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.