Conductivity Temperature Depth (CTD) profilers - JR294
Description
109 CTD stations were occupied during cruise JR294 :
- Stations 1 and 2 were test stations: station 1 had communication problems which meant no bottles were fired, no upcast data was recorded, and a retermination was required after the cast. So station 2 was a repeat (and successful) test station.
- Stations 3 to 36 were occupied during our steam in along the eastern trough, and stations 51 and 60 filled in locations along that line which we had missed due to lack of time and inclement weather respectively.
- Stations 37 to 45 were along the ice front of Pine Island Glacier. Due to concerns over the CTD wire, station 48 was done primarily for purposes of examining the wire, and after that CTD, approximately 900 m of the wire was chopped off and reterminated.
- Stations 49 and 50 were before/after the deployment of the MVP along the Pine Island ice front, for inter-calibration purposes. Stations 52 to 58 and 62 to 72 were along the front of Thwaites Glacier. Stations.
- 74 to 109 were at the shelf break – 74 to 99 in the central trough and 100 to 109 in the eastern trough.
- Stations 25, 27, 50, 59,! 23 73, 78, 80, 83, 85, 97 and 106 were at mooring locations – either recoveries or deployments (see mooring information in Table 10.1).
- For station 87 only, the primary sensors – T, C and oxygen – were taken out and replaced by Autosub sensors. This is so the Autosub data can be calibrated.
- Stations 31, 46, 47 and 61 were VMP only stations – no CTD. Table 2.3 lists the stations, and figure 2.1 shows their locations.
Each CTD cast acquired measurements from two Seabird CTDs and a dissolved oxygen sensor, beam transmissometer, fluorometer, PAR sensor, altimeter and 24x10 litre bottle rosette.
References
1. Biddle, Louise (2016) Identifying Glacial Meltwater in the Amundsen Sea. Doctoral thesis, University of East Anglia. Available here
2. Heywood, K.J., L.C. Biddle, L. Boehme, P. Dutrieux, M. Fedak, A. Jenkins, R.W. Jones, J. Kaiser, H. Mallett, A.C. Naveira Garabato, I.A. Renfrew, D.P. Stevens, and B.G.M. Webber. 2016. Between the devil and the deep blue sea: The role of the Amundsen Sea continental shelf in exchanges between ocean and ice shelves. Oceanography 29(4):118–129,. Available here
4. BODC iSTAR project metadata
5. iSTAR - Data from research cruise analysed
Field photo
The CTD (conductivity-temperature-depth profiler) being deployed near Pine Island Glacier during JR294/295. Povl Abrahamsen, BAS