Tristan da Cunha - A Site History
History Summary
| Station Name | Tristan - A |
|---|---|
| Time Reference | GMT (00-23 Hours) |
| Units | dbars |
| Sample Interval | Hourly |
| Contributors | Proudman Oceanographic Laboratory,
Joseph Proudman Building, Liverpool. U.K. |
| Instrument Type | Paroscientific Digiquartz pressure transducer with temperature recorded. |
Instrument Positions
| Observational Period | Latitude | Longitude | Depth(m) |
|---|---|---|---|
| 06Nov1985 - 03Oct1986 | 35° 31.00' S | 011° 02.00' W | 4080 |
| 04Oct1986 - 26Sep1987 | 35° 31.00' S | 011° 02.00' W | 4082 |
| 27Sep1987 - 08Oct1988 | 35° 32.00' S | 011° 00.00' W | 4090 |
These data form part of the 'Tristan Triangle Experiment' around Tristan da Cunha which consisted of a series of Bottom Pressure Recorder measurements made in a 'triangle' (sites A, B and C) around the island between 1985-88. (Spencer et al.)
Bottom pressure at all three sites was found to be coherent. (Hughes and Smithson (1996))
Quality Assessment
Mean and Long-term drift has been removed from the data. Depths given are approximate.
| Period | Comments |
|---|---|
| Nov 1985 -Oct 1986 | Pressure channels 1 and 2 appear to be the most accurate.
Pressure channel 3 marked: 1986 104-112 |
| Oct 1986 - Sep 1987 | Contributors recommend use of pressure channel 2.
Pressure channel 3 marked: 1986 277-280 |
| Sep 1987 - Oct 1988 | All pressure channels are fine. |
References
Spencer, R. et al.
The ACCLAIM programme in the South Atlantic and Southern Oceans. International Hydrographic Review, 70, 7-21.
Hughes, C.W. and Smithson, M.J. 1996.
Bottom pressure correlations in the South Atlantic. Geophysical Research Letters, 23(17), 2243-2246.
