Mooring M2. Depth: 3355 m, 10/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs.
Other physical oceanographic measurements1° 0' 0" S  85° 15' 0" W — Mooring ADCP 75kHz. Depth: 2300 m, 12/12/2014 (deployment only) 1 TRDI 75kHz Long Ranger ADCP, 1 SBE37 SMP CTD.
Other physical oceanographic measurements0° 52' 59" N  83° 46' 59" W — Mooring M3. Depth: 3384 m, 11/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs, 1 SBE53 Bottom Pressure Recorder (BPR).
Other physical oceanographic measurements1° 0' 0" S  86° 0' 0" W — Mooring ADCP 300kHz. Depth: 2243 m, 12/12/2014 (deployment only) 1 TRDI 300kHz Work Horse Sentinel ADCP, 1 SBE37 SMP CTD.
Other physical oceanographic measurements3° 19' 59" N  83° 32' 59" W — Mooring M1. Depth: 3349 m, 09/12/2014 (deployment only). 3 Nortek Aquadopp current meters, 6 SBE37 SMP CTD microCaTs, 1 SBE53 Bottom Pressure Recorder (BPR).
Geology and geophysics 
Geophysical measurements made at depth1° 15' 0" N  83° 43' 59" W — Magnetotelluric Lander MT02. Depth: 3453, 10/12/2014 (deployment only).
Geophysical measurements made at depth1° 55' 0" N  83° 46' 0" W — Magnetotelluric Lander MT03. Depth: 3491, 10/12/2014 (deployment only).
Geophysical measurements made at depth1° 10' 0" N  83° 43' 59" W — Magnetotelluric Lander MT01. Depth: 3465, 10/12/2014 (deployment only).
Geophysical measurements made at depth3° 4' 0" N  83° 49' 0" W — Magnetotelluric Lander MT07. Depth: 2924, 10/12/2014 (deployment only).
Geophysical measurements made at depth2° 19' 0" N  83° 46' 59" W — Magnetotelluric Lander MT04. Depth: 3350, 10/12/2014 (deployment only).
Geophysical measurements made at depth3° 10' 0" N  83° 49' 0" W — Magnetotelluric Lander MT08. Depth: 2987, 10/12/2014 (deployment only).
Geophysical measurements made at depth2° 40' 59" N  83° 47' 59" W — Magnetotelluric Lander MT05. Depth: 3189, 10/12/2014 (deployment only).
Geophysical measurements made at depth2° 55' 59" N  83° 47' 59" W — Magnetotelluric Lander MT06. Depth: 3012, 10/12/2014 (deployment only).
Geophysical measurements made at depth3° 16' 0" N  83° 49' 0" W — Magnetotelluric Lander MT09. Depth: 2771, 09/12/2014 (deployment only).
Geophysical measurements made at depth3° 15' 0" N  83° 49' 59" W — Magnetotelluric Lander MT10. Depth: 2872, 09/12/2014 (deployment only).
Geophysical measurements made at depth3° 21' 0" N  83° 49' 59" W — Magnetotelluric Lander MT11. Depth: 2934, 09/12/2014 (deployment only).
Geophysical measurements made at depth3° 25' 59" N  83° 49' 59" W — Magnetotelluric Lander MT12. Depth: 2813, 09/12/2014 (deployment only).
Magnetic measurements3° 21' 0" N  83° 49' 59" W — Magnetotelluric Lander MT11. Depth: 2934, 09/12/2014 (deployment only).
Magnetic measurements2° 55' 59" N  83° 47' 59" W — Magnetotelluric Lander MT06. Depth: 3012, 10/12/2014 (deployment only).
Magnetic measurements3° 15' 0" N  83° 49' 59" W — Magnetotelluric Lander MT10. Depth: 2872, 09/12/2014 (deployment only).
Magnetic measurements2° 19' 0" N  83° 46' 59" W — Magnetotelluric Lander MT04. Depth: 3350, 10/12/2014 (deployment only).
Magnetic measurements3° 16' 0" N  83° 49' 0" W — Magnetotelluric Lander MT09. Depth: 2771, 09/12/2014 (deployment only).
Magnetic measurements1° 15' 0" N  83° 43' 59" W — Magnetotelluric Lander MT02. Depth: 3453, 10/12/2014 (deployment only).
Magnetic measurements3° 25' 59" N  83° 49' 59" W — Magnetotelluric Lander MT12. Depth: 2813, 09/12/2014 (deployment only).
Magnetic measurements3° 10' 0" N  83° 49' 0" W — Magnetotelluric Lander MT08. Depth: 2987, 10/12/2014 (deployment only).
Magnetic measurements3° 4' 0" N  83° 49' 0" W — Magnetotelluric Lander MT07. Depth: 2924, 10/12/2014 (deployment only).
Magnetic measurements1° 10' 0" N  83° 43' 59" W — Magnetotelluric Lander MT01. Depth: 3465, 10/12/2014 (deployment only).
Magnetic measurements1° 55' 0" N  83° 46' 0" W — Magnetotelluric Lander MT03. Depth: 3491, 10/12/2014 (deployment only).
Magnetic measurements2° 40' 59" N  83° 47' 59" W — Magnetotelluric Lander MT05. Depth: 3189, 10/12/2014 (deployment only).