RRS James Clark Ross JR19990211 (JR39b)
Cruise summary report
|Ship name (ship code)||RRS James Clark Ross (74JC)|
|Cruise identifier||JR19990211 (JR39b)|
|Cruise period||1999-02-11 — 1999-03-11|
|Port of departure||Stanley, Falkland Islands (Malvinas)|
|Port of return||Stanley, Falkland Islands (Malvinas)|
|Objectives||The objectives of the cruise were:
1. To image two anomalous ridge sediments, E2 and E9, the former exhibiting a 600m high, narrow, linear ridge known as the 'mermaid's purse', beneath which seismic profiling had previously demonstrated the process of a lens of melt.
2. To locate hydrothermal plumes on the ridge using optical sensors to detect particulates formed at seas floor vents and incorporated into rising plumes.
3. To determine whether a seismic low-velocity zone exists beneath E2, by recording airgun signals using ocean-bottom hydrophones.
4. To obtain representative rock samples on all ridge sediments (in conjunction with previous R/V Polarstern dredging).
|Chief scientist||Roy Livermore (British Antarctic Survey)|
|Cruise report||(5.93 MB)|
|General||South Atlantic Ocean|
|Subsurface temperature and salinity measurements||Description: A number of CTD casts were made throughout the cruise. No. of measurements not noted.|
|Current meters||Description: A number of CTD casts were made throughout the cruise. No. of measurements not noted.|
|Geology and geophysics|
|Core - soft bottom||Description: A number of cores were sampled throughout the cruise. No. of cores not noted.|
|Magnetic measurements||Description: A number of magnetometer deployments were made throughout the cruise. No. of deployments not noted.|