Zanzibar (Tanzania) Site History
History Summary
| Station | Zanzibar |
|---|---|
| Latitude | 06° 09.3' S |
| Longitude | 039° 11.4' E |
| Country | Tanzania |
| GLOSS No. | 297 |
| Time Reference | GMT (hours 00-23) |
| Contributor | UH Sea Level Center in collaboration with Commission of Lands and Environment, Zanzibar |
| Instrument Type | Float type, R.W. Munro, London, I.H. 109 |
| Site of Gauge | The tide gauge is situated at the seaward end of the main jetty in Zanzibar harbour. |
| Observational Period | 1984 - present |
Reference Level
The sea level heights are referred to the zero point assigned to the tide staff.
Tide Gauge Benchmark (TGBM) Description
Old TGBM - about 30.0m from tide gauge (521209E, 9319992N)
Auxiliary Benchmarks
TGBM 1 is 3.709m above LSD
TGBM 2 is 3.750m above LSD
TGBM 3 is 3.925m above LSD
Benchmark Relationships
BM1 at Malindi roundabout = 3.80m above Land Survey Datum (1984, 1987)
Mean Sea Level is 2.08m above Chart Datum
Quality Assessment by the UH Sea Level Center
Comments
The daily and monthly means do not reveal any reference level shifts and agree fairly well with adjacent stations, Mombasa, Kenya and Dar Es Salaam, Tanzania.
Occasionally, timing errors were evident in the hourly data.
| Year | CI (%) | Missing Data | Replaced Gaps or Bad Data | Questionable Fluctuations |
|---|---|---|---|---|
| 1984 | 84 | None | (02)363-(08)363 | 79,230,281-282 |
| 1985 | 99 | 67-68,192-193 (20)164-(08)165 | 20,47,66-67,96,98, (05)294-(11)294 | 125-127,129,179 |
| 1986 | 100 | None | None | 25-27,31,193 |
| 1987 | 100 | None | None | 122-124,132-135, 180-181 |
| 1988 | 100 | None | None | 105,158-160, 240-242 |
| 1989 | 100 | None | None | 49-51,67-69, 82-84, 91-93, 314-316,349- 350 |
| 1990 | 95 | 208-226 | None | 96-100,140-150, 173- 175,227-230 282,309- 310,337-340 |
| 1991 | 100 | None | None | 1-3,89-92, 153,164- 165 |
| 1992 | 100 | None | None | None |
| 1993 | 98 | 8-16 | None | None |
| 1994 | 100 | None | None | None |
| 1995 | 100 | None | (13)184-(12)185 | None |
| 1996 | 100 | None | None | None |
| 1997 | 98 | 330-339 | None | None |
| 1998 | 99 | 329-330 | (21)203-(17)204 | None |
