RRS James Clark Ross JR20131221 (JR284, JR292)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS James Clark Ross (74JC) |
| Cruise identifier | JR20131221 (JR284, JR292) |
| Cruise period | 2013-12-21 — 2014-01-01 |
| Status | Completed |
| Port of departure | Rothera, Antarctica |
| Port of return | Punta Arenas, Chile |
| Purpose | Research |
| Objectives | JR284: The primary aim of the cruise was to improve constraints on the deglacial history of the Antarctic Peninsula Ice Sheet. The data and samples collected will also be used in three Collaborative Gearing Scheme projects that are related to the primary cruise aim. These are:
- Constraints on ice-stream behaviour during retreat and deglacial chronology from geomorphology and seafloor sediments. - Spatial variations in grounding-line proximal facies. - Testing a refugia hypothesis on the Antarctic Peninsula continental shelf, with implications for biology and past ice-sheet extent. The cruise dovetailed with BAS logisitic activities, starting at Rothera Station after the JCR had made the first call of the season there. The data and samples collected on cruise JR284 will provide new constraints on the dynamic behaviour of the expanded ice sheet during the Last Glacial Maximum and on the subsequent history of glacial retreat. JR292: Annual cruise to recover and redeploy BPRs in northern and southern Drake Passage in support of the NERC National Capability project ACCLAIM. Tide gauges at Stanley, Rothera and British bases in the Weddell Sea (Signy Island) and Antarctic Peninsula (Vernadsky) are also serviced. |
| Chief scientist | Miguel Angel Morales Maqueda (National Oceanography Centre, Liverpool), Robert D Larter (British Antarctic Survey) |
| Project | ACCLAIM |
| Coordinating body | Natural Environment Research Council (NERC) |
| Cruise report |  (2.69 MB) |
| Ocean/sea areas | |
| General | Southern Ocean |
| Specific | Weddell Sea |
| Track charts | (0.97 MB) |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: activity duration in days = 13 Description: BAS oceanlogger, temperature, conductivity |
| Bathythermograph | Quantity: number of profiles = 2 Description: Expendable bathythermograph T7 probes |
| CTD stations | Quantity: number of stations = 2 Description: Seabird SBE9plus CTD including fluorometer, oxygen sensor, PAR sensor, transmissometer, altimeter and rosette of 24 x 12 l Niskin bottles |
| Meteorology | |
| Routine standard measurements | Quantity: activity duration in days = 13 Description: BAS oceanlogger, temperature, pressure, wind speed and direction |
| Geology and geophysics | |
| Core - soft bottom | Quantity: number of stations = 26 Description: Gravity cores up to 9 m in length |
| Core - soft bottom | Quantity: number of stations = 13 Description: Box cores |
| Single-beam echosounding | Quantity: activity duration in days = 13 Description: Kongsberg EA600, water depth and reflection amplitude |
| Multi-beam echosounding | Quantity: activity duration in days = 13 Description: Kongsberg EM122, water depth and backscatter amplitude |
| Magnetic measurements | Quantity: activity duration in days = 13 Description: BAS shipboard three-component magnetometer, x-y-z components of field |
| Other geological/geophysical measurements | Quantity: activity duration in days = 12 Description: TOPAS PS018 parametric sub-bottom profiler, reflection amplitude and travel time |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Other physical oceanographic measurements | 60° 49' 29" S 54° 43' 19" W — Bottom Pressure Recorder, Drake Passage South Deep, recovered from 1920 m. Pressure + temperature. |
| Other physical oceanographic measurements | 56° 2' 5" S 57° 57' 56" W — Bottom Pressure Recorder, Drake Passage North Deep, recovered from 2003 m. Pressure + temperature. |
| Other physical oceanographic measurements | 64° 14' 34" S 65° 28' 40" W — Bottom Pressure Recorder, FETCH trial, deployed to 587 m and recovered 6 days later. Pressure + temperature. |
| Other physical oceanographic measurements | 54° 58' 48" S 57° 59' 18" W — Bottom Pressure Recorder, Drake Passage North, deployed to 1097 m. Pressure + temperature + CTD (SBE37) |
| Other physical oceanographic measurements | 60° 51' 5" S 54° 43' 45" W — Bottom Pressure Recorder, Drake Passage South, deployed to 1080 m. Pressure + temperature + CTD (SBE37). |
| Other physical oceanographic measurements | 55° 2' 20" S 57° 56' 56" W — Bottom Pressure Recorder, Drake Passage North Deep, deployed to 2031 m. Pressure (DQ + SBE53) + temperature + CTD (SBE37) + sound speed (MIDAS SVP). |
