Gibraltar Site History
History Summary
| Station name | Gibraltar |
|---|---|
| Country | United Kingdom |
| GLOSS No. | 248 |
| Contributor | (1961-1996) Hydrographic Office, Ministry of Defence, Taunton, Somerset |
| Instrument type | (1961-1996) Float and stilling well gauge A replacement gauge started operating in Nov 1994 |
| Site of Gauge | The tide gauge is situated in Gibraltar harbour at the north end of the main wharf. |
| Observational periods | 1961-1990,1993-2000 |
Reference Level
All heights have been referred to the station tide gauge zero which is linked to fixed bench marks
Benchmarks
| Benchmark | Description |
|---|---|
| TGBM | Top of coping north of tide gauge hut. |
| BM '18' (Auxilliary) | On SW face of main dockyard wall, North Jumper's Bastion. (Grid reference TF 8835 0123) |
Benchmark Relationships
Tide Gauge Zero (TGZ) set to Admiralty Chart Datum which is 3.20m below TGBM (1984 onwards).
Quality Assessment
Comment
The timing of the gauge appears to be off by a fraction of an hour in some instances. Most questionable fluctuations are related to timing errors.
Chart reading errors and spikes >10cm have been flagged.
Possible datum shift of -26cm on 1st January 1965.
Possible change of datum between August 1979 and December 1979, Jun 1990 and Mar 1993.
| Year | Completeness Index (%) | Questionable Fluctuations (In day Nos.) and Missing Data (Gaps > 6 hours) |
|---|---|---|
| 1961 | 41 | 242,274,280 |
| Gap from 1961/08/11 at 12.00 to 1961/08/11 at 23.00 | ||
| Gap from 1961/09/01 at 00.00 to 1961/09/30 at 23.00 | ||
| Gap from 1961/10/01 at 08.00 to 1961/10/02 at 06.00 | ||
| 1962 | 100 | 76-77,84-85,104-106,145,329,282-312 |
| 1963 | 99 | 2,25-26,37-38,44,112,186,208-209,352,361-364 |
| Gap from 1963/01/02 at 06.00 to 1963/01/04 at 12.00 | ||
| 1964 | 100 | 3,63,231-232,362 |
| 1965 | 98 | 57-60,184 |
| Gap from 1965/01/23 at 12.00 to 1965/01/23 at 23.00 | ||
| Gap from 1965/05/14 at 12.00 to 1965/05/14 at 23.00 | ||
| Gap from 1965/07/25 at 12.00 to 1965/07/25 at 23.00 | ||
| Gap from 1965/10/04 at 12.00 to 1965/10/04 at 23.00 | ||
| Gap from 1965/12/16 at 19.00 to 1965/12/17 at 06.00 | ||
| 1966 | 99 | None |
| Gap from 1966/04/30 at 12.00 to 1966/04/30 at 23.00 | ||
| Gap from 1966/07/19 at 12.00 to 1966/07/22 at 23.00 | ||
| 1967 | 100 | 7,333-335,345 |
| 1968 | 100 | None |
| 1969 | 100 | 240-241,313 |
| 1970 | 100 | 144 |
| 1971 | 100 | 2-3 |
| 1972 | 99 | 292-294,330-331 |
| Gap from 1972/06/26 at 08.00 to 1972/06/27 at 10.00 | ||
| 1973 | 100 | None |
| 1974 | 62 | None |
| Gap from 1974/08/15 at 21.00 to 1974/08/16 at 06.00 | ||
| Gap from 1974/08/30 at 08.00 to 1974/09/03 at 06.00 | ||
| Gap from 1974/09/16 at 08.00 to 1974/09/21 at 06.00 | ||
| 1975 | 99 | 214-215,228-231,235-242 |
| Gap from 1975/01/18 at 08.00 to 1975/01/20 at 07.00 | ||
| 1976 | 99 | 80-81,91-92,108-110 |
| Gap from 1976/04/02 at 09.00 to 1976/04/03 at 06.00 | ||
| Gap from 1976/04/26 at 08.00 to 1976/04/30 at 06.00 | ||
| 1977 | 99 | 180-181 |
| Gap from 1977/05/08 at 15.00 to 1977/05/09 at 10.00 | ||
| Gap from 1977/10/12 at 12.00 to 1977/10/12 at 23.00 | ||
| Gap from 1977/10/13 at 14.00 to 1977/10/14 at 05.00 | ||
| 1978 | 99 | None |
| Gap from 1978/03/02 at 15.00 to 1978/03/03 at 06.00 | ||
| Gap from 1978/09/19 at 12.00 to 1978/09/19 at 23.00 | ||
| Gap from 1978/10/27 at 23.00 to 1978/10/30 at 06.00 | ||
| 1979 | 66 | None |
| Gap from 1979/04/01 at 00.00 to 1979/04/02 at 06.00 | ||
| Gap from 1979/05/08 at 07.00 to 1979/05/09 at 06.00 | ||
