Dakar-D (Senegal) Site History
History Summary
| Station name | Dakar-D |
|---|---|
| Country | Senegal |
| Latitude | 14° 40.0' N |
| Longitude | 017° 25.8' W |
| GLOSS No. | 253 |
| Time Reference | GMT (hours 00-23) |
| Contributor | 1986-1989 TOGA Sea Level Center |
| Instrument type | Aanderaa WLR5 (bottom-mounted pressure gauge) |
| Site Gauge | |
| Observational periods | 1982 - 1989 |
Reference Level
Due to the nature of the bottom-mounted pressure gauges, no link could be established between the zero of the gauge values and fixed points on land. Also, tide staff observations or the like were unavailable. This series has no long-term reference level.
Quality Assessment by the UH Sea Level Center
Comments
The depth of the instrument in the water was about 8 m. Techniques of data processing by the originator are discussed in the second reference below.
The Dakar pressure gauge records consist of four separate segments:
- Dakar-A: 24 December 1982 12 December 1983
- Dakar-B: 12 December 1983 09 January 1985
- Dakar-C: 30 May 1986 16 December 1986
- Dakar-D: 16 December 1986 24 May 1989
The series was broken into segments because level jumps could be identified at the time of instrument replacements.
Due to the tendency for pressure gauge sensors to drift, it is beneficial for investigators to know the time span of each instrument deployment (time/date as yyyy/mm/dd/hh(GMT)).
| Series | Start | Stop |
|---|---|---|
| Dakar-A | 1982/12/24/13 | 1983/01/25/10 |
| Dakar-A | 1983/01/25/12 | 1983/03/17/15 |
| Dakar-A | 1983/03/17/17 | 1983/05/16/10 |
| Dakar-A | 1983/05/16/11 | 1983/07/20/10 |
| Dakar-A | 1983/07/20/11 | 1983/12/12/10 |
| Dakar-B | 1983/12/12/11 | 1984/04/30/11 |
| Dakar-B | 1984/04/30/12 | 1984/10/04/11 |
| Dakar-B | 1984/10/04/12 | 1985/01/09/12 |
| Dakar-C | 1986/05/30/15 | 1986/12/16/15 |
| Dakar-D | 1986/12/16/23 | 1988/09/21/01 |
| Dakar-D | 1988/11/11/10 | 1989/05/24/10 |
References
Verstraete, J.M., 1988.
Sea level variations in the tropical Atlantic. Time series of ocean measurements, Technical series, UNESCO,4,33-47.
Verstraete, J.M., 1992.
Accuracy of shallow pressure gauges. Joint IAPSO-IOC Workshop on Sea Level Measurements and Quality Control, Paris, 12-13 October, 1992. IOC Workshop Report No. 81, UNESCO. pp. 70-76.
| Year | CI(%) | Missing Data | Replaced Gaps or Bad Data | Questionable Fluctuations |
|---|---|---|---|---|
| 1986 | 4 | none | none | none |
| 1987 | 100 | none | none | none |
| 1988 | 86 | 265-316 | (18)129-(06)130 (15)188-(01)189 (20)235-(19)236 | none |
| 1989 | 39 | none | none | none |
