RRS James Clark Ross JR20140331 (JR272C, JR273B, JR293 Leg2, JR299 Leg2, UKD-5)
Cruise summary report
|Ship name (ship code)||RRS James Clark Ross (74JC)|
|Cruise identifier||JR20140331 (JR272C, JR273B, JR293 Leg2, JR299 Leg2, UKD-5)|
|Cruise period||2014-03-31 — 2014-04-29|
|Port of departure||Punta Arenas, Chile|
|Port of return||Stanley, Falkland Islands (Malvinas)|
|Objectives||The voyage JR299 on the RRS James Clark Ross was an amalgamation of the following cruises: JR293, JR272C and JR273B. It also included a three day extension in which to turn around two Lamont-Doherty Earth Observatory (LDEO) moorings in the Weddell Sea. JR299 also represents the final voyage of the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) project that began in 2009. The major field work component of DIMES consisting of five voyages by US collaborators and five (and a half) UK led voyages investigating the spread of a chemical tracer dye release through Drake Passage and other observations of internal ocean mixing in the South East Pacific and Scotia Sea. Because of this JR299 is also designated DIMES UK5.
The second leg was conducted from Punta Arenas (31st March) to Stanley (27th April) in the Falkland Islands. Four CTD stations were occupied on the northern end of SR1b, missed on the first leg due to poor weather, before the ship proceeded south to the Weddell Sea to turn around the LDEO moorings. One was recovered while the second could not be due to ice, but its replacement was deployed nearby. The ship then steamed to the southern end of the JR272C leg (repeat CTD section A23). The southernmost CTD stations were inaccessible due to heavy sea ice, but the remainder of the section north to South Georgia was completed. This section was slightly different to previous occupations of A23 in that CTD stations were shifted by small amounts so as to sample the deepest bathymetry in the region. Upon reaching South Georgia the ship occupied CTD stations following the North Scotia Ridge westward (JR273B) to Stanley. This leg included a diversion northward into the Argentine Basin in order to repeat CTD stations occupied the previous year as part of the DIMES tracer release experiment.
A23 Transect (JR272C): A repeat CTD section that runs from the northern Weddell Sea, northward across the Scotia Sea (including doglegs), up to South Georgia, 23 stations. Stations south of 62.5 S missed due to sea ice.
North Scotia Ridge (JR273B): 34 CTD stations along the ridge crest of the North Scotia Ridge.
|Chief scientist||Andrew J S Meijers (British Antarctic Survey)|
|Project||Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean|
|Cruise report||(6.24 MB)|
|General||South West Atlantic Ocean (limit 20W)|
|Specific||Drake Passage, Weddell Sea, Scotia Sea, Argentine Basin|
|Track charts||(00 MB)|
|Data held at BODC|
|86 CTD frame plus rosette sampler||Stable isotope enrichment in the water column|
Water body released tracers
Silicate concentration parameters in the water column
Alkalinity, acidity and pH of the water column
Salinity of the water column
Total dissolved inorganic carbon (TCO2) concentration in the water column
Nitrate concentration parameters in the water column
Phosphate concentration parameters in the water column