| Gap from 1979/05/12 at 08.00 to 1979/05/13 at 07.00 | ||
| Gap from 1979/05/25 at 12.00 to 1979/05/26 at 06.00 | ||
| Gap from 1979/05/31 at 21.00 to 1979/06/01 at 06.00 | ||
| Gap from 1979/08/12 at 12.00 to 1979/12/10 at 06.00 | ||
| 1980 | 99 | None |
| Gap from 1980/04/06 at 00.00 to 1980/04/07 at 08.00 | ||
| Gap from 1980/05/14 at 00.00 to 1980/05/14 at 07.00 | ||
| Gap from 1980/09/17 at 12.00 to 1980/09/17 at 23.00 | ||
| 1981 | 98 | 313-317 |
| Gap from 1981/01/29 at 12.00 to 1981/01/29 at 23.00 | ||
| Gap from 1981/03/09 at 12.00 to 1981/03/09 at 23.00 | ||
| Gap from 1981/03/15 at 00.00 to 1981/03/16 at 11.00 | ||
| Gap from 1981/08/19 at 12.00 to 1981/08/19 at 23.00 | ||
| Gap from 1981/10/04 at 00.00 to 1981/10/05 at 06.00 | ||
| Gap from 1981/10/26 at 16.00 to 1981/10/27 at 06.00 | ||
| Gap from 1981/12/19 at 12.00 to 1981/12/19 at 21.00 | ||
| 1982 | 99 | 38 |
| Gap from 1982/02/07 at 19.00 to 1982/02/08 at 06.00 | ||
| Gap from 1982/04/29 at 00.00 to 1982/04/29 at 06.00 | ||
| 1983 | 99 | None |
| Gap from 1983/03/14 at 19.00 to 1983/03/15 at 07.00 | ||
| 1984 | 99 | None |
| Gap from 1984/01/04 at 21.00 to 1984/01/05 at 07.00 | ||
| 1985 | 81 | 95-97,162-165, timing questionable from 252 onwards |
| Gap from 1985/03/04 at 09.00 to 1985/03/14 at 14.00 | ||
| Gap from 1985/09/08 at 14.00 to 1985/09/09 at 07.00 | ||
| Gap from 1985/10/04 at 16.00 to 1985/10/05 at 08.00 | ||
| Gap from 1985/10/06 at 09.00 to 1985/10/07 at 07.00 | ||
| Gap from 1985/10/13 at 00.00 to 1985/10/13 at 16.00 | ||
| Gap from 1985/10/14 at 00.00 to 1985/10/14 at 06.00 | ||
| Gap from 1985/10/27 at 10.00 to 1985/10/28 at 06.00 | ||
| Gap from 1985/10/29 at 16.00 to 1985/10/30 at 06.00 | ||
| Gap from 1985/11/01 at 00.00 to 1985/11/01 at 08.00 | ||
| Gap from 1985/11/03 at 09.00 to 1985/11/04 at 06.00 | ||
| Gap from 1985/11/07 at 08.00 to 1985/11/09 at 06.00 | ||
| Gap from 1985/11/10 at 08.00 to 1985/11/11 at 06.00 | ||
| Gap from 1985/11/14 at 16.00 to 1985/11/15 at 08.00 | ||
| Gap from 1985/11/15 at 15.00 to 1985/11/15 at 23.00 | ||
| 1986 | 67 | None |
| 1987 | 32 | 264-266,306-313 |
| Gap from 1987/10/25 at 23.00 to 1987/10/26 at 06.00 | ||
| Gap from 1987/10/27 at 11.00 to 1987/10/30 at 06.00 | ||
| 1988 | 95 | 95-97 |
| Gap from 1988/01/02 at 08.00 to 1988/01/06 at 06.00 | ||
| Gap from 1988/02/26 at 09.00 to 1988/02/29 at 06.00 | ||
| Gap from 1988/03/07 at 14.00 to 1988/03/15 at 06.00 | ||
| Gap from 1988/03/31 at 23.00 to 1988/04/04 at 18.00 | ||
| 1989 | 98 | None |
| Gap from 1989/10/20 at 15.00 to 1989/10/23 at 06.00 | ||
| Gap from 1989/12/11 at 08.00 to 1989/12/16 at 09.00 | ||
| 1990 | 42 | 116 |
| Gap from 1990/01/29 at 00.00 to 1990/01/29 at 09.00 | ||
| Gap from 1990/04/07 at 13.00 to 1990/04/07 at 19.00 | ||
| 1993 | 68 | 114-115,296-334 |
| 1994 | 11 | None |
| 1995 | 100 | See comment above |
| 1996 | 100 | None |
| 1997 | 84 | 248,284-287 |
| Gap from 1997/11/06 at 00.00 to 1997/12/31 at 23.00 | ||
| 1998 | 39 | Gap from 1998/01/01 at 00.00 to 1998/01/05 at 06.00 |
| Gap from 1998/05/27 at 08.00 to 1998/12/31 at 23.00 | ||
| Severe timing error throughout year. Data deemed u/s | ||
| 1999 | 54 | GAP GROM 1999/01/01 at 00.00 to 1999/04/05 at 09.00 |
| Gap from 1998/09/21 at 10.00 to 1999/12/31 at 23.00 | ||
| Severe timing error throughout year. Data deemed u/s | ||
| 2000 | 5 | Gap from 2000/01/01 at 00.00 to 2000/04/05 at 09.00 |
| Gap from 2000/05/01 at 00.00 to 2000/12/31 at 23.00 | ||
| Severe timing error throughout year. Data deemed u/s |
